Stack.js

Stack.js

// Stack - 
//   Push - Add value at end
//   Pop - Remove and return the end of the stack
//   Peek - Return the end value of the stack
//   Size - Return the size

function Stack() {
  let count = 0;
  let storage = {};

  return {
    push: (value) => {
      storage[count] = value;
      count++;
    },
    pop: () => {
      count--;
      const poppedValue = storage[count];
      delete storage[count];
      return poppedValue;
    },
    peek: () => storage[count - 1],
    size: () => count,
  }
}

const myStack = Stack();
myStack.push(1);
myStack.push(2);
console.log('Peek: ', myStack.peek());
console.log('Pop: ', myStack.pop());
console.log('Peek: ', myStack.peek());