example1.js

// define a function that increments a counter in a loop
function closureExample() {
 
    var i = 0;
 
    for (i = 0; i< 3 ;i++) {    
        setTimeout(function() {
            console.log('counter value is ' + i);
        }, 1000);
    }
 
}
// call the example function
closureExample(); 

example2.js

// define a function that increments a counter in a loop
function closureExample() {
  
  var i = 0;
  
  for (i = 0; i< 3 ;i++) {
    (function (count) {
      setTimeout(function() {
        console.log('counter value is ' + count);
      }, 1000);
    }(i));
  }
  
}

// call the example function
closureExample();