package list

func Map[V any, T any](source []V, fun func(V) T) []T {
	result := make([]T, 0, len(source))
	for _, s := range source {
		result = append(result, fun(s))
	}
	return result
}

type Pair[T, U any] struct {
	Left  T
	Right U
}

func Chunck[T any](slice []T, size int) [][]T {
	chuncks := make([][]T, size)

	for i := 0; i < len(slice); i += size {
		for x := 0; x < size; x++ {
			end := i + x

			if end > len(slice) {
				break
			}

			chuncks[x] = append(chuncks[x], slice[end])
		}

	}

	return chuncks
}

func Zip[T, U any](left []T, right []U) []Pair[T, U] {
	// pick the array with the smaller length
	l := len(left)
	if len(left) > len(right) {
		l = len(right)
	}

	pairs := make([]Pair[T, U], len(left))
	for i := 0; i < l; i++ {
		pairs[i] = Pair[T, U]{left[i], right[i]}
	}
	return pairs
}

func Revert[T any](s []T) {
	for i, j := 0, len(s)-1; i < j; i, j = i+1, j-1 {
		s[i], s[j] = s[j], s[i]
	}
}