result-class

Port the Result and Option classes from Rust to Typescript.

Installation

yarn add result-class

API

Please refer to the rust document
https://doc.rust-lang.org/std/result/enum.Result.html
https://doc.rust-lang.org/std/option/enum.Option.html

Usage

Option<T>, Some<T>, None

function getUserName(userId: number): Option<string> {
    return 1 === userId ? new Some('Vincent') : None.getInstance();
}

getUserName(1).match({
    Some: v => console.log(`User found = ${v}`),
    None: () => console.log('User cannot be found')
});

or

const name = getUserName(1).match({
    Some: v => v,
    None: () => 'Guest'
});

console.log(name);  // Vincent

Result<T, E>, Ok<T>, Err<E>

function division(dividend: number, divisor: number): Result<number, string> {
    if (divisor === 0) {
        return new Err('Division by zero');
    } else {
        return new Ok(dividend / divisor);
    }
}

division(dividend, divisor).match({
    Ok: v => console.log(`Answer = ${v}`),
    Err: e => console.log(`Error = ${e}`)
});

Contributing

1. Fork it!
2. Create your feature branch: git checkout -b my-new-feature
3. Commit your changes: git commit -am 'Add some feature'
4. Push to the branch: git push origin my-new-feature
5. Submit a pull request :D

License

This project is licensed under the MIT License - see the LICENSE file for details