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Edit File : README.md \| Size : 2.54 KB
# from2 [![Flattr this!](https://api.flattr.com/button/flattr-badge-large.png)](https://flattr.com/submit/auto?user_id=hughskennedy&url=http://github.com/hughsk/from2&title=from2&description=hughsk/from2%20on%20GitHub&language=en_GB&tags=flattr,github,javascript&category=software)[![experimental](http://hughsk.github.io/stability-badges/dist/experimental.svg)](http://github.com/hughsk/stability-badges) # `from2` is a high-level module for creating readable streams that properly handle backpressure. Convience wrapper for [readable-stream](http://github.com/isaacs/readable-stream)'s `ReadableStream` base class, with an API lifted from [from](http://github.com/dominictarr/from) and [through2](http://github.com/rvagg/through2). ## Usage ## [![from2](https://nodei.co/npm/from2.png?mini=true)](https://nodei.co/npm/from2) ### `stream = from2([opts], read)` ### Where `opts` are the options to pass on to the `ReadableStream` constructor, and `read(size, next)` is called when data is requested from the stream. * `size` is the recommended amount of data (in bytes) to retrieve. * `next(err)` should be called when you're ready to emit more data. For example, here's a readable stream that emits the contents of a given string: ``` javascript var from = require('from2') function fromString(string) { return from(function(size, next) { // if there's no more content // left in the string, close the stream. if (string.length <= 0) return next(null, null) // Pull in a new chunk of text, // removing it from the string. var chunk = string.slice(0, size) string = string.slice(size) // Emit "chunk" from the stream. next(null, chunk) }) } // pipe "hello world" out // to stdout. fromString('hello world').pipe(process.stdout) ``` ### `stream = from2.obj([opts], read)` ### Shorthand for `from2({ objectMode: true }, read)`. ### `createStream = from2.ctor([opts], read)` ### If you're creating similar streams in quick succession you can improve performance by generating a stream constructor that you can reuse instead of creating one-off streams on each call. Takes the same options as `from2`, instead returning a constructor which you can use to create new streams. ### See Also - [from2-array](https://github.com/binocarlos/from2-array) - Create a from2 stream based on an array of source values. - [from2-string](https://github.com/yoshuawuyts/from2-string) - Create a stream from a string. Sugary wrapper around from2. ## License ## MIT. See [LICENSE.md](http://github.com/hughsk/from2/blob/master/LICENSE.md) for details. Back

Edit File : README.md | Size : 2.54 KB

# from2 [![Flattr this!](https://api.flattr.com/button/flattr-badge-large.png)](https://flattr.com/submit/auto?user_id=hughskennedy&url=http://github.com/hughsk/from2&title=from2&description=hughsk/from2%20on%20GitHub&language=en_GB&tags=flattr,github,javascript&category=software)[![experimental](http://hughsk.github.io/stability-badges/dist/experimental.svg)](http://github.com/hughsk/stability-badges) #

`from2` is a high-level module for creating readable streams that properly handle backpressure.

Convience wrapper for
[readable-stream](http://github.com/isaacs/readable-stream)'s `ReadableStream`
base class, with an API lifted from
[from](http://github.com/dominictarr/from) and
[through2](http://github.com/rvagg/through2).

## Usage ##

[![from2](https://nodei.co/npm/from2.png?mini=true)](https://nodei.co/npm/from2)

### `stream = from2([opts], read)` ###

Where `opts` are the options to pass on to the `ReadableStream` constructor,
and `read(size, next)` is called when data is requested from the stream.

* `size` is the recommended amount of data (in bytes) to retrieve.
* `next(err)` should be called when you're ready to emit more data.

For example, here's a readable stream that emits the contents of a given
string:

``` javascript
var from = require('from2')

function fromString(string) {
  return from(function(size, next) {
    // if there's no more content
    // left in the string, close the stream.
    if (string.length <= 0) return next(null, null)

// Pull in a new chunk of text,
    // removing it from the string.
    var chunk = string.slice(0, size)
    string = string.slice(size)

// Emit "chunk" from the stream.
    next(null, chunk)
  })
}

// pipe "hello world" out
// to stdout.
fromString('hello world').pipe(process.stdout)
```

### `stream = from2.obj([opts], read)` ###

Shorthand for `from2({ objectMode: true }, read)`.

### `createStream = from2.ctor([opts], read)` ###

If you're creating similar streams in quick succession you can improve
performance by generating a stream **constructor** that you can reuse instead
of creating one-off streams on each call.

Takes the same options as `from2`, instead returning a constructor which you
can use to create new streams.

### See Also

- [from2-array](https://github.com/binocarlos/from2-array) - Create a from2 stream based on an array of source values.
- [from2-string](https://github.com/yoshuawuyts/from2-string) - Create a stream from a string. Sugary wrapper around from2.

## License ##

MIT. See [LICENSE.md](http://github.com/hughsk/from2/blob/master/LICENSE.md) for details.

Back