via pnpm
pnpm add happy-rusty
or via yarn
yarn add happy-rusty
or just from npm
npm install --save happy-rusty
via JSR
jsr add @happy-js/happy-rusty
for deno
deno add @happy-js/happy-rusty
for bun
bunx jsr add @happy-js/happy-rusty
then import to your code.
import { Some, None, Ok, Err } from 'happy-rusty';Enjoy the happiness.
import { Some, None, Ok, Err } from 'happy-rusty';
function judge(n: number): Option<Promise<Result<number, Error>>> {
if (n < 0 || n >= 1) {
return None;
}
return Some(new Promise(resolve => {
const r = Math.random();
resolve(r > n ? Ok(r) : Err(new Error('lose')));
}));
}
const res = judge(0.8);
if (res.isNone()) {
console.error('invalid number');
} else {
const result = await res.unwrap();
if (result.isErr()) {
console.assert(result.err().message === 'lose');
} else {
console.log(result.unwrap()); // must greater than 0.8
}
}