package strain

// Ints is a slice of int
type Ints []int

// Lists is a slice of int slices
type Lists [][]int

// Strings is a slice of strings
type Strings []string

// Keep runs the Ints through a function and returns the ones that succeed
func (i Ints) Keep(kf func(int) bool) Ints {
	var ret Ints
	for idx := range i {
		if kf(i[idx]) {
			ret = append(ret, i[idx])
		}
	}
	return ret
}

// Discard runs the Ints through a function and returns the ones that fail
func (i Ints) Discard(df func(int) bool) Ints {
	var ret Ints
	for idx := range i {
		if !df(i[idx]) {
			ret = append(ret, i[idx])
		}
	}
	return ret
}

// Keep runs the Lists through a function and returns the ones that succeed
func (l Lists) Keep(kf func([]int) bool) Lists {
	var ret Lists
	for idx := range l {
		if kf(l[idx]) {
			ret = append(ret, l[idx])
		}
	}
	return ret
}

// Keep runs the Strings through a function and returns the ones that succeed
func (s Strings) Keep(kf func(string) bool) Strings {
	var ret Strings
	for idx := range s {
		if kf(s[idx]) {
			ret = append(ret, s[idx])
		}
	}
	return ret
}