Get help on our basic JavaScript and Algorithms Challenges. If you are posting code that is large use Gist - https://gist.github.com/ paste the link here.
@caleb272 You have a wrong query string: action:random should be action=random
@caleb272 But this action is unknown by the wiki anyway. I don't know the right actions and whatsoever, i have just seen a wrong query string :D
Hey all... I'm working on the titleCase bonfire... breaking it down in to smaller parts... I can't see what I've done wrong here... I can split the string in to an array, but my for loop isn't return each new array item... can't figure out why...
function titleCase(str) {
//convert string in an array of words
var strArray = str.split(" ");
//loop over array of words for way to access each word individually
for (var i=0; i<strArray.length; i++) {
return strArray[i];
}
//convert string in an array of words
var strArray = str.split(" ");
//loop over array of words for way to access each word individually
for (var i=0; i<strArray.length; i++) {
return strArray[i];
}
i have general question Is weather API or Wikipedia API considered RESTful services ????
it returns only the first item (which would be strArray[0])
@ZeeMax I would say yes but don't blame me if i'm wrong :D
@caleb272 Your main problem would be:
XMLHttpRequest cannot load https://en.wikipedia.org/w/api.php?action=opensearch&titles=test&format=json. Origin http://s.codepen.io is not allowed by Access-Control-Allow-Origin.
There are workarounds... But its not very nice. You will have to ask google i think
XMLHttpRequest cannot load https://en.wikipedia.org/w/api.php?action=opensearch&titles=test&format=json. Origin http://s.codepen.io is not allowed by Access-Control-Allow-Origin.
There are workarounds... But its not very nice. You will have to ask google i think
@AndreWaroux you return on the first occurrence in the loop. That breaks the loop and ends the function immediately without counting up
help!!!!!!!!!!
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Accessing Nested Arrays in JSON ::
thank you @alpox !
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whats wrong with my code
var myPlants = [
{
type: "flowers",
list: [
"rose",
"tulip",
"dandelion"
]
},
{
type: "trees",
list: [
"fir",
"pine",
"birch"
]
}
];
// Only change code below this line
var secondTree = myPlants.trees[0]; // Change this line
@johnlovespi look carefully at what your
myPlants is. What type of variable is it?
object
@johnlovespi well technically it is, but specifically it's an array. Notice the starting
[ and the ending ]. So you should first access myPlants as you would an array.
Can someone tell me what I've done wrong? I get "Type error: this.setFullName is not a function
'''js
var Person = function(firstAndLast) {
var firstName = null;
var lastName = null;
Object.defineProperty(Person.prototype, 'getFirstName', {
get: function() {
return firstName;
}
});
Object.defineProperty(Person.prototype, 'setFirstName', {
set: function(name) {
firstName = name;
}
});
Object.defineProperty(Person.prototype, 'getLastName', {
get: function() {
return lastName;
}
});
Object.defineProperty(Person.prototype, 'setLastName', {
set: function(name) {
lastName = name;
}
});
Object.defineProperty(Person.prototype, 'getFullName', {
get: function() {
return firstName+ ' '+ lastName;
}
});
Object.defineProperty(Person.prototype, 'setFullName', {
set: function(name) {
firstName = name.split(' ')[0];
lastName = name.split(' ')1;
}
});
this.setFullName(firstAndLast);
};
var bob = new Person('Bob Ross');
bob.getLastName();
'''
:bulb: to format code use backticks! ``` more info
so myPlants.tress[1] @dcnr ?
@johnlovespi no myPlants is an array of objects, it's an array that holds your object
yo, homeslices, anyone do the counting cards thing ? i just don't get how it should function
var Person = function(firstAndLast) {
var firstName = null;
var lastName = null;
Object.defineProperty(Person.prototype, 'getFirstName', {
get: function() {
return firstName;
}
});
Object.defineProperty(Person.prototype, 'setFirstName', {
set: function(name) {
firstName = name;
}
});
Object.defineProperty(Person.prototype, 'getLastName', {
get: function() {
return lastName;
}
});
Object.defineProperty(Person.prototype, 'setLastName', {
set: function(name) {
lastName = name;
}
});
Object.defineProperty(Person.prototype, 'getFullName', {
get: function() {
return firstName+ ' '+ lastName;
}
});
Object.defineProperty(Person.prototype, 'setFullName', {
set: function(name) {
firstName = name.split(' ')[0];
lastName = name.split(' ')[1];
}
});
this.setFullName(firstAndLast);
};
var bob = new Person('Bob Ross');
bob.getLastName();
@alpox thanks you are right . I just checked it with others :)
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Sorry about the previous paste! I can't understand why my setters/getters can't seem to work
@oglavas You define properties there. that means that are not functions, they are like variables. -> this.setFullName = firstAndLast
Hi all, trying to figure out how to get the first letter of the array[i] to capitalize it then lower case the remainder, any ideas?
function titleCase(str) {
str.split(" ");
for (i = 0; i < str.length; i++){
}
return str;
}
titleCase("I'm a little tea pot");
@dcnr ok so if i need to grab an object from the list
@khaduch after much trial and tribulation I got it to work, thanks dude
james-sangalli sends brownie points to @khaduch :sparkles: :thumbsup: :sparkles:
:star: 584 | @khaduch | http://www.freecodecamp.com/khaduch
can i just call the object and its proper
@James-Sangalli First lowercase the string, then loop over the strings and capitalize first letter. This should be enough for the start
@johnlovespi You have to get an object of an array with
var p = [ "foo", "bar"]
console.log(p[0]) // Prints "foo"And access objects like:
var p = {
foo: "bar",
some: "thing"
}
console.log(p.some) // Prints "thing"
@alpox I'm not sure I get it. They are defined as functions, via Object.defineProperty()
@alpox i am acessing it var plants={
var secondTree = myPlants.trees1;
getting in to the array myPlants.trees and array 1
help js resources
:point_right: js resources [wiki]
Tutorials
- JavaScript for Cats
- Professor Frisby's Mostly Adequate Guide to Functional Programming
- Eloquent Javascript (annotated)
- Speaking Javascript
- Exploring ES6
- Udemy - Javascript Understanding the Weird Parts (first 3.5 hrs)
References
Find javascript libraries at http://jster.net
See Also: :loop: Quick JS | :watch: Challenges | :wrench: Exercises | :clipboard: Editors | :newspaper: Blogs | :books: Books
@oglavas Object.defineProperty() defines a property on the given object. Not a function. That means, it creates something like a variable (named property) which on assignment (p.foo = something) calls the function you defined with the variable something. Abstract code:
function(input) {
this.foo = yourDefinedFunction(input);
}
@johnlovespi myPlants is an array. It holds two objects. Each object has the defined fields "type", and "list".
@alpox: In this page, under "Custom setters and getters", it seems that Mozilla are defining functions: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty
This message was deleted
help class
:point_right: challenge create a class to target with jquery selectors [wiki]
Create a Class to Target with jQuery Selectors
Not every class needs to have corresponding CSS. Sometimes we create classes just for the purpose of selecting these elements more easily using jQuery.
For this we use the target class on the button elements.
:pencil: read more about challenge create a class to target with jquery selectors on the FCC Wiki
@oglavas It doesnt say it defines functions. It says it defines properties. You just define the getter and the setter of the property as a function.
If you look at how they access the defined property in the example you see:
arc.temperature; // 'get!'
arc.temperature = 11;
arc.temperature = 13;
@alpox Yes, but the 'get!' is the result of the function being called (its console.log output).
@oglavas Of course it is :-) if accessing a property, your defined functions get called. But the syntax of accessing the property is not a function call syntax
Confused. This waypoint should not be that hard.
"Make Unique Objects by Passing Parameters to our Constructor"
var Car = function(wheels, seats, engines) {
//Change this constructor
this.wheels = 4;
this.seats = 1;
this.engines = 1;
};
//Try it out here
var myCar = new Car(4, 5, 1);results should be:
Calling new Car(3,1,2) should produce an object with a wheels property of 3, a seats property of 1, and an engines property of 2.
Calling new Car(4,4,2) should produce an object with a wheels property of 4, a seats property of 4, and an engines property of 2.
Calling new Car(2,6,3) should produce an object with a wheels property of 2, a seats property of 6, and an engines property of 3.
myCar should have number values for the wheels, seats, and engines properties.
Mine failed all but the last one. I think I just lost 10 IQ points.
@alpox, OK, I think I got what you're saying!!! I tried a simpler syntax and it seems to work, so I'll revisit it at a later time...now, how do I send these brownies? Let's see!
what does this mean No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://s.codepen.io' is therefore not allowed access.
wiki brownie points
:point_right: brownie points [wiki]
The number beside your picture on Free Code Camp tells you how many Brownie Points you have.
There are three ways you can get Brownie Points:
- Complete challenges - you get one point per challenge you complete
- Post relevant links on Camper News - you get 1 point for posting a link, and another point for each upvote your link gets
- Help other campers in chat - each time you help another camper and they thank you (by typing "thanks @yourname"), you will get a point
Brownie Points help you look like the kind of person who codes a lot, shares relevant links, and helps people.
They also add to your Streak.
:pencil: read more about brownie points on the FCC Wiki
use thanks and his name using the at symbols @oglavas
caleb272 sends brownie points to @oglavas :sparkles: :thumbsup: :sparkles:
@PhotoGeek1 You don't assign the function parameters to the this.<something> variables
:star: 311 | @oglavas | http://www.freecodecamp.com/oglavas
thanks @alpox
oglavas sends brownie points to @alpox :sparkles: :thumbsup: :sparkles:
:warning: could not find receiver for alpox
I cannot get these :D i'm not a freecodecamp member
thats cool what made you want to jump on the chat and help
@caleb272 That means that the requested server is not allowed to unknown domains (this is caused by the header settings)
var Bike = function() {
// Only change code below this line.
var gear=0;
this.setGear = function(change){
gear=gear+4;
};
this.getGear = function(){
return gear;
};
};
var myCar = new Car();
var myBike = new Bike();
myBike.setGear(change);
@alpox Oh, I see...
