If you just want to keep the stack from growing a simple while or for loop
is much easier.
var items = [1,2,3,4];
function forEach(items, worker) {
for (var i = 0, l = items.length; i < l; i++) {
worker(items[i], i, items);
}
}
forEach(items, function (value, index, array) {
});
or just use the built-in Array.prototype.forEach
items.forEach(function (value, index, array) {
});
I don't understand the goal. My example was assuming that worker was
non-blocking and called the callback in a new tick. It was parallel and
async.
On Wed, Apr 11, 2012 at 2:49 PM, Tim Price <[email protected]> wrote:
> I Wanted to keep the items in serially, as im trying to break the stack.
> Your asyncForEach is at the end of the day synchronous loop just like any
> other forloop.
>
> On Wednesday, April 11, 2012 3:33:18 PM UTC-4, Tim Caswell wrote:
>>
>> That depends on what you want it to do. This seems to execute each item
>> serially. You can do them all parallel and abort on the first error like
>> this:
>>
>> function asyncForEach(array, worker, callback) {
>> var len = array.length;
>> var results = new Array(l);
>> if (!len) return callback(null, results);
>> var left = len;
>> for (var i = 0; i < len; i++) {
>> start(i);
>> }
>> function start(i) {
>> worker(array[i], i, array, function (err, result) {
>> if (err) return callback(err);
>> results[i] = result;
>> if (!--left) callback(null, results);
>> });
>> }
>> }
>>
>>
>> On Wed, Apr 11, 2012 at 2:07 PM, Tim Price <[email protected]> wrote:
>>
>>> How would one better write this function?
>>>
>>> Array.prototype.forLoop = function(worker, callBack) {
>>> var self = this;
>>> var returnData = [];
>>> var loop = function(i) {
>>> if(i === self.length) {
>>> return callBack(returnData);
>>> }
>>> process.nextTick(function() {
>>>
>>> worker.call(self, self[i], function(d) {
>>>
>>> returnData.push(d);
>>> loop(++i);
>>> });
>>> });
>>> }
>>> loop(0);
>>> };
>>>
>>>
>>> and you would use it like so
>>>
>>>
>>> ['sdf', 'sdfsdf'].forLoop(function(**item, done) {
>>> console.log(item, done)
>>> done(item)
>>> }, function(result) {
>>> console.log(result)
>>> })
>>>
>>> --
>>> Job Board: http://jobs.nodejs.org/
>>> Posting guidelines: https://github.com/joyent/**node/wiki/Mailing-List-*
>>> *Posting-Guidelines<https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines>
>>> You received this message because you are subscribed to the Google
>>> Groups "nodejs" group.
>>> To post to this group, send email to [email protected]
>>> To unsubscribe from this group, send email to
>>> nodejs+unsubscribe@**googlegroups.com<nodejs%[email protected]>
>>> For more options, visit this group at
>>> http://groups.google.com/**group/nodejs?hl=en?hl=en<http://groups.google.com/group/nodejs?hl=en?hl=en>
>>>
>>
>> --
> Job Board: http://jobs.nodejs.org/
> Posting guidelines:
> https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines
> You received this message because you are subscribed to the Google
> Groups "nodejs" group.
> To post to this group, send email to [email protected]
> To unsubscribe from this group, send email to
> [email protected]
> For more options, visit this group at
> http://groups.google.com/group/nodejs?hl=en?hl=en
>
--
Job Board: http://jobs.nodejs.org/
Posting guidelines:
https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines
You received this message because you are subscribed to the Google
Groups "nodejs" group.
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/nodejs?hl=en?hl=en
