locutus/esm/php/var/is_int.js

Locutus other languages' standard libraries to JavaScript for fun and educational purposes

export function is_int(mixedVar) {
    //      discuss at: https://locutus.io/php/is_int/
    // parity verified: PHP 8.3
    //     original by: Alex
    //     improved by: Kevin van Zonneveld (https://kvz.io)
    //     improved by: WebDevHobo (https://webdevhobo.blogspot.com/)
    //     improved by: Rafał Kukawski (https://blog.kukawski.pl)
    //      revised by: Matt Bradley
    //     bugfixed by: Kevin van Zonneveld (https://kvz.io)
    //          note 1: 1.0 is simplified to 1 before it can be accessed by the function, this makes
    //          note 1: it different from the PHP implementation. We can't fix this unfortunately.
    //       example 1: is_int(23)
    //       returns 1: true
    //       example 2: is_int('23')
    //       returns 2: false
    //       example 3: is_int(23.5)
    //       returns 3: false
    //       example 4: is_int(true)
    //       returns 4: false
    const num = Number(mixedVar);
    return typeof mixedVar === 'number' && mixedVar === num && Number.isFinite(num) && Number.isInteger(num);
}