@caleb272 I just stumpled on that thing here today and found it quite cool :D and i like to help out
can some one tell me where is it going wrong
Hi guys, can anyone explain to me what the this. operator does. I tried using it for a challenge to set a private variable, but it didn't work. So can someone explain to me the differences of the two following lines of code?
var name = "hello";
this.name = namePassed;
name = namePassed;Assume all code is inside their appropiate methods and classes.
@alpox thats awesome could you help we with this error i have been working on it all day http://codepen.io/thecoder15/pen/grYOdW?editors=0010
@ratishidm Your gear only seems to add 4 each time you try to shift
the call to the wiki api is returning an error and google isn’t helping
@ratishidm in your function setGear you make no use of your parameter change.
In myBike.setGear(change) you use a variable change which is not defined anywhere. you have a var mica = new Car() without having defined an Object Car.
In myBike.setGear(change) you use a variable change which is not defined anywhere. you have a var mica = new Car() without having defined an Object Car.
@caleb272 In the browsers own console there occurs exactly the error i showed you... google has some workarounds... wait i will take a look
@alpox Not sure I understand. I copied the code in the example provided in the waypoint.
example provided:
example provided:
var Car = function(wheels, seats, engines) {
this.wheels = wheels;
this.seats = seats;
this.engines = engines;
};
@PhotoGeek1 ok, so what error messages are you getting?
@PhotoGeek1 That looks good to me...
same^
maybe its the way he is calling it?
paste all the code please
@alpox and i know it posts the error i can’t find any fix
@CraigBanach var name = "hello"; sets a local variable (only usable in current or inner scopes). this.name sets a variable name which sticks to the current object. name = namePassed creates a global variable (usable in all scopes)
@caleb272 I think i have the solution. wait a bit :-)
k thanks @alpox
caleb272 sends brownie points to @alpox :sparkles: :thumbsup: :sparkles:
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dam haha
hey guys think someone could help me out with something? Im stuck on escaping.
code please ^
Encode the following sequence, separated by spaces:
backslash tab tab carriage-return new-line and assign it to myStr
backslash tab tab carriage-return new-line and assign it to myStr
@CraigBanach
This is my code:
var Car = function(wheels, seats, engines) {
//Change this constructor
this.wheels = 4;
this.seats = 1;
this.engines = 1;
};
//Try it out here
var myCar = new Car(4, 5, 1);It still produces an object with 4 wheels, 1 seat and 1 engine, not 5 seats
what i did was:var myStr=\ \t \t \r \n;
@PhotoGeek1 what is wrong with it what doesn’t work
@PhotoGeek1 Well, that's what you are setting the variables to .... why wouldn't it?
o you need to change the this.wheels = 4 to this.wheels = wheels
and so on with the other ones
@Code-Eric You need to set myStr to a string.
Oh, duh. Ok
thanks @caleb272 @CraigBanach
photogeek1 sends brownie points to @caleb272 and @craigbanach :sparkles: :thumbsup: :sparkles:
:star: 371 | @craigbanach | http://www.freecodecamp.com/craigbanach
:star: 284 | @caleb272 | http://www.freecodecamp.com/caleb272
^ we all have that moment
how do I set it to a string?
var x = “”;
^^
@Code-Eric "enter string between quotes";
‘“”’;
Oh wow okay, thank you @CraigBanach
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@alpox var Bike = function() {
// Only change code below this line.
var gear=0;
this.setGear = function(change){
gear=change+gear;
};
this.getGear = function(){
return gear;
};
};
var myBike = new Bike();
myBike.setGear(change);
myBike.setGear(change);
i still have the same problem
myBike.getGear() should return 3 after calling myBike.setGear(3).
myBike.getGear() should return 1 after calling myBike.setGear(1).
@ratishidm ok, so where is the setGear function?
use gear += change;
@caleb272 don't use that.
why
@caleb272 gear = change;
this.setGear = function(change){
gear=change+gear;
};
gear=change+gear;
};
@ratishidm ok, so when gear is 1 and you pass in 3, what will happen?
it should return 3
@ratishidm why, since when does 1+3 = 3?
I set gear to 0
and i am trying to add change to gear
@ratishidm so you call setGear(3) to make it 3, then you call setGear(1) which makes it 4.
@caleb272 It seems it returns the data which is in this case an object with error response from wiki :P
@ratishidm SO you need to rethink your setGear fucntion.
no when i call setGear(1) which makes 1
@ratishidm ok then, don't change your function.
k thanks alpox
@caleb272 Does it work for you?
@caleb272 Oh wait it seems that i didnt create a proper link :-/ i dont know this tool...
haha
@CraigBanach see what ever the change value is i am adding that to gear
ya it wasn’t sending back anything its an error itself
@ratishidm and do you want it to do that?
Yes myBike.getGear() should return 3 after calling myBike.setGear(3).
myBike.getGear() should return 1 after calling myBike.setGear(1).
myBike.getGear() should return 1 after calling myBike.setGear(1).
?
alpo what link did you use
@ratishidm No, you don't want it to do that.
@ratishidm what if gear is 2?
and you add 3?
@caleb272 I dont know how to show you my working link
why
you can paste code in here
‘’' <
or i mean ``` <
@caleb272 I wanted to put here the codepen thing xD
@alpox just link it, save it as your own then link.
ya fork my project
I'm not logged in there... well i just put the code here
k
function searchClicked() {
var searchText = $("#search-bar").val();
var searchQuary = baseurl + "?action=random" + "&format=json";
console.log(searchQuary);
$.ajax({
url: searchQuary,
type: 'GET',
dataType: 'jsonp',
error: function() { alert('Failed!'); },
}).done(function(data) {
console.log(data)
})
}
so i see you have to use ajax
which i don’t know how to use
@caleb272 The actual thing what made it work was setting the dataType of the request to 'jsonp'. A usual $.getJSON uses dataType "json"
o ok thanks so much
@caleb272 Internal $.getJSON uses $.ajax too. There you can just make the full request setup.
You find the reference here: http://api.jquery.com/jquery.ajax/
You find the reference here: http://api.jquery.com/jquery.ajax/
thanks i will read it over
Can someone help me with Stand In Line? What am I doing wrong?
@caleb272 You're welcome. Have a good time :-)
function queue(arr, item) {
// Your code here
testArr.push(item);
return arr.shift(); // Change this line
}
// Test Setup
var testArr = [1,2,3,4,5];
// Display Code
console.log("Before: " + JSON.stringify(testArr));
console.log(queue([5,6,7,8,9], 1)); // Modify this line to test
console.log("After: " + JSON.stringify(testArr));
I'm going to bed now I have university early tomorrow... :D I'm sure i cannot get up ^^
how many years have you been doing web dev alpox
@caleb272 Not just web... different kind of things. I'm programming for 7 years now and had an education in it, work and learn myself all time next to school and university and am now doing my bachelor of informatics
nice i have been coding since 15 but just this past week started learning web dev
take care alpox
@caleb272 Nice to have you in row :D I was just from beginning a bit in web dev and i want to make a bigger project soon whats why i take a closer look. I'm currently interested in graphql requests (Apart from RESTful services), whats where i'm programming at the moment - https://github.com/alpox/graphql-go-gen my current project
@alpox What can GO lang be used for? I'm not too familiar with it.
@caleb272 Well thats just a thin wrapper to make the syntax of schema creation better, but i think graphql will be soon a big part of web development
ya i followed your git account i will checkin everyone and i while and read some code
@AustinThornley i have heard its backend similar to c++
@caleb272 Oh cool. I'm currently learning C++ and will be taking a class next year with C++
ya c++ is fun
by far one of my favorite languages
@AustinThornley Golang was created by google lately and should make low level programming easier. Its in the row of C and C++, has a garbage collector but stays fast and is made especially for fast compiling.
Recently it gets used a lot for web development for programmers which don't like NodeJS because of the javascript syntax, non-type checking and callback style.
See Farewell NodeJS
Recently it gets used a lot for web development for programmers which don't like NodeJS because of the javascript syntax, non-type checking and callback style.
See Farewell NodeJS
@AustinThornley : testArr.push(item); should just be arr.push(item);
well I’m off for diner by guys take care
Yup me too, finally :D
Cya guys
@Davinw Yeah, I finally got it :P
@AustinThornley Cool - those sort of "typed the wrong variable name" problems can be so frustrating, especially once your eyes start to go blurry from staring at text :)
@alpox Could you help me in this var Bike = function() {
// Only change code below this line.
var gear = 0;
this.setGear = function(change) {
gear += change;
};
this.getGear = function() {
return gear;
};
}; var myBike = new Bike();
myBike.setGear(4);
@ratishidm , your set get only needs to set it,
=, not increase it in any way... :blush:
@rphares thanks it worked
ratishidm sends brownie points to @rphares :sparkles: :thumbsup: :sparkles:
:star: 2947 | @rphares | http://www.freecodecamp.com/rphares
anytime~
hi all, cant see where I am going wrong on the return the largest number exercise:
function largestOfFour(arr) {
// You can do this!
var largest = 0
//return arr;
for(i = 0; i < arr.length; i ++){
if(arr[i] > largest){
largest = arr[i];
}
}
return largest;
}
largestOfFour([[4, 5, 1, 3], [13, 27, 18, 26], [32, 35, 37, 39], [1000, 1001, 857, 1]]);
@James-Sangalli
arr[i] is just your sub-array ([4,5,1,3] .. etc) you would need one more for loop to check their values
@James-Sangalli right now you're comparing the sub-array to
largest: if ([4,5,1,3] > largest) { etc..
bonfire making a person
Sorry, can't find a bonfire called making a person. [ Check the map? ]
bonfire make a person
:fire:Bonfire: Make a Person :link:
var Person = function(firstAndLast) {
return firstAndLast;
};
var bob = new Person('Bob Ross');
bob.getFullName();Fill in the object constructor with the methods specified in the tests.
more info:
bf details|bf links|hint
having problems getting the first few test cases to pass, bob.firstname returning undefined and the object key length being 6. not sure how else to set firstname and lastname without calling setfullname which pushes the object key count over 6
var Person = function(firstAndLast) {
this.setFirstName = (function(first) { this.firstName = first; });
this.setLastName = (function(last) { this.lastName = last; });
this.setFullName = (function(firstAndLast) { var splitMe = firstAndLast.split(" "); this.firstName = splitMe[0]; this.lastName = splitMe[1]; });
this.getFirstName = (function() { return this.firstName;});
this.getLastName = (function() { return this.lastName;});
this.getFullName = (function() { return this.firstName.concat(" ", this.lastName);});
this.setFullName(firstAndLast);
};
var bob = new Person('Bob Ross');
bob.getFullName();
Hey, anyone around to help?
