package generics

// Pair represents key-value pair.
type Pair[K comparable, V any] struct {
	Key   K
	Value V
}

// Pairs represents a collection of key-value pairs.
type Pairs[K comparable, V any] []Pair[K, V]

// Keys returns list of key-value pairs' keys.
func (p Pairs[K, V]) Keys() []K {
	dst := make([]K, len(p))
	for i, pair := range p {
		dst[i] = pair.Key
	}
	return dst
}

// Values returns list of key-value pairs' values.
func (p Pairs[K, V]) Values() []V {
	dst := make([]V, len(p))
	for i, pair := range p {
		dst[i] = pair.Value
	}
	return dst
}