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 <price.ti...@gmail.com> 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)
> })
>
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