How to avoid access mutable variable from closure

Question

I have some code like this:

for(var id=0; id < message.receiver.length; id++){
   var tmp_id = id;
   zlib.gzip(JSON.stringify(message.json), function(err         


        

Answer 1

@user24359 answer is a good solution but you can simply replace the var keyword by the let keyword.

for(var id=0;

becomes

for(let id=0;

See details here.

Edit : As Heriberto Juárez suggested it, it will only works for browsers that supports EcmaScript6.