locutus/esm/python/math/isnan.js

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

export function isnan(x) {
    //      discuss at: https://locutus.io/python/isnan/
    // parity verified: Python 3.12
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //          note 1: Returns True if x is NaN (Not a Number)
    //       example 1: isnan(NaN)
    //       returns 1: true
    //       example 2: isnan(42)
    //       returns 2: false
    //       example 3: isnan(Infinity)
    //       returns 3: false
    return Number.isNaN(x);
}