Javascript - how to work with the iterator in a for loop with callbacks

Question

I am trying in the for loop to access the value of the i with which the callback function uses.

How can I do this?

for (var i = 0; i < a.length; i         


        

Answer 1

for (var i = 0; i < a.length; i++) {

  function createCallback(i) {
    return function(response) {
      // i want here to have the current "i" here
    }
  }

  calcRoute(fixedLocation, my_cities[i].address, createCallback(i));
}