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| -rw-r--r-- | intro.md | 4 |
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@@ -206,6 +206,10 @@ As of version 3.0, you can call any Async callback with `false` as the `error` a }, ``` +### Mutating collections + +If you pass an array to a collection method (such as `each`, `mapLimit`, or `filterSeries`), and then attempt to `push`, `pop`, or `splice` additional items on to the array, this could lead to unexpected or undefined behavior. Async will iterate until the original `length` of the array is met, and the indexes of items `pop()`ed or `splice()`d could already have been processed. Therefore, it is not recommended to modify the array after Async has begun iterating over it. If you do need to `push`, `pop`, or `splice`, use a `queue` instead. + ## Download |