hint [1/9]
Make sure you've tried to hard to solve it yourself before proceeding. :construction:
type
hint
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hint [2/9]
You have to check if the string you get as an input is a palindrome and return true
if it is, and false
otherwise.
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hint [3/9]
You may use regular expressions (RegExp
) to remove unwanted characters from the string.
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hint [4/9]
You may use Array.prototype.split
and Array.prototype.join
methods or for
loop.
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hint [5/9]
You may lowercase the string using String.prototype.toLowerCase
.
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hint [6/9]
Solution ahead!
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hint [7/9]
function palindrome(str) {
var normalizedStr = str.replace(/[\W_]/g, '').toLowerCase();
var reverseStr = normalizedStr.split('').reverse().join('');
return normalizedStr === reverseStr;
}
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/[\W_]/g
hint [1/9]
Make sure you've tried to hard to solve it yourself before proceeding. :construction:
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hint [1/9]
Make sure you've tried to hard to solve it yourself before proceeding. :construction:
type
hint
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hint [2/9]
You have to check if the string you get as an input is a palindrome and return true
if it is, and false
otherwise.
type
hint
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hint [3/9]
You may use regular expressions (RegExp
) to remove unwanted characters from the string.
type
hint
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hint [4/9]
You may use Array.prototype.split
and Array.prototype.join
methods or for
loop.
type
hint
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hint [1/12]
Make sure you've tried to hard to solve it yourself before proceeding. :construction:
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hint
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hint [2/12]
Our goal for solving this problem is tidying up the string passed in, and checking whether it is in fact a palindrome.
mom
, when you reverse the letters, it spells the same thing! Another example of a palindrome is race car
. When we take out anything that is not a character it becomes racecar
which is the same spelled forwards or backwards!Once we have determined whether it is a palindrome or not we want to return either true
or false
based on our findings.
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hint [3/12]
Regular expressions, RegEx
, can be used to remove unwanted characters from the string.
type
hint
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hint [4/12]
The Array.prototype.split
and Array.prototype.join
methods can be of use here. For
and while
loops are another alternative, or why not even map
!
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hint [5/12]
String.prototype.toLowerCase
can be used to make a string lowercase.
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hint [6/12]
Solution ahead!
type
hint
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hint [7/12]
function palindrome(str) {
return str.replace(/[\W_]/g, '').toLowerCase() ===
str.replace(/[\W_]/g, '').toLowerCase().split('').reverse().join('');
}
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hint [8/12]
function palindrome(str) {
str = str.toLowerCase().replace(/[\W_]/g, '');
for(var i = 0, len = str.length - 1; i < len/2; i++) {
if(str[i] !== str[len-i]) {
return false;
}
}
return true;
}
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hint [9/12]
(using recursion)
function palindrome(str) {
// make all letters lowercase and remove non-alphanumeric characters
str = str.toLowerCase().replace(/[^a-z|1-9]/g, "");
// if the length of the string is 0 then it is a palindrome
if (str.length === 0){
return true;
}
// if the first letter and the last letter of the string
// do not equal each other, then it is not a palindrome
if (str[0] !== str[str.length-1]){
return false;
}
//Else, run the function without the first and last characters.
else{
return palindrome(str.slice(1,str.length - 1));
}
}
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