fatih-erikli / pattern-case

pattern<[number, number]>(1, 2)
.case(1, 2)(() => {})
.case("2", 3)(() => {}) // typescript throws compile error
.match();

pattern<[number, number]>(1, 2)
.case(2, 3)(() => {})
.match(); // pattern-case throws runtime error

test('early exit if the condition has met', () => {
  let executed = false;
  pattern<[number, number, number]>(1, 2, 3)
    .case(1, 2, 3)((a, b, c) => {return 1})
    .case(1, 2, 3)((a, b, c) => {executed = true; return 1})
    .match();
  expect(executed).toBe(false);
});

test('fall-through if the callback is not provided', () => {
  const result = pattern<[number, number, number]>(1, 2, 3)
    .case(1, 2, 3)(next)
    .case(1, 2, 3)((a, b, c) => {return 1})
    .match();
  expect(result).toBe(1);
});