container

type Container[T any] interface {
	// List returns an iterator over all elements.
	List() lang.Iterator[T]
	// IsEmpty returns true if the container is empty.
	IsEmpty() bool
}

type Dictionary[K, V any] interface {
	// List returns an iterator over all elements in an implementation-defined order.
	List() lang.Iterator[KV[K, V]]

	// Find returns the value associated with the key, if present.
	Find(k K) (V, bool)
	// Insert sets the value of the key. Returns prior value, if present.
	Insert(k K, v V) (V, bool)
	// Remove removes the key. Returns removed value, if present.
	Remove(k K) (V, bool)
}

type KV[K, V any] struct {
	K K
	V V
}