get help in general - we have more specialized help rooms here: https://gitter.im/FreeCodeCamp/home
can anyone help me with a redux challenge ('send action data to the store')?
@HoopsFTWGG what have you tried?
`const ADD_NOTE = 'ADD_NOTE';
const notesReducer = (state = 'Initial State', action) => {
switch(action.type) {
// change code below this line
case ADD_NOTE:
return {text:action.text}
// change code above this line
default:
return state;
}
};
const addNoteText = (note) => {
// change code below this line
return {type: ADD_NOTE,
text: note}
// change code above this line
};
const store = Redux.createStore(notesReducer);
console.log(store.getState());
store.dispatch(addNoteText('Hello!'));
console.log(store.getState());`
well, the ` in gitter didn't form it properly for this window, so just ignore those flanking the entire code body
@HoopsFTWGG in your reducer's switch statement you should just
return action.text
you don't need to return an object
ty
that works
:+1:
just wondering - why do we need to return objects in some cases and not in others
i suppose it depends on the specific use case
for example, your reducer needed 2 pieces of information from the action,
type and text it's easier to stick these into an object than to pass 2 different values
the reducer only needed to return a single value, so it didn't really need to use an object
gotcha
@HoopsFTWGG - isn't an object or array the only way to return multiple values in JavaScript? @thekholm80
@khaduch until the JS gods bestow tuples upon us
@simpleguy747 no idea what that is. I am doing mobile myself though
Hello Everyone!. function intersection(arrays){
var arr = arrays.reduce(function(acc, nxt){
console.log(acc.length)
});
return arr;
}
console.log(intersection([[5, 10, 15, 20], [15, 88, 1, 5, 7], [1, 10, 15, 5, 20]]))
var arr = arrays.reduce(function(acc, nxt){
console.log(acc.length)
});
return arr;
}
console.log(intersection([[5, 10, 15, 20], [15, 88, 1, 5, 7], [1, 10, 15, 5, 20]]))
why cannot i find the index of values inside acc which is[5, 10, 15, 20]
even acc.length is undefined
you need to return something from the
reduce()
if i return acc output will be [5, 10, 15, 20], How can i access elements inside
what are you trying to do?
i am trying to find the common elements of first array
output should be [5, 15]
so find elements from first array which are also present in all the remaining arrays?
its nested array
yes
https://goo.gl/ABhHkW you can see here
function intersection(arrays){
return arrays[0].filter(e => arrays[1].includes(e) && arrays[2].includes(e));
}
i did using filter and traditional way. trying to figure out just using reduce
is it even possible ?
as for why
acc.length was undefined
run this
function intersection(arrays){
var arr = arrays.reduce(function(acc, nxt){
console.log(acc, nxt);
console.log("---");
});
return arr;
}
the first time reduce() runs,
acc and nxt are - [ 5, 10, 15, 20 ] [ 15, 88, 1, 5, 7 ]
respectively
but you don't return anything when this iteration finishes
so next time
acc is undefined
and
nxt is [ 1, 10, 15, 5, 20 ]
Thank you
np
@simpleguy747 these may be useful: :sparkles:
fk that, ostrich knows the bestest tutorial
one that actually helped ostrich finally do a simple app
and remember java is not js. In simple terms, while JS does actually suck java is just great
the things above (there's also an advanced part you don't really need atm) have a lot of templates you can modify to do whatever
@EneCatalin @ndburrus Thanks for the cool links
simpleguy747 sends brownie points to @enecatalin and @ndburrus :sparkles: :thumbsup: :sparkles:
:cookie: 457 | @enecatalin |http://www.freecodecamp.org/enecatalin
:star2: 2229 | @ndburrus |http://www.freecodecamp.org/ndburrus
@simpleguy747 you're welcome! enjoy :palm_tree:
@EneCatalin JS does not suck, lot cool things to do with JS, now there is ES6 and things like type script in picture as well.
Has anyone used lightning design system? https://www.lightningdesignsystem.com/
has anyone tried the beta react/redux challenges today after the front-end redesign of the beta site? i think it's broken
@HoopsFTWGG are you referring to a challenge in particular ?
multiple challenges are giving me similar errors when they weren't yesterday
i
i'll give you an example
React and Redux - Manage State Locally First
received the following error:
Cannot read property 'rendered' of undefined
Cannot read property 'rendered' of undefined
So I tried:
import ReactDOM from 'react-dom';
and received the another error:
require is not defined
so I went back to a few previous challenges that I had solved and plugged in my old solutions, only to have more errors or the tests to run indefinitely.
@HoopsFTWGG give me a few minutes to try it. if you load the console is any error showing up?
i can't run any tests now
in any of the challenges
i was able to about 10 minutes ago
you don't need to run any test, in the dev console on the challenge are any errors coming up?
they were previously, but now there's literally nothing
its as if the console and the preview pane are unresponsive to whatever i type in the code editor
ok restarted my browser, here are the errors
Uncaught (in promise) TypeError: Request scheme 'chrome-extension' is unsupported
at sw.js:279
at sw.js:279
Uncaught TypeError: You provided an invalid object where a stream was expected. You can provide an Observable, Promise, Array, or Iterable.
at Object.r [as subscribeToResult] (/commons-9e38eccf8ebde527da51.js:1)
at t.error (/commons-9e38eccf8ebde527da51.js:25)
at t.notifyError (/commons-9e38eccf8ebde527da51.js:1)
at t._error (/commons-9e38eccf8ebde527da51.js:74)
at t.error (/commons-9e38eccf8ebde527da51.js:1)
at t._error (/commons-9e38eccf8ebde527da51.js:1)
at t.error (/commons-9e38eccf8ebde527da51.js:1)
at t._error (/commons-9e38eccf8ebde527da51.js:8)
at t.error (/commons-9e38eccf8ebde527da51.js:1)
at t.notifyError (/commons-9e38eccf8ebde527da51.js:1)
at Object.r [as subscribeToResult] (/commons-9e38eccf8ebde527da51.js:1)
at t.error (/commons-9e38eccf8ebde527da51.js:25)
at t.notifyError (/commons-9e38eccf8ebde527da51.js:1)
at t._error (/commons-9e38eccf8ebde527da51.js:74)
at t.error (/commons-9e38eccf8ebde527da51.js:1)
at t._error (/commons-9e38eccf8ebde527da51.js:1)
at t.error (/commons-9e38eccf8ebde527da51.js:1)
at t._error (/commons-9e38eccf8ebde527da51.js:8)
at t.error (/commons-9e38eccf8ebde527da51.js:1)
at t.notifyError (/commons-9e38eccf8ebde527da51.js:1)
@HoopsFTWGG im inquiring in the contributors room to see if anyone how is working on the update might know what's going on. normally i don't test the React/Redux sections
most of the challenges just give me the second error and not the first
@HoopsFTWGG the core-team requested to please open an issue on this repo https://github.com/freecodecamp/learn and provide as much detail as you can, they will investigate into it