Not a bug, just wrap the scope that you want to use in a function call:
for (var i=0; i < array.length; i++) (function(i){
var item = array[i];
setTimeout(function() {
console.log(item);
}, 1000*i);
})(i);
Or use Array's forEach method which does this more compactly:
array.forEach(function(item, i){
setTimeout(function(item) {
console.log(item);
}, 1000*i);
}
It may not be intuitive (it's certainly confused me!), but if it worked the
way you suggest, there's be no way to read the current, completed iteration
of the for loop, instead of the closure'd value.
I wouldn't use the additional arguments functionality of
setInterval/setTimeout. If you do need it in the future, use a small
function closure (as above) or the .bind() method instead:
setTimeout(myfunc.bind(null, firstargument));
Or, use something else entirely:
var i = 0;
(function next(){
var item = items[i++];
if(item===undefined) return void done();
console.log(item);
setTimeout(next, 1000);
})();
Or:
function next(i){
var item = items[i];
if(item===undefined) return void done();
console.log(item);
next(i+1);
}
next(0);
On Thursday, July 11, 2013 7:42:25 AM UTC-7, Jean-Michel Hiver wrote:
>
> Funny how I scratched my head for an hour or so and found the answer
> afterwards:
>
> for (var i=0; i < array.length; i++) {
> var item = array[i];
> setTimeout(function(item) {
> console.log(item);
> }, 1000*i, *item*);
> }
>
> Still I think the way closures works is a bug...
>
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