Why not use recursive functions?
var a = getInitialData();
function doSomething(el, i) {
if(i < a.length) {
/* do something non-blocking here*/
doSomething(a[i+1], i+1);
}
}
doSomething(a[0], 0);
On Sat, Sep 15, 2012 at 12:00 AM, dhruvbird <[email protected]> wrote:
> Hello Maxim,
>
> The real reason jslint gives you a warning is if you were to use the loop
> variable "i" within the function in the closure, you would always get the
> value of i to be a.length (assuming that the function isn't evaluated
> synchronously and that you don't have another function declared within the
> first one).
>
> The code as you have shown seems to be perfectly safe to use though.
>
> I wouldn't worry too much about the performance unless you profile it and
> determine it to be a bottleneck.
>
> Regards,
> -Dhruv.
>
>
> On Thursday, September 13, 2012 2:00:42 AM UTC-4, Maxim Kazantsev wrote:
>>
>> 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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