functionalscript/types/monoid/test.f.js

FunctionalScript is a purely functional subset of JavaScript

import { repeat } from "./module.f.js";
export default {
    numberAdd: () => {
        const add = {
            identity: 0,
            operation: a => b => a + b,
        };
        const resultAdd = repeat(add)(2)(10n); // 20
        if (resultAdd !== 20) {
            throw resultAdd;
        }
        const id = repeat(add)(42)(0n);
        if (id !== 0) {
            throw id;
        }
    },
    stringConcat: () => {
        const concat = {
            identity: '',
            operation: a => b => a + b,
        };
        const resultConcat = repeat(concat)('ha')(3n); // 'hahaha'
        if (resultConcat !== 'hahaha') {
            throw resultConcat;
        }
    }
};