1. What is different Between const, let, var
2. What is closure
3. In what order will this code execute:
console.log('1');
setTimeout(function() {
    console.log('2');
})
console.log('3');
setTimeout(function() {
console.log('4')
}, 200);

4. What will happen if we execute this code:
var food = 'Hamburger';
var food = 'Pizza'
let city = 'Boston'
let city = 'San Diego'
console.log(food);
console.log(city);

5. What is IIFE Functions?

6. What will this print:
var obj = {
    city: 'Sarajevo',
  getCity:() => {
    console.log(this.city)
  }
}

obj.getCity();