everyutil/number/decimalToFraction.js

A comprehensive library of lightweight, reusable utility functions for JavaScript and TypeScript, designed to streamline common programming tasks such as string manipulation, array processing, date handling, and more.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.decimalToFraction = void 0;
/**
 * Converts a decimal number to its simplest fractional form.
 * For example, decimalToFraction(0.75) returns [3, 4].
 * @author @dailker
 * @param {number} n - The decimal number to convert.
 * @returns {[number, number]} The numerator and denominator of the fraction.
 */
function decimalToFraction(n) {
    if (Number.isInteger(n))
        return [n, 1];
    let denominator = 1;
    while (Math.round(n * denominator) !== n * denominator)
        denominator *= 10;
    const numerator = Math.round(n * denominator);
    const gcd = (a, b) => b ? gcd(b, a % b) : a;
    const d = gcd(numerator, denominator);
    return [numerator / d, denominator / d];
}
exports.decimalToFraction = decimalToFraction;