locutus/python/math/isclose.js

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

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.isclose = isclose;
function isclose(a, b, relTol = 1e-9, absTol = 0) {
    //      discuss at: https://locutus.io/python/isclose/
    // parity verified: Python 3.12
    //     original by: Kevin van Zonneveld (https://kvz.io)
    //          note 1: Tests whether two numbers are close within relative/absolute tolerances.
    //       example 1: isclose(0.1 + 0.2, 0.3)
    //       returns 1: true
    //       example 2: isclose(1000.0, 1001.0, 0.01)
    //       returns 2: true
    //       example 3: isclose(1.0, 1.1, 1e-9, 0)
    //       returns 3: false
    const left = Number(a);
    const right = Number(b);
    const relative = Number(relTol);
    const absolute = Number(absTol);
    if (!Number.isFinite(relative) || !Number.isFinite(absolute) || relative < 0 || absolute < 0) {
        throw new RangeError('isclose(): tolerances must be non-negative finite numbers');
    }
    if (Number.isNaN(left) || Number.isNaN(right)) {
        return false;
    }
    if (left === right) {
        return true;
    }
    if (!Number.isFinite(left) || !Number.isFinite(right)) {
        return false;
    }
    const difference = Math.abs(left - right);
    const threshold = Math.max(relative * Math.max(Math.abs(left), Math.abs(right)), absolute);
    return difference <= threshold;
}