Testing Objects for Properties — Does this one require an if statement?
// Setup
var myObj = {
gift: "pony",
pet: "kitten",
bed: "sleigh"
};
function checkObj(checkProp) {
myObj.hasOwnProperty("gift"); //true
myObj.hasOwnProperty("pet"); //true
myObj.hasOwnProperty("house"); //false
}
// Test your code by modifying these values
checkObj("gift");
what is the expected output?
a boolean to check to see if a property has an object.
checkObj("house") should return "Not Found".
that looks like if statement material to me
if (!myObj.hasOwnProperty... return "Not Found", thats not complete code obviously
yeah, I’ll post what I have in a minute — finishing up.
I’m not quite sure of how to check for a something that does not have a property.
anyone know why i can’t use
var x = lastName.length - 1;
but Instead have to write it like this:
var x = lastName[lastName.length - 1];
// Setup
var myObj = {
gift: "pony",
pet: "kitten",
bed: "sleigh"
};
function checkObj(checkProp) {
if (myObj.hasOwnProperty("checkProp")) {
return myObj[checkProp];
} else (myObj.hasOwnProperty) {
return "Not Found";
}
}
// Test your code by modifying these values
checkObj("gift");
i guess codecademy doesn't teach zero inexing.
Examples:
- 100/10 evaluates to 10
- "Jane".length + 5 evaluates to 9
- 5*(3+1) evaluates to 20
@Reza7865 try x = (lastname.Length) - 1;
@eccentricafterglow take the quotes out of the if statement, you are checking for a variable
@eccentricafterglow by quoting
"checkProp" you turned it into a string, when it should be a variable. So remove the quotes. You should also remove (myObj.hasOwnProperty) in your else
@Reza7865 to answer your "why" question, dot notation functions differently than bracket notation when accessing object properties.
Hrm, I’m still getting an error when I do that.
but it does pass.
var myObj = {
gift: "pony",
pet: "kitten",
bed: "sleigh"
};
function checkObj(checkProp) {
if (myObj.hasOwnProperty(checkProp)) {
return myObj[checkProp];
} else (!(checkProp)); {
return "Not Found";
}
}
// Test your code by modifying these values
checkObj("gift");
At the line where it’s the else statement — It’s expecting an assignment or function call and instead saw an expression.
@Davinw ahh makes sense, thnxx
@eccentricafterglow you don't need a condition after an
else
oh
@eccentricafterglow remove this
(!(checkProp));
remove everyone?
er, everything?
okay.
@Reza7865 for lack of a better way to describe it, dot notation is "static" in how it works, which is why you can't use a variable name to access a property using dot notation. Whereas bracket notation is an "evaluatable" statement, if I can make up a word
thanks @calicode !!
eccentricafterglow sends brownie points to @calicode :sparkles: :thumbsup: :sparkles:
@Reza7865 np!
@eccentricafterglow
else is like "do this if any other if doesn't trigger"
:star: 337 | @calicode | http://www.freecodecamp.com/calicode
@eccentricafterglow it's like the
default in a switch
okay
else if might have been what you were thinking of
I’m still trying to figure out the differences between if, else, and else if.
@Reza7865
Here's a TLDR :P
Here's a TLDR :P
Link to longer explanation
TLDR;
var myObj = {
thePropertyName: "the Value";
};- Using
.you are directly using the property name itselfvar result = myObj.thePropertyName; // the Value - Using
[]there are two ways:- Directly access by quoting the property name:
var result = myObj["thePropertyName"]; // the Value - Using a variable as property name by not quoting
herevar prop = "thePropertyName"; var result = myObj[prop]; // the Valuepropis the variable that holds the name of your object property
- Directly access by quoting the property name:
and in that case it would be else if (!myObj.hastOwnProperty(checkProp)) { return not found}
@Davinw ahhh thanks for clarifying, makes total sense
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@Reza7865 Yw!
@eccentricafterglow
Something like this:
Something like this:
if (check this, and if true) {
// do this
} else if (if the first IF is false, check this too, and if true) {
// do this one instead
} else {
// if none of the if and else if passes, just do this
}
oooh
I love these charts.
I should copy these.
Does anyone know if there's an SF room?
Thanks dcnr!
er Thanks @dcnr !
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you're welcome, thanks too! @eccentricafterglow
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var array = [4,5,6,7,8];
var singleVal = 0;
// Only change code below this line.
var singleVal = array.reduce(function(previousVal, currentVal){
return previousVal + currentVal;
},0);
@reacorbett
reduce's previousVal is the first index of your array, but if an initial value is set
@reacorbett in this case the
0 part
@reacorbett it would be set to that
@reacorbett then after one "iteration"
previousVal will be equivalent to your last return so in this case it would be previousVal + currentVal
This message was deleted
so is currentVal the sum of the arrays indexes?
@dcnr
@reacorbett
[1, 2, 3, 4]if initial value is not set:
First iteration:
previousVal = 1
currentVal = 2
return previousVal + currentVal; // 3Second iteration:
previousVal = 3 // sum of last return
currentVal = 3
return previousVal + currentVal; // 6Third iteration:
previousVal = 6 // sum of last return
currentVal = 4
return previousVal + currentVal; // 10The entire array has been processed so
final value is 10
ok. @dcnr Thanks.
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@reacorbett just think of it this way
- if previousVal is not set, it's the first value of your array, and currentVal is the 2nd
- if initial value is set, currentVal is the first value of your array instead
- after your reduce function returns, previousVal would be the value of your last return, and currentVal is the next index
@dcnr If you ever want someone to feel really stupid, tell them to go learn javascript.
@reacorbett I'm sorry if I explained it in a terrible way
err I mean, I'm a terrible explainer
@dcnr No it was perfect.
@dcnr I understand .reduce now.
@reacorbett
You can do nifty stuffs with it, see if you can trace this :D
You can do nifty stuffs with it, see if you can trace this :D
var myArr = [["COWS", 10], ["SHEEPS", 20], ["CHICKENS", 30]];
var newObj = myArr.reduce(function(obj, animals) {
var animal = animals[0];
var amount = animals[1];
obj[animal] = amount;
return obj;
}, {}); // initial value is an empty object
// newObj is equivalent to
{
COWS: 10,
SHEEPS: 20,
CHICKENS: 30
}
Since I set an initial value which is
{}, obj (aka our previousval) is now that {}, and animals will be the first index in our array which is ["COWS", 10] and so on!
@dcnr so, obj would be set to cows or ["COWS", 10]?
oh ok
}, {}); that sets the value of obj? @dcnr
@reacorbett yeah! :D
so it would be
myArray.reduce(function, initialValue)
that's why
{} is the initial value
oops forgot the .reduce
@reacorbett since I set an initial value, it would be assigned to the first argument of reduce, in this case I named it
obj instead of previousVal
@reacorbett and since I set an initial value,
currentVal (which I named animals) would be set to myArr[0]
animals[0]?
or myArr[0]
var array = [4,5,6,7,8];
var singleVal = 0;
// Only change code below this line.
var singleVal = array.reduce(function(previousVal, currentVal){
return previousVal + currentVal;
},0);
singleVal = array;
any idea why this code would not be adding the values of array
This message was deleted
@vsidoren look at singleVal = array; and ask yourself why is that there
@reacorbett I dunno if this helps, but a visualizatoin
hi all, i'm getting trouble understanding the instruction in "Exact Change" project
@reacorbett is the assignment not passing the value of array after the reduce function has run ?
@dcnr thats awesome, yeah.
the instruction say "return change in coin and bills, sorted in highest to lowest order.", it is mean i can return something like 0.50??
Help Missing Letters
:point_right: algorithm missing letters [wiki]
Problem Explanation:
- You will create a program that will find the missing letter from a string and add it. If there is not missing letter it will return undefined. There is currently no test case for it missing more than one letter, but if anything recursion can be implemented or a second or more calls to the same function as needed. Also the letters are always provided in order so there is no need to sort them.
Help Exact Change
:point_right: algorithm exact change [wiki]
Problem Explanation:
- You have to create a program that will handle when the register does not have enough cash or will have no cash after the transaction. Other than that it needs to return an array of the change in the form of an array, so that will be a 2D array.
got it ......
duh
thanks @reacorbett
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@vsidoren
var singleVal = array.reduce(function(previousVal, currentVal){
return previousVal + currentVal;
},0);that line of code already defines singleVal as a var and it makes it equal to array.reduce(function(previousVal, currentVal){
return previousVal + currentVal;
@reacorbett -- did you understand @dcnr 's example ... ? he's creating objects ... what he's doing can be super helpful for challenges like exact change ...
hey guys has anyone completed "Make Object Properties Private" ?
he shows what the objects created are ...
