constantTimeStackMin.js

/**
 * Write a stack using your preferred instantiation pattern. Implement a min function
 * that returns the minimum value of all the elements in the stack in constant time.stack.  
 * All of the functions in the Stack should run in constant time!
 *
 * var example = new Stack()
 *  example.push(4)
 *  example.push(3)
 *  example.min() === 3
 *  example.push(3)
 *  example.push(2)
 *  example.push(2)
 *  example.min() === 2
 */

/**
  * Stack Class
  */
  var Stack = function() {

    this.storage = [];

  // add an item to the top of the stack
    this.push = function(value) {
      this.storage.push(value);
      console.log(this.storage);
    };

  // remove an item from the top of the stack
    this.pop = function() {
      return this.storage.pop();
    };

  // return the number of items in the stack
    this.size = function() {
      return this.storage.length;
    };
  
  // return the minimum value in the stack
    this.min = function() {
      var minimum = this.storage[0];
      for(var i = 0; i <= this.storage.length; i++){
        if(minimum > this.storage[i]){
        minimum = this.storage[i];
    }
  }
  return minimum; 
    };

  };