rust-result-js/src/examples.ts

Implementation of Rust's Result object used for error handling

import { Err, Ok, Result } from './results';
import { createResult } from './utils';

const f = (): Result<number, string> => {
    const x = 7;

    if (x > 5) {
        return Ok(x);
    }
    return Err('Blah Blah');
};

const sleep = (ms: number) => new Promise((res) => setTimeout(res, ms));

const composed = createResult((Ok, Err) => {
    const x = 5;
    if (x % 2 === 1) {
        Ok(x);
    }
    Err('even number');
});

const asyncComputed = createResult(async (Ok) => {
    await sleep(200);
    Ok(2);
});

const asyncF = async () => {
    await sleep(1000);
    const x = 6;
    if (x % 2 === 0) {
        return Ok(x);
    }
    return Err('error in async function');
};

(async () => {
    const result = await composed;
    console.log(result.expect('bad shit with result'));

    const result1 = await asyncComputed;
    console.log(result1.expect('Error with async composer'));

    const result2 = await asyncF();
    console.log(result2.expect('Error with async func'));
})();

const result = f();
console.log(result.expect('error in sync result'));