functionalscript/types/result/test.f.js

FunctionalScript is a purely functional subset of JavaScript

import { error, ok, unwrap } from "./module.f.js";
export default {
    example: () => {
        const success = ok(42);
        const failure = error('Something went wrong');
        if (unwrap(success) !== 42) {
            throw 'error';
        }
        const [kind, v] = failure;
        if (kind !== 'error') {
            throw 'error';
        }
        // `v` is inferred as `string` here
        if (v !== 'Something went wrong') {
            throw 'error';
        }
    }
};