@jamesfancy/when

when expression for JavaScript/TypeScript

Example

import { when } from "@jamesfancy/when";

function calcGrade(score: number) {
    return when(score)(
        [v => v >= 0 && v < 80, v => `B`],
        [v => v >= 80 && v < 100, v => `A`],
        [100, () => "S"],
        [_ => true, v => `D`],
    );
}