function Gamburger(size, stuff, spiсes, mayo) {
    var SIZE = {
      small: {
        cost: 50,
        cal: 20
      },
      big: {
        cost: 100,
        cal: 40
      }
    };
 
    var STUFF = {
      cheese: {
        cost: 10,
        cal: 20
      },
      salad: {
        cost: 20,
        cal: 5
      },
      potato: {
        cost: 15,
        cal: 10
      }
    };
 
    var SPICES = {
      cost: 15,
      cal: 0
    };
 
    var MAYO = {
      cost: 20,
      cal: 5
    };
 
    var size = size.toLowerCase();
    var stuff = stuff.toLowerCase();
    //var spiсes = spiсes || undefined;
    //var mayo = mayo || undefined;
 
    function calc(value) { //calculate total cost OR total cals
      if (!checkValues()) return;
      var result = SIZE[size][value] + STUFF[stuff][value];
      if (spiсes) result += SPICES[value];
      if (mayo) result += MAYO[value];
      return result;
    }
 
    function checkValues() { //checking of arguments
      var checked = true;
      if (!(size in SIZE)) {
        console.log('Нет такого размера!');
        checked = false;
      }
      if (!(stuff in STUFF)) {
        console.log('Нет такой начинки!');
        checked = false;
      }
      return checked;
    }
 
    this.getCost = function() {
      return calc('cost');
    }
 
    this.getCals = function() {
      return calc('cal');
    }
 
  }
 
  var gamburger = new Gamburger('Small', 'salad', false, true);
  console.log(gamburger.getCost() + " " + gamburger.getCals());
 

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