collections queue added

README.md

@@ -34,6 +34,7 @@ alghoritms
   * doubly linked list
   * binary tree
   * stack
+  * queue
 
 contribution
 ------------

collections/queue/queue.go

@@ -0,0 +1,33 @@
+package queue
+
+type Queue struct {
+	queue []interface{}
+    len int
+}
+
+func New() *Queue {
+	queue := &Queue{}
+	queue.queue = make([]interface{}, 0)
+    queue.len = 0
+    return queue
+}
+
+func (queue *Queue) Length() int {
+	return queue.len
+}
+
+func (q *Queue) Remove() interface{} {
+	tmp := q.queue[0]
+	q.queue = q.queue[1:]
+	q.len -= 1
+	return tmp
+}
+
+func (q *Queue) Peek() interface{} {
+    return q.queue[0]
+}
+
+func (q *Queue) Add(value interface{}) {
+	q.len += 1
+	q.queue = append(q.queue, value)
+} 

collections/queue/queue_test.go

@@ -0,0 +1,29 @@
+package queue
+
+import "testing"
+
+func Test_Queue(t *testing.T) {
+	queue := New()
+
+	queue.Add(1)
+	queue.Add(2)
+	queue.Add(3)
+
+	if queue.Length() != 3 {
+		t.Error("[Error] queue length is wrong")
+	}
+
+    element := queue.Remove()
+
+	if element != 1 {
+		t.Error("[Error] remove is wrong")
+	}
+
+	if queue.Length() != 2 {
+		t.Error("[Error] queue length is wrong after pop")
+	}
+
+	if queue.Peek() != 2 {
+		t.Error("[Error] queue Peek is wrong")
+	}
+}