Stack implementation in JS using class and constructor

stack.js

'use strict'

let Stack  = function(max){
  this.Store = [];
  this.top = 0;

  if(typeof max == 'number' && max != NaN){
    this.max = max
  }else{
    throw new Error(max + ' should be a number');
  }
}

Stack.prototype.empty = function() { return this.top === 0 } 
Stack.prototype.full = function(){ return this.top === this.max}

Stack.prototype.push =  function(ele){
  if(!this.full()){

    this.Store[this.top++] = ele;
  }else{
    throw new Error('Stack is overflow');
  }
}

Stack.prototype.pop =  function(){
  if(!this.empty()){
    this.Store.splice(this.top-- - 1,  1)
  }else{
    throw new Error('Stack is empty, there is no element to be popped');
  }
}

Stack.prototype.clear =  function(){
  this.Store =  [], this.top = 0;
}


//Get the top element of the stack
Stack.prototype.peek =  function(){
  if(!this.empty()){
    return this.Store[this.top -1 ];
  }
  throw new Error('Stack is empty, there is no element to be peeked');
}

Stack.prototype.toString =  function(){
  let i = 0;
  if(!this.empty()){
    for(i; i < this.top; i++){
      console.log(this.Store[i]);
    }
  }
}








//============ Using class definition ===============
class Stack{
  constructor(max){
    this.Store = [];
    this.top = 0;

    if(typeof max == 'number' && max != NaN){
      this.max = max
    }else{
      throw new Error(`${max} should be a number`);
    }
  }

  empty() {  return this.top === 0 } 
  full(){ return this.top === this.max}

  push(ele){
    if(!this.full()){

      this.Store[this.top++] = ele;
    }else{
      throw new Error('Stack is overflow');
    }
  }

  pop(){
    if(!this.empty()){
      this.Store.splice(this.top-- - 1,  1)
    }else{
      throw new Error('Stack is empty, there is no element to be popped');
    }
  }

  clear(){
    this.Store =  [], this.top = 0;
  }


  //Get the top element of the stack
  peek(){
    if(!this.empty()){
      return this.Store[this.top -1 ];
    }
    throw new Error('Stack is empty, there is no element to be peeked');
  }

  toString(){
    let i = 0;
    if(!this.empty()){
      for(i; i < this.top; i++){
        console.log(this.Store[i]);
      }
    }
  }
}