@reacorbett here's another example visualization I think this one is easier to follow with the console.log
function findLongestWord(str) {
var array = str.split(" ");
var longestword = 0;
for (i=0; i < array.length;i++) {
// i know something array[i] > something else
}
}
findLongestWord("The quick brown fox jumped over the lazy dog");
@vvang044 -- many times ... :)
lol.....
can someone point me in the right direction without giving me the answer
hi @bitgrower ! :candy: :cake:
hello @dcnr ...
nice example, thanks for that @dcnr ..
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that ellipsis always gives off the feeling that you're unhappy :(
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thanks @bitgrower ...
dcnr sends brownie points to @bitgrower :sparkles: :thumbsup: :sparkles:
:star: 632 | @bitgrower | http://www.freecodecamp.com/bitgrower
bitgrower @bitgrower still basks in the glory of @dcnr's appreciation (and perf testing) of my smallest common denominator code ... :)
im confused what to do with that exercise
@bitgrower I am understanding it a lot better.
@JToddFL -- if you are having trouble conceptualizing ... I would suggest figuring out what the steps are that you would need to take if you were to do it without code ...
do it with pencil & paper first ...
Hey @bitgrower @dcnr Recall discussions about the smallest common multiple other day? I MADE my own Algorithm! WHOO! Should I post it here?
@bitgrower well i seperated it into an array and i know i need to find the largest item of that array
dcnr @dcnr bows and is humbled and speechless
@JToddFL -- there are tons of different ways of doing that @JToddFL -- what tools do you have available
@pkshreeman that's an achievement worthy of celebration :D :D
@pkshreeman -- I kinda discourage posting solutions here ... maybe paste them into a jsbin or repl.it -- and paste the url in ...
guys check this out https://www.youtube.com/watch?v=GbzmlbWRo-0&feature=em-uploademail
@bitgrower I was going to do a loop to cycle through each item just dunno where to go from there.
@pkshreeman @bitgrower or pm us!
eeflores @eeflores waits anxiously for LCM code ...
dcnr @eeflores looks shiftily around
and I agree with @dcnr ... CONGRATS !!!
@caleb272 -- this part of that URL makes me nervous ... feature=em-uploademail
Definition clarification in Condense Arrays with Reduce
Definition:
To use reduce you pass in a callback whose arguments are an accumulator (in this case, previousVal) and the current value (currentVal).
var singleVal = array.reduce(function(previousVal, currentVal) {
return previousVal - currentVal;
}, 0);What does accumulator mean? Why are previousVal and currentVal not called parameters?
o that is because it was a link emailed to me it will take you to the video
@dcnr so, you assigned previousVal to "the". and prints to console.
currentVal is assigned the first index of the array. and prints to console
previousVal then is assigned the second index of the array. prints...
the currentVal is = 3rd index , and prints
and all is complete. the new value of new_sentence is assigned, and the last console.log prints.
Is that about it?
@dcnr sorry if that is hard to understand
can anyone look at my code and tell what's wrong with it?
@vvang044 sure thing!
var Bike = function() {
// Only change code below this line.
var gear =0;
this.setGear = function(change){
gear += change;
};
this.getGear = function(){
return gear;
};
};
var myCar = new Car();
var myBike = new Bike();
whats wrong
dang there are a lot of people having a problem with this tutorial
@vvang044 what's the error you are getting? Also, I don't see any code for the
Car constructor
raises his hang
sorry let me paste the whole code
@vvang044 no sum on setgear.. just set a value
var Car = function() {
// this is a private variable
var speed = 10;
// these are public methods
this.accelerate = function(change) {
speed += change;
};
this.decelerate = function() {
speed -= 5;
};
this.getSpeed = function() {
return speed;
};
};
var Bike = function() {
// Only change code below this line.
var gear =0;
this.setGear = function(change){
gear += change;
};
this.getGear = function(){
return gear;
};
};
var myCar = new Car();
var myBike = new Bike();
@vvang044 what is this exercise called on the map?
"Make Object Properties Private"
Has anybody done the Missing Letters Intermediate Algorithm?
@moigithub sorry i missed what you said
@vvang044
yes?
var Bike = function() {
// Only change code below this line.
var gear;
this.getGear = function() {
return gear;
};
this.setGear = function(change) {
gear = change;
};
}; this.setGear = function(change){
gear += change;
This code worked for me
You don't have to set an initial value for
gear, and you are updating the private variable gear for each call to setGear
@ParagonChuy What about it?
it did say at the end but thats where i got confused
awesome thank you.... guys
@rsprice @moigithub thank you
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:star: 355 | @rsprice | http://www.freecodecamp.com/rsprice
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happy coding
@vvang044 best of luck, feel free to ping me if you have any more questions
@JoshFisk Am I supposed to use modulo division or am I over complicating it?
@ParagonChuy Overcomplicating it
Dang it
@ParagonChuy Don't need modulo devision to see if the char code is 1 higher do you? : )
What do you mean?
@ParagonChuy You are talking about this one right? "Missing letters"
@reacorbett almost! you got the first 2 right, but after that previousVal is assigned the "return value" which is the concatenated "the" and currentVal". And currentVal is now the SECOND index :D
read the console.logs step by step :D
Yes
The way I'm thinking both the numbers before and after a given number are both the same: i.e both even or both odd , therefore me wanting to use modulo
@ParagonChuy Okay lets double check the problem, because you are confusing me
@dcnr got it.
hi guys
Okay
@ParagonChuy If I give you a string like this, a b c d f
yes
@ParagonChuy I skipped e in the alphabet
@ParagonChuy Your program would return e
The char code difference between d, and f is 2
Because e is missing
Okay if you use modulo on the character code of D and F you would have to get the same number.
i had been moving through the basic algorithm scripting til i got to the third-last one (seek and destroy) and my head is dizzy trying to solve it. the hint is to use the arguments object and Array.filter(). here's what i have, but obviously i'm grasping wildly at straws here...
function destroyer(arr) {
function axe(nextNeck) {
for (i = 0; i < arguments.length; i++) {
arguments.indexOf(nextNeck) > 0;
}
}
return arr.filter(nextNeck);
}
destroyer([1, 2, 3, 1, 2, 3], 2, 3);
@ParagonChuy You don't have to do anything fancy, you can just check when the char code does not increase by 1
if i could get some help as to just the proper approach to it, i'd appreciate that
Oh I see what you mean now
I'm great at overcomplicating things
No wonder I'm jobless xD
link to the problem page: seek and destroy
stuck on Make Object Properties Private
feeling like i'm swimming in deep waters the last 9-10 waypoints
maybe I'll just repeat JS again
@wumpafruits that one is a little confusing
@JoshFisk Still lost haha
@wumpafruits it's important to grasp the concept that's being presented in order to get the most out of the exercise, do you feel like you have a good understanding of what is going on?
var array = [1, 12, 21, 2];
array.sort(function(a, b) {
return a - b;
});
@cramjet I can pair program with you if you'd like
@ParagonChuy get the first letter, add 1 to the char code, see if it's the same as the next one, repeat until it does not match, then return the letter you find, return undefined if you run out of letters
@cramjet so. you can't use
arguments like a normal array, but you'll want to. the first part of arguments is arr (in this case [1, 2, 3, 1, 2, 3]. is this making sense so far?
might justcome back to it tomorrow @rsprice but i'll have to maybe read up on some other examples of this sort
@wumpafruits ok, well, it would be pretty quick :), but that's ok. Sometimes a break is all you need!
@wumpafruits also, a solid understanding of how filter works will get you pretty far with this particular exercise
^^ I'll look into it @rsprice thankyou
whoops sorry i didn't get an audio notification of a response!
I don't really need help with this, just wondering if I need a
break; after the answer = "delta"function myTest(val) {
var answer = "";
// Only change code below this line
switch (val) {
case 1:
answer = "alpha";
break;
case 2:
answer = "beta";
break;
case 3:
answer = "gamma";
break;
case 4:
answer = "delta";
}
// Only change code above this line
return answer;
}
// Change this value to test
myTest(1);
help Where do I belong
:point_right: algorithm where do i belong [wiki]
Explanation:
This can be a tricky problem to understand. You need to find where in the array a number should be inserted by order, and return the index where it should go.
:pencil: read more about algorithm where do i belong on the FCC Wiki
@rsprice not sure how to pair
@wumpafruits well, to nudge you in the right direction, I'll just say that the point of the exercise is all about private variable, getters and setters. The point is that you can modify a private variable by using methods as opposed to just mutating an object's property directly. Once you kind of wrap you head around that it's probably a lot easier to complete
@qualitymanifest yes, in fact i was using arr originally then tried to go to arguments
I want to add to that; the code works with the break and without the break. Just wondering if I need it
@cramjet we can use google h/o or something if you'd like. I don't bite I promise. Nor am I a Nigerian prince trying to scam you in some way.
:)
@qualitymanifest know whut, i'll go step by step. i follow what you mean
@AustinThornley it wouldn't matter since it's the end of your switch statement anyway :P unless there's some more code inside
okay so, since you already have
arr, you only need to be able to use the parts of arguments after the first part (index 0). so, make a for loop starting at 1, and push the rest of the arguments into an array that you can use
lol @rsprice
@dcnr Okay, thank you!
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:star: 712 | @dcnr | http://www.freecodecamp.com/dcnr
oh ok @qualitymanifest i'll try that. that does make immediate sense.
@cramjet cool. there's more to it, but it's a good start
I agree. That's a good place to start!
@AustinThornley but it's good practice to always break, and always have a
default case for your switch
```function end(str, target) {
// "Never give up and good luck will find you."
// -- Falcor
return (str.substring(-target.length,target.length) === target);
}
end("Bastian", "n");```
@dcnr
var array = [1, 12, 21, 2];
array.sort(function(a, b) {
return a - b;
});Why is it return a - b ? i beleive i understand why the compare functions are a and b, but i dont uderstand the return statement.
why doesn't the above code work?
