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TypeScript - check if number is palindrome
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In this short article, we would like to show how to check if a number is a palindrome using TypeScript.
Definition:
Palindromes are characters sequence that we can read the same backward as forward (e.g.
121,12321).
The solution shown in the article allows you to check if the integer and floating-point numbers are palindromes.
Practical example:
xxxxxxxxxx1
const isPalindrome = (input: number): boolean => {2
const string = input.toString();3
for (let i = 0, j = string.length - 1; i < j; ++i, --j) {4
if (string[i] !== string[j]) {5
return false;6
}7
}8
return true;9
};10
11
12
// Usage example:13
14
console.log(isPalindrome(12321)); // true15
console.log(isPalindrome(12.21)); // true16
console.log(isPalindrome(454)); // true17
console.log(isPalindrome(123)); // false18
console.log(isPalindrome(3.14)); // falseOutput:
xxxxxxxxxx1
true2
true3
true4
false5
false