Javascript/Math: editing file name

Data-Structures/Queue/Queue.js

@@ -0,0 +1,80 @@
+/* Queue
+* A Queue is a data structure that allows you to add an element to the end of
+* a list and remove the item at the front. A queue follows a "First In First Out"
+* system, where the first item to enter the queue is the first to be removed. This
+* implementation uses an array to store the queue.
+*/
+
+// Functions: enqueue, dequeue, peek, view, length
+
+var Queue = (function () {
+  // constructor
+  function Queue () {
+    // This is the array representation of the queue
+    this.queue = []
+  }
+
+  // methods
+  // Add a value to the end of the queue
+  Queue.prototype.enqueue = function (item) {
+    this.queue[this.queue.length] = item
+  }
+
+  // Removes the value at the front of the queue
+  Queue.prototype.dequeue = function () {
+    if (this.queue.length === 0) {
+      throw new Error('Queue is Empty')
+    }
+
+    var result = this.queue[0]
+    this.queue.splice(0, 1) // remove the item at position 0 from the array
+
+    return result
+  }
+
+  // Return the length of the queue
+  Queue.prototype.length = function () {
+    return this.queue.length
+  }
+
+  // Return the item at the front of the queue
+  Queue.prototype.peek = function () {
+    return this.queue[0]
+  }
+
+  // List all the items in the queue
+  Queue.prototype.view = function () {
+    console.log(this.queue)
+  }
+
+  return Queue
+}())
+
+// Implementation
+var myQueue = new Queue()
+
+myQueue.enqueue(1)
+myQueue.enqueue(5)
+myQueue.enqueue(76)
+myQueue.enqueue(69)
+myQueue.enqueue(32)
+myQueue.enqueue(54)
+
+myQueue.view()
+
+console.log('Length: ' + myQueue.length())
+console.log('Front item: ' + myQueue.peek())
+console.log('Removed ' + myQueue.dequeue() + ' from front.')
+console.log('New front item: ' + myQueue.peek())
+console.log('Removed ' + myQueue.dequeue() + ' from front.')
+console.log('New front item: ' + myQueue.peek())
+myQueue.enqueue(55)
+console.log('Inserted 55')
+console.log('New front item: ' + myQueue.peek())
+
+for (var i = 0; i < 5; i++) {
+  myQueue.dequeue()
+  myQueue.view()
+}
+
+// console.log(myQueue.dequeue()); // throws exception!