let clamp = fn(value, minimum, maximum) {
  if value < minimum {
    return minimum;
  }
  if value > maximum {
    return maximum;
  }
  value
};

let distance = fn(left, right) {
  if left < right {
    | right - left
    | left - right
  }
};

test "clamp keeps values inside the range" {
  expect clamp(2, 3, 8) == 3;
  expect clamp(5, 3, 8) == 5;
  expect clamp(11, 3, 8) == 8;
}

test "distance is independent of order" {
  expect distance(4, 10) == 6;
  expect distance(10, 4) == 6;
}