@reacorbett It's the rules of
sort
- If compareFunction(a, b) is less than 0, sort a to a lower index than b, i.e. a comes first.
- If compareFunction(a, b) returns 0, leave a and b unchanged with respect to each other, but sorted with respect to all different elements. Note: the ECMAscript standard does not guarantee this behaviour, and thus not all browsers (e.g. Mozilla versions dating back to at least 2003) respect this.
- If compareFunction(a, b) is greater than 0, sort b to a lower index than a.
- compareFunction(a, b) must always return the same value when given a specific pair of elements a and b as its two arguments. If inconsistent results are returned then the sort order is undefined.
@reacorbett if you're sorting numbers
a - b would be ascending, and b - a would be descending
@rsprice and @qualitymanifest ok, so i tried this:
function destroyer(arr) {
var thePen = [];
for (i=1; i <= arr.length-1; i++) {
if (arr[0].indexOf(i) == -1) {
thePen.push(arr[i]);
}
return thePen;
}
}
destroyer([1, 2, 3, 1, 2, 3], 2, 3);...but it doesn't work. arr[0].indexOf(i) is not allowed :/
@cramjet you're getting a little ahead of yourself. this far, don't do anything other than putting the rest of arguments into an array
var code
@qualitymanifest ok, sorry about that. do i have to put the split the first array into it's own array (if that makes sense)
I see people mess this up all the time, and for good reason: it's fairly tricky.
function end(str, target) {
// "Never give up and good luck will find you."
// -- Falcor
return (str.substring(-target.length,target.length) === target);
}
end("Bastian", "n"); I'm getting a false when I'm expecting a true. Any ideas why? I tried this on the console and it worke fine. What am I missing?
@cramjet that sounds like a good idea
;)
@rsprice i swear i did something like this a couple hours ago... ok lemme see if i can backtrack...
and how does one get those formatted code snippets with the black background on chat?
@cramjet say you had an array like ["a", "b", 1, 2, 3, 4] and you wanted to just put 2, 3, 4 into a new array. you could loop over the array starting at index 3, and push the remaining parts into an array. that's what you want to do, but with the arguments object, and an index of 1
anyone?
!format
help format
:point_right: code formatting [wiki]
Inline code
This an inline `<paste code here>` code formatting with a single backtick(`) at start and end around the code.
Code Block
```js ⇦ Type 3 backticks and then press [shift + enter ⏎] (type js or html or css)
<paste your code here>,
then press [shift + enter ⏎]``` ⇦ Type 3 backticks, then press [enter ⏎]
See also: ☛ How to type Backticks | ☯ Compose Mode | ❄ Gitter Formatting Basics
Ah, much better
@kiniadit ^^^^^
function end(str, target) {
return (str.substring(-target.length,target.length) === target);
}
end("Bastian", "n");
@qualitymanifest not quiiite sure i'm following. would this not do to separate out the first element (the 'source' array)?
thank you!
sorry,
var thePen = arr[0];
@rspice any ideas why i'm getting false returned? i'm expecting a true
@cramjet come on over here https://kobra.io/#/e/-KBL_Ab9hbVDccoDCycL
@kiniadit can you walk me through what you're trying to do with that piece of code? Sometimes that helps
well, its essentially this challenge http://www.freecodecamp.com/challenges/confirm-the-ending
check if 'target' matches the end of 'str'
right
So walk me through what your code is doing
You are really close btw :)
although I'm sure you know that and it's driving you slightly mad at this point... if you're anything like me anyway
@kiniadit I think the arguments you are passing to
substring is causing your problem btw
Well, actually I know they are ;)
so my code is picking out a substring from the string str using the substr function. the first parameter of the substr function is the start location and if its negative the substr functions tarts from the end and counts backward. i chose 'target' length. so it goes back by the length of the target string. the second parameter then counts forward and then returns the string of that length.
@rsprice that's the crude walkthrough
My #230 is returning "No such contact" and "No such property," but none of the others, and I can't figure out why.
' for (var i=0; i < contacts.length; i++) {
if(!contacts[i].hasOwnProperty(prop)) {
return "No such property";
}
if(contacts[i].hasOwnProperty(firstName) && prop==="lastName"){
return contacts[i].lastName;
}
if(contacts[i].hasOwnProperty(firstName) && prop==="likes"){
return contacts[i].likes;
}
else if(!contacts[i].hasOwnProperty(firstName)){
return "No such contact";
}}'
@rspice going nuts
@rspice hmm so the arguments are messed up?
@kiniadit do this
str = 'Bastian';
str.substring(-str.length, str.length);
@rsprice but when i try the following in the console it works perfectly
"Bastian".substr(-"n".length,"n".length) === "n";
true
@kiniadit omg that is hilarious
@rsprice i know right
I know why it works
I think anyway
i'm trying navbar-collpase but it's not working. any help?
```Create a function timesFive that accepts one argument, multiplies it by 5, and returns the new value.
Run tests (ctrl + enter)
Hey all... so I just spent the last several hours on the "Title Case a Sentence" and I am happy to say I finally got it to work!! My question is, now that I have completed it is there anywhere to check what the "best" solution would be or at least other solutions?? I don't necessarily want to post it here as it would be a kind of spoiler to others working on it... I am sure that although my code works, it could probably be done better and would like to compare... is there somewhere to do this? Thanks guys.
thanks @reacorbett
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the first argument is an expression that is going to eval right to left, so literally the interpreter is going to look at your first argument and say "get me the length of n, then turn it into a negative number"
@AndreWaroux have you checked the wiki solution? You can also look at other people's profile and view their solutions
@kiniadit so your first argument to
substr ends up being -1 which should be the last character of your string
// Example
function minusSeven(num) {
return num - 7;
}
// Only change code below this line
function timesFive(num){
return 5*5;
}
function timesFive2(num){
return 5*2;
}
function timesFive0(){
return 0*5;
}
@dcnr no, I haven't... haven't seen the wiki solutions!
@rspice hmm, weird. ok.
console returns 0*5 only;
@kiniadit the second argument will return
1 which means you'll get one character after the last character... and there aren't any, so you'll just end up getting the last character
@AndreWaroux you can always start there! then look at other people's profile! http://www.freecodecamp.com/<usernamehere>
@dcnr Thanks! Looking at the wiki now (for the first time!)
andrewaroux sends brownie points to @dcnr :sparkles: :thumbsup: :sparkles:
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@AndreWaroux for example I always look at http://www.freecodecamp.com/bitgrower 's solutions
coz she's awesome
and well documented
awesome cheers!
@rsprice so it was just a 'false positive' of sorts. thats nuts....
@kiniadit
str.substr(str.length - 1); is how I went about it
function end(str, target) {
return str.substr(str.length - 1) === target);
}function findLongestWord(str) {
var array = str.split(" ");
var longestword = 0;
var total = 0;
for (i=0; i < array.length;i++) {
// i know something array[i] > something else
}
}
findLongestWord("The quick brown fox jumped over the lazy dog");
can anyone help with that
you can just give one argument, which tells your function take the length of my
string subtract one and extract from that index
@rspice, i'll try that out. thanks!
kiniadit sends brownie points to @rspice :sparkles: :thumbsup: :sparkles:
:warning: could not find receiver for rspice
@kiniadit no problem
@JToddFL what's up?
I just dunno where to go from here
ive sat and pondered forever lol
@AndreWaroux for example I always look at http://www.freecodecamp.com/bitgrower 's solutions
Now you're going to embarrass me ... some of my solutions are an unmitigated mess and badly need to be cleaned up ... but there are a couple of gems in there ... SCM is one ... seek & destroy, perhaps -- but the last time I looked at my comments, I still felt they could be way better ...
...and then there's my laziness in not using regexes ...
i think i have it right up until now. im trying to find the longest word in that string
@JToddFL that all seems reasonable
im just stuck now
@JToddFL when I get to this point, I write out in pseudocode all the logic I want my loop to execute
@JToddFL do you know what pseudocode is?
no
lol
@bitgrower eh there's always something to learn about, if you look for it!
so @JToddFL -- you have ...
- a set number of words
- each has a length
- you have to figure out which is longer than the others ...
//iterate over the words in the array
// at each word, compare it to the longest word
// ...?
// profit
whenever i set a variable to array[i] though i can only get it to loop
how can you split the long string you have into words ?
to the first word "The"
and never go on
@JToddFL you write out in plain english what your function should be doing. That way your logic is sound even before you start coding
@JToddFL -- then you are probably addressing it incorrectly ...
@bitgrower didnt i do that with splitting it into an array?
@rspice i did that on paper i just dont know how to do it with the loop i need
I'm just going by the symptom, @JToddFL -- not by looking at the code ...
...this is called "sanity checking" ... because our eyes can fool us!
so ... you take the evidence (it doesn't go beyond the word The) ... and say, hmmm what would cause that ?
sounds like
"The" is the longest word :)
do i need another for loop nested?
@bitgrower well I just saw your solution to the Title Case problem and almost cried! lol... mine is so much longer and convoluted!!
@JToddFL no way Jose
@AndreWaroux did you use a functional approach? :)
so i would prob write out an if statement saying if (index[i] > (i dunno what to put here)
LOL ... I think there are 3 solutions in there (2 are commented out) ... the first time I created a mini-state machine ...
...I steal profligately ...but I do try to understand what I've stolen, with the goal that I could replicate it if I were faced with the problem again ...
...so ... you too, can steal proligately and learn and have cool solutions ... :)
@bitgrower can I see your solution??
...just make sure you understand the code ... :)
@bitgrower I could see you first few solutions... but you final one is beautiful ;)
@rsprice ... most people's code can be seen by going to freecodecamp.com/<camper's name>
// iterate over each word in the string
// if the current word is longer than the longest word
// set the current word to be the longest word
@JToddFL ^
Something like this might work
and i do that with index[i]
?
and ... @AndreWaroux -- that last solution is one I can't take credit for ... i stole it ... :) ... i didn't know you could do that with replace ...
