js scopes in for loop

immediately invoked function

/**
* given expression
*/

var run = function(){
    
    var arr = [];
 
    for(var i = 0; i<=10; i++){
      arr.push(function(){
          alert(i); 
       });
   }
 
 
   for(var j = 0; j<=10; j++){
       arr[j]();
   }
 
}
run();

/* solution*/ 
var run = function(){
    
    var arr = [];
 
    for(var i = 0; i<=10; i++){
      arr.push(
          (function(k) {
          /* immediately invoked function pattern */ 
            return function() {
                alert(k);
            };
        })(i)
      );
   }
 
 
   for(var j = 0; j<=10; j++){
       arr[j]();
   }
 
}
run();