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- # MapStream
-
- Refactored out of [event-stream](https://github.com/dominictarr/event-stream)
-
- ##map (asyncFunction[, options])
-
- Create a through stream from an asyncronous function.
-
- ``` js
- var map = require('map-stream')
-
- map(function (data, callback) {
- //transform data
- // ...
- callback(null, data)
- })
-
- ```
-
- Each map MUST call the callback. It may callback with data, with an error or with no arguments,
-
- * `callback()` drop this data.
- this makes the map work like `filter`,
- note:`callback(null,null)` is not the same, and will emit `null`
-
- * `callback(null, newData)` turn data into newData
-
- * `callback(error)` emit an error for this item.
-
- >Note: if a callback is not called, `map` will think that it is still being processed,
- >every call must be answered or the stream will not know when to end.
- >
- >Also, if the callback is called more than once, every call but the first will be ignored.
-
- ##Options
-
- * `failures` - `boolean` continue mapping even if error occured. On error `map-stream` will emit `failure` event. (default: `false`)
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