@bitgrower this term "mini state machine"... i haven't heard it before, but I am assuming it's what I've done... a hundred steps to get to the solutions...
@JToddFL
yeah something like
yeah something like
LARGEST=0
for WORD in [#WORDS ARRAY]
do
if [#WORD > LARGEST]
then
#LARGEST=WORD
fi
end
Ruby?
What sorcery is this!?
@JToddFL -- you're not that far from a solution ... I'm not sure why you weren't able to advance beyond "The" -- cuz I copied your code, output to console.log array[i] and it worked just fine for me ...
Hey guys anyone care to help me ive been stuck in this local variable thing in javascript. Im sure im just overly exhausted and missing something simple. prompt: Declare a local variable myVar inside myFunction
function myFunction() {
'use strict';
var loc =("myVar");
console.log(loc);
}
console.log(loc);
is that ruby lol
thanks though dc
not really
It's probably fortran or something, I just see
do and end and immediately think Ruby
@dcnr thanks
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@AndreWaroux -- a state machine is a type of ... uh ... hmmm how do I explain what a state machine is ...
...it does NOT mean something which takes a lot of steps ...
in specific ... I am keeping remembrance of what came in the past, what was my previous "state" -- specifically, was the previous character a blank or not ...
if it was blank, then I did one thing, otherwise I did something else ...
@bitgrower i know im not to far off. just been stuck on this one line of code foever
@JToddFL can you paste what you have right now?
@AndreWaroux -- state machines are discussed in some famous compiler books ... and there's all kinds of interesting math around them ... so there are things called finite state automata ... and other weird things .. they are kind of fun ... I wish I knew more about them ... :)
@JToddFL -- are you comfortable with console.log now ?
here's another cool resource for you: http://pythontutor.com/javascript.html ... paste your code in there and you can see, visually, how it runs ... what variables are created, what values they take, etc ...
Can anyone help with #230 (Profile Lookup)?
function longest (str) {
// iterate over each word in the string
// if the current word is longer than the longest word
// set the current word to be the longest word
};
This message was deleted
sure
@Code-Eric
Hey guys anyone care to help me ive been stuck in this local variable thing in javascript. Im sure im just overly exhausted and missing something simple. prompt: Declare a local variable myVar inside myFunction
function myFunction() {
'use strict';
console.log(myVar);
}
myFunction();
// run and check the console
// myVar is not defined outside of myFunction
console.log(myVar);
function findLongestWord(str) {
var array = str.split(" ");
var longestword = 0;
var total = 0;
for (i=0; i < array.length;i++) {
total = [index[i] + total
(if total > index[i])
}
}
findLongestWord("The quick brown fox jumped over the lazy dog");
not sure why that bracket is there
but i took it out
function longest (str) {
var words = str.split(' ');
// iterate over each word in the string
for (var i = 0; i < words.length; i += 1) {
// if the current word is longer than the longest word
// set the current word to be the longest word
}
};:point_up: February 24, 2016 8:46 PM
it looks like bash code to me ...
function longest (str) {
var words = str.split(' ');
var longest = '';
// iterate over each word in the string
for (var i = 0; i < words.length; i += 1) {
// if the current word is longer than the longest word
// set the current word to be the longest word
}
};if statement should do just fine. Constructing our if statement is easy now that we have our logic is simple english
Let's update again!
if (index[i] >= index[i -1])?
@AndreWaroux -- and if you want to see ES6 goodness ... check out @dcnr's portfolio ...
WAIT
not = to
just >
Huh?
no
that wouldnt work
what am i thinking
```// Example
var changed = 0;
function change(num) {
return (num + 5) / 3;
}
changed = change(10);
// Setup
var processed = 0;
function process(num) {
return (num + 3) / 5;
}
// Only change code below this line ```
well, you have to compare something to something, that's for sure ... what do you have to compare, @JToddFL ?
the current word
// Example
var changed = 0;
function change(num) {
return (num + 5) / 3;
}
changed = change(10);
// Setup
var processed = 0;
function process(num) {
return (num + 3) / 5;
}
// Only change code below this line
index[i] to the longest word so far
through the loop
i just dunno how to do that
...that sounds promising ...
i mean
words[i]
in his code
hmmm well you have to compare something to something ...
function longest (str) {
var words = str.split(' ');
var longest = '';
// iterate over each word in the string
for (var i = 0; i < words.length; i += 1) {
var currentWord = words[i];
// if the current word is longer than the longest word
// set the current word to be the longest word
}
};
@JToddFL ^
@bitgrower HELP please
@rsprice doh ok that makes sense hold on let me try
// Example
var changed = 0;
function change(num) {
return (num + 5) / 3;
}
changed = change(10);
// Setup
var processed = 0;
function process(num) {
return (num + 3) / 5;
}
// Only change code below this line
hang on, @sudheerswamy
what challenge is this, @sudheerswamy
made it to the algorithm challenges
coolness @reacorbett !!!
thanks @bitgrower
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@JToddFL look at the pseudo code in the body of that
for loop and try to construct your if statement based off of that logic
function longest (str) {
var words = str.split(' ');
var longest = '';
// iterate over each word in the string
for (var i = 0; i < words.length; i += 1) {
var currentWord = words[i];
// if the current word is longer than the longest word
// set the current word to be the longest word
}
};
After that all you'll have to do is
return the longest word :)
@bitgrower Call the process function with an argument of 7 and assign its return value to the variable processed.
@bitgrower @reacorbett @JToddFL @rsprice sorry I had to step away a bit, thank you too
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is that a fcc challenge, @sudheerswamy ? can you link me to it ?
@bitgrower it's a bastardized bash code lol
hahahahaha ...
@rsprice Thank you so much
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you got it @JToddFL ???? AWESOME SAUCE .. Congrats !!!
and thank you @bitgrower
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@sudheerswamy -- so ... look at the example they provide for you ...
@JToddFL no problem! It is extremely useful to use pseudocode to make sure your logic is sound. I would actually say it's best practice :)
function findLongestWord(str) {
var array = str.split(" ");
var longestWord = " ";
var total = 0;
for (i=0; i < array.length;i++) {
var currentWord = array[i];
if (currentWord.length > longestWord.length) {
longestWord = currentWord;
}
}
return longestWord.length;
}
findLongestWord("The quick brown fox jumped over the lazy dog");
that was my code btw
see what they are doing with the variable changed and calling the function change ...
excellent, @JToddFL ...
@JToddFL how many times do you use that
total variable?
i know i just noticed that lol
deleted it
;)
@JToddFL nicely done!
you also don't need to keep track of the actual word ... just the length ... :)
^^^^ for your consideration ... :)
thanks again!
Found an ES6 functional solution
if you want to see it
for which challenge, @emilaasa
longestword
ahhh ...
not sure what es6 means lol
my recommendation is to not put actual solutions here in the chat ... but put them into one of the js playgrounds like jsbin jsfiddle repl.it ... and then give people a link to the code ... that way they can see the solution if they want to ... but can also avoid seeing it if they don't want
@JToddFL -- the latest version of javascript -- came out last summer ...
Thats a good idea @bitgrower
:bow:
what version does freecodecamp use
it will accept ES6 syntax ...
but it accepts earlier versions as well ...
am i doing myself a disservice by learning an older version of javascript with freecodecamp
Is there a way for regex to check for ANY combination of three numbers? For example "123" <--- check for 231, 321 etc.
and stuff which runs under es5 is likely going to run under es6 ...
@JToddFL -- absolutely NOT ...
ok thanks @bitgrower
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lots of browsers do not run the latest version of js ... so it helps to know different versions ...
@JToddFL nope you are not, its an extension of the language and some cleanup pretty mcuh
In this case the only thing i used it for is the arrow syntax for anonymous functions
have you looked at Mozilla Developer Network ? when you look on one of the pages describing various methods, they will show which versions of JS it works with ...
it's always best to check for browser compatibility
i have briefly most of my learning has been through here, code academy, and a javascript book by jon duckett
for instance ... there is the es6 function endsWith -- very handy for one of the challenges ... but you should know how to solve that challenge without using the es6 version ...
hmm m... don't know that I've heard his name before ... there are PLENTY of excellent & free js resources ...
help js resources
:point_right: js resources [wiki]
Tutorials
- JavaScript for Cats
- Professor Frisby's Mostly Adequate Guide to Functional Programming
- Eloquent Javascript (annotated)
- Speaking Javascript
- Exploring ES6
- Udemy - Javascript Understanding the Weird Parts (first 3.5 hrs)
References
Find javascript libraries at http://jster.net
See Also: :loop: Quick JS | :watch: Challenges | :wrench: Exercises | :clipboard: Editors | :newspaper: Blogs | :books: Books
nice ill deff bookmark these
I think you might find JavaScript for Cats very helpful @JToddFL
wish there's a javascript the hard way series too
me too
i used that for python and then switched to javascript half way through
I agree with @bitgrower on this ----> "my recommendation is to not put actual solutions here in the chat"
now why don't they literally have Mozilla Developer Network in the wiki list of js resources ... they have devdocs ...
@bitgrower I like devdocs coz it's easier to search with
that would save me a lot of typing ... people ask too often what MDN is ... (or if I say Mozilla Developer Network .. they ask what that is ... )
@dcnr -- I know you do ... but you'd think it would be included in the js resources if devdocs is there ... LOL
@bitgrower maybe coz it's actually taking it from the MDN? :P lol I'm more surprised w3schools not there
less a matter of preference, more a matter of completeness ... esp since so many of the algo challenges ref MDN
function golfScore(par, strokes) {
// Only change code below this line
if (strokes == 1){
return "Hole-in-one";
}
else if (strokes <= par-2){
return "Eagle";
}
else if (strokes == par-1){
return "Birdie";
}
else if (strokes == par){
return "Par";
}
else if (strokes == par+1){
return "Bogey";
}
else if (strokes == par+2){
return "Double Bogey";
}
else if (strokes >= par+3){
return "Go Home!";
}
// Only change code above this line
}
// Change these values to test
golfScore(5, 4);
what is wrong with this code?????????
