[Javascript] Advanced Function Scope

Something like 'for' or 'while', 'if', they don't create a new scope:

var ary = [,,];

for(var i = ; i < ary.length; i++){
  var greeting = "Hello";
  var times = i;
}

console.log(i); //
console.log(times); //
console.log(greeting); // Hello

Everyting written in for loop can be accessed outside the for loop.

So, the problem:

var ary = [,,];

for(var i = ; i < ary.length; i++){
  setTimeout( function(i){
    console.log(ary[i]); //undefined, becaues i = 3 always
  }, )
}

Solve the problem:

var ary = [,,];

for(var i = ; i < ary.length; i++){
  // Function do create scope
  (function(){
     // Remember i in j
     var j = i;
     setTimeout( function(){
       // So now each j is different
      console.log(ary[j]);
    }, )
  })();
}