hint [3/9]
You may use regular expressions (RegExp
) to remove unwanted characters from the string.
type
hint
for next hint :pencil: [Contribute at the FCC Wiki]
hint [4/9]
You may use Array.prototype.split
and Array.prototype.join
methods or for
loop.
type
hint
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hint [5/9]
You may lowercase the string using String.prototype.toLowerCase
.
type
hint
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hint [6/9]
Solution ahead!
type
hint
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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;
}
type
hint
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hint [8/9]
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;
}
We use regular expressions to replace any uppercase letter into a lowercase. Then we check if the string is the same as the reversed string using split()
to split the original string by characters, then reverse and then join it back together.
type
hint
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hint [9/9]
function palindrome(str) {
// make all letters lowercase and remove non-alphanumeric characters
str = str.toLowerCase();
str = str.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 eachother 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));
}
}
If you found this page useful, you can give thanks by copying and pasting this on the main chat: Thanks @Rafase282 @abhisekp @shadowfool
NOTE: Please add your username only if you have added any relevant main contents to the wiki page. (Please don't remove any existing usernames.)
type
hint
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hint [1/9]
Make sure you've tried to hard to solve it yourself before proceeding. :construction:
type
hint
for next hint :pencil: [Contribute at the FCC Wiki]
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
for next hint :pencil: [Contribute at the FCC Wiki]
hint [3/9]
You may use regular expressions (RegExp
) to remove unwanted characters from the string.
type
hint
for next hint :pencil: [Contribute at the FCC Wiki]
hint [4/9]
You may use Array.prototype.split
and Array.prototype.join
methods or for
loop.
type
hint
for next hint :pencil: [Contribute at the FCC Wiki]
hint [5/9]
You may lowercase the string using String.prototype.toLowerCase
.
type
hint
for next hint :pencil: [Contribute at the FCC Wiki]
hint [6/9]
Solution ahead!
type
hint
for next hint :pencil: [Contribute at the FCC Wiki]
hint [7/9]
function palindrome(str) {
var normalizedStr = str.replace(/[\W_]/g, '').toLowerCase();
var reverseStr = normalizedStr.split('').reverse().join('');
return normalizedStr === reverseStr;
}
type
hint
for next hint :pencil: [Contribute at the FCC Wiki]
hint [8/9]
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;
}
We use regular expressions to replace any uppercase letter into a lowercase. Then we check if the string is the same as the reversed string using split()
to split the original string by characters, then reverse and then join it back together.
type
hint
for next hint :pencil: [Contribute at the FCC Wiki]
hint [9/9]
function palindrome(str) {
// make all letters lowercase and remove non-alphanumeric characters
str = str.toLowerCase();
str = str.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 eachother 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));
}
}
If you found this page useful, you can give thanks by copying and pasting this on the main chat: Thanks @Rafase282 @abhisekp @shadowfool
NOTE: Please add your username only if you have added any relevant main contents to the wiki page. (Please don't remove any existing usernames.)
type
hint
for next hint :pencil: [Contribute at the FCC Wiki]
hint [1/9]
Make sure you've tried to hard to solve it yourself before proceeding. :construction:
type
hint
for next hint :pencil: [Contribute at the FCC Wiki]
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
for next hint :pencil: [Contribute at the FCC Wiki]
hint [3/9]
You may use regular expressions (RegExp
) to remove unwanted characters from the string.
type
hint
for next hint :pencil: [Contribute at the FCC Wiki]
hint [4/9]
You may use Array.prototype.split
and Array.prototype.join
methods or for
loop.
type
hint
for next hint :pencil: [Contribute at the FCC Wiki]
hint [5/9]
You may lowercase the string using String.prototype.toLowerCase
.
type
hint
for next hint :pencil: [Contribute at the FCC Wiki]
hint [6/9]
Solution ahead!
type
hint
for next hint :pencil: [Contribute at the FCC Wiki]
hint [7/9]
function palindrome(str) {
var normalizedStr = str.replace(/[\W_]/g, '').toLowerCase();
var reverseStr = normalizedStr.split('').reverse().join('');
return normalizedStr === reverseStr;
}
type
hint
for next hint :pencil: [Contribute at the FCC Wiki]
hint [8/9]
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;
}
We use regular expressions to replace any uppercase letter into a lowercase. Then we check if the string is the same as the reversed string using split()
to split the original string by characters, then reverse and then join it back together.
type
hint
for next hint :pencil: [Contribute at the FCC Wiki]