gates/examples/array.gates at master · lujjjh/gates · GitHub

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(function () {
  assert_eq([ 1, 4, 9 ], map(function (n, i) {
    assert_eq(n - 1, i);
    return n * n;
  }, [ 1, 2, 3 ]));

  assert_eq([ 2, 4 ], filter(function (n, i) {
    assert_eq(n - 1, i);
    return n % 2 == 0;
  }, [ 1, 2, 3, 4 ]));

  {
    let base = [ 1, 2, 3, 4 ];
    let first = true;
    assert_eq(10, reduce(function (acc, current, i, array) {
      if (first) {
        assert_eq(0, acc);
        assert_eq(1, current);
        first = false;
      }
      assert_eq(current - 1, i);
      assert_eq(base, array);
      return acc + current;
    }, 0, base));
  }

  assert_eq(null, reduce(function () { return 1; }, null, []));

  assert_eq(2, find(function (v) { return v % 2 == 0; }, [ 1, 2, 3, 4 ]));
  assert_eq(null, find(function (v) { return false; }, []));
  assert_eq(4, find_last(function (v) { return v % 2 == 0; }, [ 1, 2, 3, 4 ]));
  assert_eq(null, find_last(function (v) { return false; }, []));
  assert_eq(1, find_index(function (v) { return v % 2 == 0; }, [ 1, 2, 3, 4 ]));
  assert_eq(-1, find_index(function (v) { return false; }, []));
  assert_eq(3, find_last_index(function (v) { return v % 2 == 0; }, [ 1, 2, 3, 4 ]));
  assert_eq(-1, find_last_index(function (v) { return false; }, []));

  assert_eq([], null | map(() => {}));
})()