Using this as a way to show students about closures and scope

closure

for (var i = 1; i <=5; i++){
  setTimeout(function(){
    console.log("vaule of i is: " + i);
  },i*1000);
}


for (var i = 1; i <=5; i++){
  (function(i){
    setTimeout(function(){
    console.log("vaule of i is: " + i);
  },i*1000);
  })(i)
}


++++++++++++++++++++++++++++++++++++++
ES6 Way 
for (let i = 1; i <=5; i++){
  setTimeout(function(){
    console.log("vaule of i is: " + i);
  },i*1000);
}