It is a pretty typical approach to use an anonymous function for
asynchronous calls from inside a loop:
var a = getInitialData();
> for (var i = 0, len = a.length; i < len; i++) {
> (function(el) {
> /* do something non-blocking here */
> })(a[i]);
> }
JSLint doesn't like this code with "Don't make functions within a loop"
warning, and it is actually right since it really creates a new anonymous
function on every single loop iteration. An obvious solution is to declare
this function outside a loop, but it would make a code less readable. Even
if a declaration would just precede the loop: you see a call here, you see
a declaration somewhere else, and here you are, lost all your attention.
My question is how bad this approach is for an overall performance? In
particular, how fast and efficient a garbage collection of anonymous
functions is? How much memory a typical anonymous function can consume and
how long it may exist in a memory?
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