simple stack implementation

Author: rohan-paul

stack-data-structure/README.md renamed to Stack/README.md

@@ -0,0 +1,29 @@
+
+// Each data structure can be implemented by the different method. We can treat stack as a subclass of Array. So we take the array for example here.
+
+class Stack {
+
+    constructor() {
+        this.stack = []
+    }
+
+    push(item) {
+        this.stack.push(item)
+    }
+
+    pop (item) {
+        this.stack.pop(item)
+    }
+
+    peek (item) {
+        this.stack[this.getCount() - 1]
+    }
+
+    getCount() {
+        return this.stack.length
+    }
+
+    isEmpty() {
+        return this.stack.length === 0
+    }
+}