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Nearest palindrome in JavaScript
We are required to write a function, say nearestPalindrome() that takes in a number n and returns a palindromic number that is nearest to the number n.
For example −
If the input number is 264, then the output should be 262
If the input number is 7834, then the output should be 7887
Basically, the approach will be, we divide the number into two halves (w.r.t. its length) and return the new number which is just the first half concatenated twice.
Example
const findNearestPalindrome = num => {
const strNum = String(num);
const half = strNum.substring(0, Math.floor(strNum.length/2));
const reversed = half.split("").reverse().join("");
const first = strNum.length % 2 === 0 ? half : strNum.substring(0,
Math.ceil(strNum.length/2))
return +(first+reversed);
};
console.log(findNearestPalindrome(235));
console.log(findNearestPalindrome(23534));
console.log(findNearestPalindrome(121));
console.log(findNearestPalindrome(1221));
console.log(findNearestPalindrome(45));Output
The output in the console will be −
232 23532 121 1221 44
Updated on: 31-Aug-2020
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