set

type Set interface {

	// Add element to set
	Add(e interface{}) bool
	// Remove remove element to set
	Remove(e interface{})
	// Contains Judge whether the set contains the specified elements, if anyone does not contain, return false, otherwise return true
	Contains(e ...interface{}) bool
	// Clear remove all from set
	Clear()
	// Len return the number of element
	Len() int
}