rusty-option

A rusty Option for TypeScript.

Warning

This is a Proof of Concept (PoC). It’s not meant for production: each method is intentionally verbose to show how this PoC works. Use it to experiment and maybe get inspired to build something even better!

🚀 Why rusty-option?

Here’s what makes rusty-option worth exploring:

1. if-let in TypeScript

   Rust’s if-let is adapted to TypeScript using for-of. This approach enables concise and readable handling of optional values.

2. Minimal Core

   The core implementation of Some and None is simple yet functional. Check out the code:

   • Some:

     rusty-option/src/option.ts

     Lines 408 to 410 in b331678

     	*[Symbol.iterator](): Generator<T> {
     	yield this.inner;
     	}

   • None:

     rusty-option/src/option.ts

     Lines 414 to 416 in b331678

     	*[Symbol.iterator](): Generator<never> {
     	//
     	}

📖 Example

import { Option, Some, None } from "rusty-option";

let debug = Option.from(process.env.DEBUG);

for (let v of debug) {
  console.log(`debug on: ${v}`);
}

let text = process.env.TEXT;
let result = Option.from(text.match(/rusty_(.+)/));

for (let [_, somethingRusty] of result) {
  console.log(`rusty: ${somethingRusty}`);
}

let n = Math.random() > 0.5 ? Some("foo") : None;

n.map((n) => n.length).mapOr(42, (v) => v * 14); // 42;

See also:

• https://github.com/shqld/rusty-option/blob/main/example.test.ts
• https://github.com/shqld/rusty-option/blob/main/src/option.ts

🔧 Installation

$ npm i rusty-option