onCase

onCase(pattern, fn)

Like .case, but calls fn(value) if matched. Useful for expensive computations.

const value = 2 as number;

match(value)
    .onCase(1, (num) => num * -1)
    .onCase(2, (num) => num * -2)
    .onCase(3, (num) => num * -3)
    .orThrow(); //=> -4