ES6 private property example with Symbol

Author: loiane

chapter03/01-Stack2.js

@@ -0,0 +1,40 @@
+let _items = Symbol();
+
+class Stack2 {
+
+    constructor () {
+        this[_items] = [];
+    }
+
+    push(element){
+        this[_items].push(element);
+    };
+
+    pop(){
+        return this[_items].pop();
+    };
+
+    peek(){
+        return this[_items][this[_items].length-1];
+    };
+
+    isEmpty(){
+        return this[_items].length == 0;
+    };
+
+    size(){
+        return this[_items].length;
+    };
+
+    clear(){
+        this[_items] = [];
+    };
+
+    print(){
+        console.log(this[_items].toString());
+    };
+
+    toString(){
+        return this[_items].toString();
+    };
+}