bradtraversy · May 29, 2020 14:35 · May 29, 2020
diff --git a/stack.js b/stack.js
@@ -0,0 +1,83 @@
+class Stack {
+    constructor() {
+        this.items = []
+        this.count = 0
+    }
+
+    // Add element to top of stack
+    push(element) {
+        this.items[this.count] = element
+        console.log(`${element} added to ${this.count}`)
+        this.count += 1
+        return this.count - 1
+    }
+
+    // Return and remove top element in stack
+    // Return undefined if stack is empty
+    pop() {
+        if(this.count == 0) return undefined
+        let deleteItem = this.items[this.count - 1]
+        this.count -= 1
+        console.log(`${deleteItem} removed`)
+        return deleteItem
+    }
+
+    // Check top element in stack
+    peek() {
+        console.log(`Top element is ${this.items[this.count - 1]}`)
+        return this.items[this.count - 1]
+    }
+
+    // Check if stack is empty
+    isEmpty() {
+        console.log(this.count == 0 ? 'Stack is empty' : 'Stack is NOT empty')
+        return this.count == 0
+    }
+
+    // Check size of stack
+    size() {
+        console.log(`${this.count} elements in stack`)
+        return this.count
+    }
+
+    // Print elements in stack
+    print() {
+        let str = ''
+        for(let i = 0; i < this.count; i++) {
+            str += this.items[i] + ' '
+        }
+        return str
+    }
+
+    // Clear stack
+    clear() {
+        this.items = []
+        this.count = 0
+        console.log('Stack cleared..')
+        return this.items
+    }
+}
+
+const stack = new Stack()
+
+stack.isEmpty()
+
+stack.push(100)
+stack.push(200)
+
+stack.peek()
+
+stack.push(300)
+
+console.log(stack.print())
+
+stack.pop()
+stack.pop()
+
+stack.clear()
+
+console.log(stack.print())
+
+stack.size()
+
+stack.isEmpty()