as-function-as-default-test.ts

export function defaultComparator<T>(a: T, b: T): i32 {
  return (<i32>(a > b)) - (<i32>(a < b));
}

export function createDefaultComparator<T>(): (a: T, b: T) => i32 {
  return (a: T, b: T): i32 => (<i32>(a > b)) - (<i32>(a < b));
}

export function isSorted<T>(data: Array<T>, comparator: (a: T, b: T) => i32 = createDefaultComparator<i32>()): bool {
	for (let i: i32 = 1, len: i32 = data.length; i < len; i++) {
		if (comparator(data[i - 1], data[i]) > 0) {
			return false;
		}
	}
	return true;
}

isSorted<i32>([1, 2, 3, 4]);