@mathlib/functions/dist/factorial.js

Mathematical functions

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
function factorial(n) {
    if (isNaN(n)) {
        throw new Error("n should be a number.");
    }
    let _n = typeof n === "string" ? parseFloat(n) : n;
    if (!Number.isInteger(_n)) {
        throw new Error("Factorial of fractions are not supported.");
    }
    if (_n < 0) {
        throw new Error("n should not be negative.");
    }
    let fact = 1;
    while (_n > 1) {
        fact *= _n--;
    }
    return fact;
}
exports.default = factorial;