Fixed stack demo

buckyroberts · buckyroberts · commit c226b7562b95 · 2016-07-07T20:10:31.000-04:00
diff --git a/Data_Structures/Stacks/README.md b/Data_Structures/Stacks/README.md
@@ -1,8 +1,8 @@
 # Stacks
 
-A stack is a basic data structure that can be logically thought as linear structure represented by a real physical
-stack or pile, a structure where insertion and deletion of items takes place at one end called top of the stack. The
-basic concept can be illustrated by thinking of your data set as a stack of plates or books where you can only take the
-top item off the stack in order to remove things from it.
+A stack is a data structure that can be logically thought of as a real physical stack or pile, a structure where
+insertion and deletion of items takes place at one end only called the "top" of the stack. The basic concept can be
+illustrated by thinking of your data set as a stack of plates or books where you can only take the top item off the
+stack in order to remove things from it.
 
 ![](http://i.imgur.com/dax54C9.jpg)
diff --git a/Data_Structures/Stacks/main.js b/Data_Structures/Stacks/main.js
@@ -3,7 +3,7 @@
 function Stack() {
     let items = [];
 
-    // remove all items in the stack
+    // remove all items
     this.clear = function () {
         items = [];
     };
@@ -13,25 +13,30 @@ function Stack() {
         return items.length == 0;
     };
 
-    // return last item added to stack
+    // return last item added
     this.peek = function () {
         return items[items.length - 1];
     };
 
+    // remove last item from end
+    this.pop = function () {
+        return items.pop();
+    };
+
     // display all items
     this.print = function () {
         console.log(items.toString());
     };
 
-    // add item to end of stack
+    // add item to end
     this.push = function (element) {
         items.push(element);
     };
 
-    // remove last item from stack
-    this.pop = function () {
-        return items.pop();
-    }
+    // get size of stack
+    this.size = function () {
+        return items.length;
+    };
 
 }
 
@@ -42,7 +47,11 @@ buckysStack.push(87);
 buckysStack.push(29);
 buckysStack.push(71);
 buckysStack.print();
+
+console.log('--------------------');
+
 console.log(buckysStack.peek());
+console.log(buckysStack.size());
 
 console.log('--------------------');
 
