locutus/php/math/is_finite.js

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

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.is_finite = is_finite;
function is_finite(val) {
    //  discuss at: https://locutus.io/php/is_finite/
    // original by: Onno Marsman (https://twitter.com/onnomarsman)
    //   example 1: is_finite(Infinity)
    //   returns 1: false
    //   example 2: is_finite(-Infinity)
    //   returns 2: false
    //   example 3: is_finite(0)
    //   returns 3: true
    let warningType = '';
    if (val === Infinity || val === -Infinity) {
        return false;
    }
    // Some warnings for maximum PHP compatibility
    if (typeof val === 'object') {
        warningType = Array.isArray(val) ? 'array' : 'object';
    }
    else if (typeof val === 'string' && !/^[+-]?\d/.test(val)) {
        // simulate PHP's behaviour: '-9a' doesn't give a warning, but 'a9' does.
        warningType = 'string';
    }
    if (warningType) {
        const msg = 'Warning: is_finite() expects parameter 1 to be double, ' + warningType + ' given';
        throw new Error(msg);
    }
    return true;
}