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| function asyncForeach(array, fn, callback) { | |
| var completed = 0; | |
| var arrayLength = array.length; | |
| if(arrayLength === 0) { | |
| callback(); | |
| } | |
| for(var i = 0; i < arrayLength; i++) { | |
| fn(array[i], i, function() { | |
| completed++; | |
| if(completed === arrayLength) { | |
| callback(); | |
| } | |
| }); | |
| } | |
| } | |
| asyncForeach([1, 2, 3], function(item, index, next_cb) { | |
| setTimeout(function() { | |
| console.log(item) | |
| }, item * 100); | |
| setTimeout(next_cb, 100); | |
| }, function() { | |
| console.log('end'); | |
| }); |
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