JavaScript-Interview-Question/Stack.js at master · namitmalasi/JavaScript-Interview-Question · GitHub

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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 position ${this.count}`);

this.count++;

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 deletedItem = this.items[this.count - 1];

this.count--;

console.log(`${deletedItem} removed`);

return deletedItem;

}

// Check top element in Stack

peek() {

console.log(`The top element is ${this.items[this.count - 1]}`);

let peekedItem = this.items[this.count - 1];

return peekedItem;

}

// 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} element in stack `);

return this.count;

}

// print elements of stack

print() {

let str = "";

for (let i = 0; i < this.count; i++) {

str = str + this.items[i] + " ";

}

return str;

}

clear() {

this.items = [];

this.count = 0;

console.log("Stack cleared");

return this.items;

}

const stack = new Stack();

stack.isEmpty();

stack.push(10);

stack.push(20);

stack.push(30);

stack.push(40);

stack.pop();

stack.isEmpty();

stack.peek();

console.log(stack.print());

JavaScript-Interview-Question/Stack.js at master · namitmalasi/JavaScript-Interview-Question · GitHub

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