simple_queue.go

package main

import "fmt"

type Queue struct {
	items []interface{}
}

func (q *Queue) Enqueue(item interface{}) {
	q.items = append(q.items, item)
}

func (q *Queue) Dequeue() interface{} {
	if !q.IsEmpty() {
		item := q.items[0]
		q.items = q.items[1:]
		return item
	}
	return nil
}

func (q *Queue) IsEmpty() bool {
	return len(q.items) == 0
}

func (q *Queue) Size() int {
	return len(q.items)
}

func main() {
	queue := Queue{}
	queue.Enqueue("Alice")
	queue.Enqueue("Bob")
	queue.Enqueue("Charlie")
	fmt.Println(queue.Dequeue())  // Output: Alice
	fmt.Println(queue.Dequeue())  // Output: Bob
	fmt.Println(queue.Size())     // Output: 1
}