functionalscript/types/nullable/test.f.js

FunctionalScript is a purely functional subset of JavaScript

import { map } from "./module.f.js";
export default () => {
    const optionSq = map((v) => v * v);
    const sq3 = optionSq(3);
    if (sq3 !== 9) {
        throw sq3;
    }
    const sqNull = optionSq(null);
    if (sqNull !== null) {
        throw sqNull;
    }
};