func (l *List) Add(entries ...interface{}) {
	l.key.Lock()
	defer l.key.Unlock()
	l.underlyer = append(l.underlyer, entries...)
}
func (l *List) Add(entries ...interface{}) {
	l.key.Lock()
	defer l.key.Unlock()
	l.underlyer = append(l.underlyer, entries...)
}
func ( l * List ) Add ( entries ... interface { } ) { l . key . Lock ( ) defer l . key . Unlock ( ) l . underlyer = append ( l . underlyer , entries ... ) }
// Add appends an entry to the logical end of the List.
Add appends an entry to the logical end of the List .