@sagit2002 plz use this
help format
:point_right: code formatting [wiki]
Inline code
This an inline `<paste code here>` code formatting with a single backtick(`) at start and end around the code.
Code Block
```js ⇦ Type 3 backticks and then press [shift + enter ⏎] (type js or html or css)
<paste your code here>,
then press [shift + enter ⏎]``` ⇦ Type 3 backticks, then press [enter ⏎]
See also: ☛ How to type Backticks | ☯ Compose Mode | ❄ Gitter Formatting Basics
@sagit2002 examine your
return strings closely
@dcnr -- w3schools has a less than positive rep in some circles ...
@bitgrower yeah that's why many newbies go there.. :/
@dcnr Ya they seems to be alright
@bitgrower coz the "better" ones are "too technical"
@sagit2002 no it isn't :P check again
@sagit2002 especially the failing cases
and I've heard some who have survived it and said they had to unlearn the stuff at w3 and re-learn it ...
the most massive, dwarf-star-heavy props to @qualitymanifest for all the super patient help!!
well ... I don't think that gets @qualitymanifest brownie points ...
@qualitymanifest thank you so very, very much for your help (oh, i guess i better say it regular like or the bot won't recognize)
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ahh thanks does, though ... LOL ...
@dcnr thanks it was a ! problem
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@cramjet haha :+1:
@sagit2002 right :D thanks too!
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ooooh ... 1000 -- congrats to the land of 4 figures, @qualitymanifest
@bitgrower tanks
whoa
@username tanks
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LOL
lol
tax @qualitymanifest
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see that
palindrome brownies
thanks @obama
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hah ... but tanks don't work for me ?!?
tax @bitgrower
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help file tax returns
no wiki entry for:
file tax returns
:/
dont remind me
almost time!
var total=0;
for(total=0;total<=myArr.length;total++);{
console.log(myArr[total]);
}
for(total=0;total<=myArr.length;total++);{
console.log(myArr[total]);
}
whats wrong?
@Raghuram1994 try removing the
= in total <= myArr.length
got it thak you @dcnr
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array indices are always !
Has any one had trouble with the Local Scope and Functions lesson in Javascript?
@MatiosTV oh have you declared myVar?
The instructions were to declare a variable inside of a function (for scope) ... and then in the editor is a comment saying to "remove the console log line to pass"
@MatiosTV if you have, then you need to follow what that comments say to pass
yeah
@dcnr So I tried, I deleted the console.log() in the function, then the one outside of the function
Then both of them and it's still not working.
@MatiosTV you only need [to delete] the one outside the function because myVar is scoped inside the function, you might need to refresh your browser
after you delete the log
@MatiosTV "need to delete the one outside I mean"
@dcnr Lmao. Wow. Thank you so much.
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@MatiosTV yeah often times a refresh solves many problems!
Ahahahahahahaha effing RIDICULOUS!!
well ... see youse all manana ...
g'night ...
:wave:
can any one Explain Nesting For Loops ?
what do you need explained about it
g'night @bitgrower buhbyes
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Hi guys, I'm having some trouble getting some data from a JSON request. The link http://quotes.stormconsultancy.co.uk/random.json is valid JSON according to jsonlint.com but when I execute a $.getJSON I get the error:
No Access-Control-Allow-Origin header is present on the requested resource. and if I request it as jsonp I get the error Uncaught SyntaxError: Unexpected token : BUT there is the correct data when I click on the link in the console. How can I get that data to be read correctly?
@Raghuram1994
var myArr = [10, 20, 30];We access array values via the element's index
var result = myArr[0]; // result would be 10So we can use a variable to represent the index number too
var index = 1;
var result = myArr[index]; // result would be 20So we can use use a for loop to "automate" the incrementing
of the variable we use as index, so we can "go through" the
entire array.
for (var index = 0; index < myArr.length; index++) {
console.log(myArr[index]);
}Will output:
10
20
30
@eagarcia8 have you tried asking in the Front End and the main room? They are more active about this kind of question
@dcnr Can you provide a link for those rooms? I thought JS would be the best room for jQuery stuff
@eagarcia8 here's the one for the front end https://gitter.im/FreeCodeCamp/HelpFrontEnd
you'll want to use https://gitter.im/FreeCodeCamp/HelpFrontEnd that said, someone else was having problems with that API yesterday, and neither myself nor another (more experienced) person here could figure it out. it doesn't help that the documentation on that API is really poor, so i would probably just recommend using another API.
@eagarcia8 this room's actually more focused on the challenges rather than using libs like jquery
@dcnr Gotcha, thanks for the link
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@eagarcia8 you can click the globe thingy next to the star at the upper right part of the chat room to get the list of FCC rooms
I looked online for a quotes API, but that's the only free one I found lol. @qualitymanifest
@dcnr Thanks for the tip.
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@eagarcia8 there's others. you could also just use an array of quotes instead of an API. plenty of challenges later where you will learn about using API's
@qualitymanifest Yea but I liked the idea of having access to a large amount of quotes. I've done API's before using PHP->XML but I'm new to JSON.
There has to be a way though, that link provides the data I want, just in an error, and jsonlint.com says its all good JSON and jsonp.
```function queue(arr, item) {
return item; // Change this line
}
// Test Setup
var testArr = [1,2,3,4,5];
// Display Code
console.log("Before: " + JSON.stringify(testArr));
console.log(queue(testArr, 6)); // Modify this line to test
console.log("After: " + JSON.stringify(testArr));
```
function queue(arr, item) {
return item; // Change this line
}
// Test Setup
var testArr = [1,2,3,4,5];
// Display Code
console.log("Before: " + JSON.stringify(testArr));
console.log(queue(testArr, 6)); // Modify this line to test
console.log("After: " + JSON.stringify(testArr));
Write a function queue which takes an array (arr) and a number (item) as arguments. Add the number to the end of the array, then remove the first element of array. The queue function should then return the element that was removed.
var oldArray = [1,2,3,4,5,6,7,8,9,10];
// Only change code below this line.
newArray = oldArray.filter(function(val) {
return val < 6;
} );
var newArray = oldArray;
@dcnr thanks
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@vsidoren because 1 - 5 is smaller than 6
@vsidoren because of this
var newArray = oldArray;
did the first alg. challenge on my own! !!!
anyone want to try out my wiki search http://codepen.io/thecoder15/full/grYOdW?editors=0100
@vsidoren you were supposed to add the
.filter part there, but since you made your own, just delete that part var newArray = oldArray;
@reacorbett congratulations :D
@dcnr thanks. Im proud of it.
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@reacorbett as you should be :D hahah
oh so that part is returning the original array @dcnr
@caleb272 post it in the Front End room too! https://gitter.im/FreeCodeCamp/HelpFrontEnd :D
@vsidoren yeah!
keeps getting me .... @dcnr thanks
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@vsidoren that part gets a lot of people!
var toFilter = [];
for (var i = 1; i < arguments.length; i++){
toFilter.push(arguments[i]);
}
function seekNd(val){
for (var i = 0; i < toFilter.length; i++){
if(val === toFilter[i]){
return false;
}
return true;
}
}
return arr.filter(seekNd);
}
destroyer([1, 2, 3, 1, 2, 3], 2, 3);
it will only filter the first argument out
I can<T see why
can I modify it to make it work or I need a complete different approach? (its the seek and destroy challenge)
@Hereshk you need to return true only after the loop has completed
@Hereshk there's better ways of doing it, but if you change that part, it should work
var array = [1, 12, 21, 2];
// Only change code below this line.
array.sort(function(a, b) {
return b-a;
});
@qualitymanifest It means that the loop was always stoping after the first test because the "return true" is misplaced?
@Hereshk yes. when you return, you exit the function. so you only want to return true if val isn't equal to any parts of toFilter ( the loop has to run the whole way through )
ok I understand :) thanks @qualitymanifest
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:+1:
please refer to the above link
it has good explanation
thanks @vinitm theres a lot there
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Hm, totally not even knowing what this means.
In Computer Science a queue is an abstract Data Structure where items are kept in order. New items can be added at the back of the queue and old items are taken off from the front of the queue.
Write a function queue which takes an array (arr) and a number (item) as arguments. Add the number to the end of the array, then remove the first element of array. The queue function should then return the element that was removed.
I've been rocking and rolling on this course as a whole, but this prompt is unfamiliar and it's not registering. Anyone have any tips?
@PattyCreates want to show me what you've got so far?
@PattyCreates if the concept of a queue is what's confusing, just think of a line of people. People enter a queue (line) from the back and remove themselves from the front. You want to do the same thing with your data. It's just a way of structuring the data you're working with.
a queue makes sense in order
But, I'm not sure as to what the prompt is asking?
function queue(arr, item) {
// Your code here
queue = [arr, item];
var item = "";
return item; // Change this line
}
// Test Setup
var testArr = [1,2,3,4,5];
// Display Code
console.log("Before: " + JSON.stringify(testArr));
console.log(queue(testArr, 6)); // Modify this line to test
console.log("After: " + JSON.stringify(testArr));
@PattyCreates, queue is a function not a variable.
Write a function queue which takes an array (arr) and a number (item) as arguments. Add the number to the end of the array, then remove the first element of array.
@PattyCreates the prompt is asking you to take an array as your first argument, and an item as your second. In the body of your function you should add the
item to the back of your array, and remove the first element of your array.
