reword

Author: shadowcodex

lib/stacks.js

@@ -1,15 +1,15 @@
 class Stack {
     constructor () {
-        this.head = {};        
+        this.top = {};        
         this.length = 0;
     }
 
     push(data) {
         let node = {
             value: data,
-            prev: this.head
+            prev: this.top
         };
-        this.head = node;
+        this.top = node;
         this.length++;
         return this.length;        
     }
@@ -19,14 +19,14 @@ class Stack {
             return undefined;
         }
 
-        let value = this.head.value;
-        this.head = this.head.prev;
+        let value = this.top.value;
+        this.top = this.top.prev;
         this.length--;
         return value;        
     }
 
     peek() {
-        return this.head.value;
+        return this.top.value;
     }
 
     height() {