An implementation of primitive operations like addition, multiplication and so on - recursively!

recursive-primitive.js

/**
 * @license Recursive-Primitive.js
 *
 * Copyright (c) 2014, Robert Eisele (robert@xarg.org)
 * Dual licensed under the MIT or GPL Version 2 licenses.
 **/

const add = (a, b) => b === 0 ? a : add(a + 1, b - 1);
const sub = (a, b) => b === 0 ? a : sub(a - 1, b - 1);
const mul = (a, b) => b === 1 ? a : add(mul(a, b - 1), a);
const div = (a, b) => b === 0 || a < b ? 0 : add(div(sub(a, b), b), 1);
const mod = (a, b) => a < b ? a : mod(sub(a, b), b);