So it mentions adding a queue as a function with arguments, which it looks like is inherited by the code snippet. But i'm not sure how you add an array to a function?
hello! Please help! I did not quite understand this task
function wordBlanks(myNoun, myAdjective, myVerb, myAdverb) {
var result = "";
// Your code below this line
// Your code above this line
return result;
}
// Change the words here to test your function
wordBlanks("dog", "big", "ran", "quickly");
@PattyCreates you add data to a function by passing in arguments. You'll want to pass in an array as the first argument of your function
You will need to use string operators to build a new string, result, using the provided variables: myNoun, myAdjective, myVerb, and myAdverb.
@chandra90 try concantenating within var result = "";
oh.
@PattyCreates I did not get it. sorry
@rsprice okay. so maybe it's arr = [array of things]?
In Symmetric Difference Bonfire, the
sym function only accepts a single parameter but there are n number of arguments being passed. How ? I don't get it.
hello
var strReverse = str.replace(/[^A-Za-z0-9]/g,"").toLowerCase().split('').reverse().join('');
if(str == strReverse) {
return true;
}
return false;
@chandra90 concatenating. so var result = "This is the beginning " + myNoun + " etc";
any idea why it doesn't work
and you'll have to do it for all of them.
var testArr = [1,2,3,4,5];
console.log(queue(testArr, 6)); // Modify this line to test
@PattyCreates ^ you pass
testArr in as the first argument
@atryx are you trying to reverse a string or make it blank?
@PattyCreates you will manipulate the data in array, but you do not need to define it in any way
@coderNoob First I remove al punctuation char, then make it to lower case, then reverse it
@coderNoob I've test it with alert, and it print correct, the if doesn't work
doesn't know why
@atryx Can i have your sample string?
@coderNoob I think I know why
Damn, i'm dumb
it worked :D
@coderNoob Thanks man!
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The original string had spaces and punctuation
I was comparing apples with oranges
@rsprice I'm here.
```
function queue(arr, item) {
// Your code here
arr = testArr.shift(testArr[0]);
return item; // Change this line
}
// Test Setup
var testArr = [1,2,3,4,5];
// Display Code
console.log("Before: " + JSON.stringify(testArr));
console.log(queue(testArr, 5)); // Modify this line to test
console.log("After: " + JSON.stringify(testArr));
@PattyCreates first just try adding the element to the back of the array
@PattyCreates your intuition is correct to use shift, but you don't need to specify the element you want to remove
@PattyCreates Also, you want to perform the operations on
arr, or the array that you'll be passing in as an argument
@PattyCreates to clarify, you can simply use
arr.shift() to remove the first element of an array
This message was deleted
What does "add the number" mean? I generally confused on what the prompt is really asking for.
@PattyCreates the number will be
item, the thing being passed in to be added to the back of the queue
so am i supposed to define item?
Nope
queue(testArr, 5)
you pass in your array as your first argument @PattyCreates and then you pass in your
item, a number, as your second argument
your function will take the
item and add it to the back of arr, then you will remove the item from the front of arr and return it
@PattyCreates and that, as they say, is that.
To be honest, I really don't like the way they explained this. It's really confusing and I wouldn't explain a queue in this way.
Ah, so okay. you're saying if i understand this.
The first argument
arr is being taken in as the whole testArr and thats the end of the first argument accepted?
then second argument is the only one that you get to really see interpreted?
@rsprice ?
as in the items from the testArr?
the first argument
arr represents any array that you pass in to your function
the second argument is any item you pass in, in our case a number
testArray = [1,2,3,4]; queue(testArr, 5)
@PattyCreates you just as easily do
queue([1,2,3,4], 5);
They just happened to save the array to a variable, and pass that reference into the function.
@PattyCreates does that make sense?
Hm, like half way?
@PattyCreates Ok, so where is your understanding breaking down? Can you pinpoint what is confusing you?
@PattyCreates if you want, we can jump in a google hangout and I'll explain it to you if that's easier
should take 5 mins
I'm looking at this currently.
I mean, if you're willing to hop on a call, that would be awesome.
@PattyCreates yeah I'll PM you a link
Is this buggy?
If anyone else is confused by queue feel free to PM me and I'll give you the link as well
@Reza7865 not buggy.
read the commented out section. you're supposed to remove something to continue.
i hit the same issue.
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Hey guys need help
Modify the function abTest so that if a or b are less than 0 the function will immediately exit with a value of undefined.
Not making any sense to me can anybody explain what they want
I dont know how to display latitude and longitude
API
// Setup
function abTest(a, b) {
// Only change code below this line
// Only change code above this line
return Math.round(Math.pow(Math.sqrt(a) + Math.sqrt(b), 2));
}
// Change values below to test your code
abTest(2,2);
can anybody out there help me
@Whiplash5057 good going.
@sagit2002 I believe the instructions are saying "if" a is less than 0 exit the function of "if" b is less than 0 exit the function then return "undefined"
of = or
@codewalker007 if (a < 0 && b < 0){
return undefined;
}
this is not working
Any code suggestions
does it have to be AND or OR, I cant remember
@sagit2002 use "or" and you might want to try return "undefined";
@sagit2002 if you want to return undefined as a string use "undefined"
I am not sure if it has to be returned as a string
if (a < 0 || b < 0){
return "undefined";
}
No Luck
what challenge is that, I have to read the explanation
@kirbyedy Javascript - Return early pattern for functions
ah
you just have to return
no undefined or anything
@kirbyedy Thanks a lot
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@sagit2002 if it returns nothing it returns undefined
ah
Thanks everybody for the help
var myObj = {
gift: "pony",
pet: "kitten",
bed: "sleigh"
};
function checkObj(checkProp) {
// Your Code Here
if(myObj.hasOwnProperty("checkProp") === true){
return myObj.checkProp;
}else{
return "Not Found";
}
}
// Test your code by modifying these values
checkObj("gift");
want checkObj("gift") to return "pony". Any help?
@tmusimbi The dot notation only works if the property key string is a valid JS identifier and you write the key after the dot. Bracket notation works with keys that can be arbitrary strings, variables, or expressions.
@tmusimbi
.checkProp looks for property "checkProp". That is the problem there.
Can anyone point me in the right direction. I've got all of the elements in place to solve the Check for Palindromes bonfire, but there's something missing that won't let it check the === vs !==. Help!
function palindrome(str) {
if (str === "") {
return "unknown";
}
var lowerCase = str.toLowerCase();
var noSpaces = lowerCase.replace(/ /g, "");
var splitIt = noSpaces.split("");
if (splitIt === splitIt.reverse) {
return true;
} else if (splitIt !== splitIt.reverse) {
return false;
}
// Good luck!
}
palindrome("racecar");
@weslez The array method is .reverse but you invoke it with (), so use .reverse();
@weslez Your regexp for removing non-aplhanumerics is also wrong I believe.
@Masd925 Thanks alot!
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Thanks @Masd925 ! I don't know what regexp is, but I saw something about it while googling, so if I look into that I might find the solution. Thank you!!
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@weslez You have to join the array and the reverse array before comparing. You cannot compare array content with === because arrays are objects. === compares object identity (memory location). You can join the arrays to strings and compare them because strings are primitives.
^ this
@weslez look for help on PERL regex for Perl regular expressions. This is the standard that many languages now use to perform string matching. https://www.cs.tut.fi/~jkorpela/perl/regexp.html
@weslez in this line of code
var noSpaces = lowerCase.replace(/ /g, ""); / /g is the regular expression part. http://www.w3schools.com/jsref/jsref_replace.asp explains more
Can someone explain me why am getting the browser down after running this code, is from the fibonnaci intermediate algorithm:
function sumFibs(num) {
var fib = [];
fib[0] = 0;
fib[1] = 1;
for (var i = 2; i < num; i++){
fib[i] = fib[i-2] + fib[i-1];
}
return fib;
}
sumFibs(4);
If I wanted to delete all non-alphanumeric characters in a lengthy string how would I go about identifying them?
@PhotoGeek1 I am guessing something like
myString.replace(/\d/g, "");
this should delete all numbers from a string
but you would change it to target non-alphanumeric characters
@codewalker007 Thanks - I'm looking to keep 0-9 & a-z. I want to delete punctuation, spaces and symbols. Not sure where to look.
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@PhotoGeek1 https://regex101.com/
I like that one
@emilaasa thank you!
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Also if you are new to regex, http://regexone.com/ is great
They even have an exercise called Any Non-alphanumeric character :)
@Abel1987 in the loop you try to assign a value to non-existing indexes in the array fib
@PhotoGeek1 try this code
var str = "Mr Blue has a blue house and a blue car0123456789";
var res = str.replace(/[^A-Za-z0-9]/g, "");
console.log(res);
hi ther emates
im back again
@codewalker007 Thank you! You rock!
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np
anyone here did the no repeats please ?
im trying heaps algorithm but i keep getting circular object arrays and my shit freezes : |
@alpox I supose I will be creating it that way.
Can I just say that the algorithms are really hard? And I'm on the easy set. Brain is already getting fried.
@SaintPeter thanks
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@CataciD can you send your code ?
i have a generator but it freezes so im trying out a new way
but the code is
function permGen(n,arr){
var holder=[];
if(n===1){
perms.push(arr);
console.log(arr);
return;
} else {
for(var i=0; i<n-1; i++){
if(n%2===0){
holder=arr[i];
arr[i]=arr[n-1];
arr[n-1]=holder;
permGen(n-1,arr);
} else {
holder=arr[0];
arr[0]=arr[n-1];
arr[n-1]=holder;
permGen(n-1,arr);
}
}
}
return;
}
console.logs are for me to check
the function gets str.length and str.split(""); as the arguments
though the code here isnt what it should, permGen(n-1,arr); in the if statement should be before it and after for
then the generator works
but if i try pushing eac harray when n===1 to an array i declared outside, it pushes the second element every time
aka circular object array
whole thing is something like this