Result-class NPM

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}`)
});