## Optimal verification if a number is Palindrom in JS

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I have a problem I am sitting on for the past few days.

I want to write an optimal (in JS) program for verifying if a number is a Palindrome.

My current approach:

```function isPalidrom2(pali){
//MOST time consuming call - I am splitting the digit into char array.
var digits = (""+pali).split("");
//To get the length of it.
var size = digits.length;
var isPali = true;
for(var i = 0; i<Math.floor(size/2); i++){
//I am comparing digits (first vs last, second vs last-1, etc.) one by one, if ANY of the pars is not correct I am breaking the loop.
if(parseInt(digits[i]) != parseInt(digits[size-i-1])){
isPali = false;
break;
}
}
return isPali;
}```

To keep the spirit of you code, you could exit the loop with `return` instead of `break` and use the string directly without converting to an array. Strings have, as arrays, the possibility of an access single character with an index.

```function isPalidrom2(value) {
var digits = value.toString(),
length = digits.length,
i, l;

for (i = 0, l = length >> 1; i < l; i++) {
if (digits[i] !== digits[length - i - 1]) {
return false;
}
}
return true;
}

console.log(isPalidrom2(1));
console.log(isPalidrom2(12));
console.log(isPalidrom2(1221));
console.log(isPalidrom2(123));```

Check number is palindrome or not in JavaScript, . For example: 12321 after rotation 12321number is still same. Guide to Palindrome in JavaScript. Here we discuss the introduction and logical explanation with an example to check if the string/number is a palindrome.

The fastest is probably to rely on javascripts native methods:

``` function isPalindrome(str) {
const lower = str.substr(0, Math.floor(str.length / 2));
const upper = str.substr(Math.ceil(str.length / 2));

return lower.split("").reverse().join("") === upper;
}
```

Or leave away all unneccessary conversions from your code:

```function isPlaindrome(str) {
const half = str.length / 2;
for(var i = 0; i < half; i++)
if(str[i] !== str[str.length - i - 1])
return false;
return true;
}
```

Two Ways to Check for Palindromes in JavaScript, How do you check if a word is a palindrome in JavaScript? palindrome(“A man, a plan, a canal. Panama”) should return true; palindrome(“never odd or even”) should return true; palindrome(“nope”) should return false; palindrome(“almostomla”) should return false; palindrome(“My age is 0, 0 si ega ym.”) should return true; palindrome(“1 eye for of 1 eye.”) should return false

Number prime test in JavaScript, or sentence that's spelled the same way both forward and backward, ignoring punctuation, case, and spacing. Note. Palindrome number. When a number doesn’t change it’ s value or meaning even after rotation from left to right or vice a versa, then the number is palindrome number. For example: 12321 after rotation 12321number is still same. JavaScript code to check palindrome number

##### Code :

There are multiple methods that you can use (dunno if they are optimal) :

```Palindrom = _ => (_=''+_) === [..._].sort(_=>1).join``
```

Some more :

```let isPalindrome = __ => (_=(__=__+'').length)==0||_==1?!0:__[0]==__.slice(-1)?isPalindrome(__.slice(1,-1)):!1

let isPalindrome = (s,i) => (i=i||0)<0||i>=(s=''+s).length>>1||s[i]==s[s.length-1-i]&&isPalindrome(s,++i);

let isPalindrome = (str) => {
var len = ~~((str=str+'').length / 2);
for (var i = 0; i < len; i++)
if (str[i] !== str[str.length - i - 1])
return false;
return true;
}```

How to write palindrome in JavaScript, How do you check if a number is prime in JavaScript? The entry is a palindrome. The entry is a palindrome. Entry is not a palindrome. Flowchart: Live Demo: See the Pen JavaScript -Check whether a passed string is palindrome or not-function-ex- 2 by w3resource (@w3resource) on CodePen. Improve this sample solution and post your code through Disqus. Previous: Write a JavaScript function that reverse a number.

11 ways to check for palindromes in JavaScript, function isPrime(num) { if (num === 2) { return true; } else if(num > 1){ for (var i = 2; i < num; i++) { if (num % i !== 0 ) { return true; } else if (num === i * i) { return false } else { return false; } } } else { return false; } } console. log(isPrime(121)); All these tools are available in bin folders so we set path upto bin folders. Classpath variable is set for providing a path for predefined Java classes which is used in our application. All classes are available in lib/rt.jar so we set classpath upto lib/rt.jar.

Three ways to check for palindromes in JavaScript, A palindrome is a word, phrase, number, or other sequence of characters which reads the same backward or forward. The word “palindrome”  To check a number is palindrome or not without using any extra space Check if a number is Palindrome Given an integer, write a function that returns true if the given number is palindrome, else false. For example, 12321 is palindrome, but 1451 is not palindrome.

Javascript Algorithms #2: Palindromes - DEV Community ‍ ‍ , Here, we are going to learn how to check whether a given number is palindrome or not in JavaScript. 2 Optimal verification if a number is Palindrom in JS May 20 '18 2 spring-security wrong logged user Mar 7 '10 View all questions and answers →