feat: add Size func for PriorityQueue

datastructure/queue/priorityqueue.go

@@ -29,6 +29,11 @@ func (q *PriorityQueue[T]) IsEmpty() bool {
 	return q.size == 0
 }
 
+// Size get number of items in the queue
+func (q *PriorityQueue[T]) Size() int {
+	return q.size
+}
+
 // IsFull checks if the queue capacity is full or not
 func (q *PriorityQueue[T]) IsFull() bool {
 	return q.size == len(q.items)-1

datastructure/queue/priorityqueue_test.go

@@ -52,9 +52,13 @@ func TestPriorityQueue_Dequeue(t *testing.T) {
 		pq.Enqueue(i)
 	}
 
+	assert.Equal(10, pq.Size())
+
 	val, ok := pq.Dequeue()
 	assert.Equal(true, ok)
 	assert.Equal(10, val)
 
 	assert.Equal([]int{9, 8, 6, 7, 3, 2, 5, 1, 4}, pq.Data())
+
+	assert.Equal(9, pq.Size())
 }