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50 lines
2.5 KiB
Markdown
50 lines
2.5 KiB
Markdown
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[](https://travis-ci.org/#!/adaltas/node-stream-transform) [](https://www.npmjs.com/package/stream-transform) [](https://www.npmjs.com/package/stream-transform)
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Part of the [CSV module](https://csv.js.org/), this project is a simple object transformation framework. It implements the Node.js [`stream.Transform` API](http://nodejs.org/api/stream.html#stream_class_stream_transform). It also provides a simple callback-based API for convenience. It is both extremely easy to use and powerful.
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## Documentation
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* [Project homepage](http://csv.js.org/transform/)
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* [API](http://csv.js.org/transform/api/)
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* [Options](http://csv.js.org/transform/options/)
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* [Handler](http://csv.js.org/transform/handler/)
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* [State properties](http://csv.js.org/transform/state/)
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* [Examples](http://csv.js.org/transform/examples/)
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## Features
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* Extends the native Node.js [transform stream API](http://nodejs.org/api/stream.html#stream_class_stream_transform)
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* Simplicity with the optional callback and sync API
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* Pipe transformations between readable and writable streams
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* Synchronous versus asynchronous user functions
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* Sequential and parallel execution
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* Accept object, array or JSON as input and output
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* Sequential or user-defined concurrent execution
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* Skip and multiply records
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* Alter or clone input records
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* MIT License
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## Usage
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The module is built on the Node.js Stream API. For the sake of simplify, a simple callback API is also provided. To give you a quick look, here's an example of the callback API:
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```javascript
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var transform = require('stream-transform');
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input = [ [ '1', '2', '3', '4' ], [ 'a', 'b', 'c', 'd' ] ];
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transform(input, function(data){
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data.push(data.shift());
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return data.join(',')+'\n';
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}, function(err, output){
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output.should.eql([ '2,3,4,1\n', 'b,c,d,a\n' ]);
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});
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```
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## Development
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Tests are executed with mocha. To install it, simple run `npm install` followed by `npm test`. It will install mocha and its dependencies in your project "node_modules" directory and run the test suite. The tests run against the CoffeeScript source files.
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To generate the JavaScript files, run `npm run coffee`.
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The test suite is run online with [Travis](http://travis-ci.org/wdavidw/node-stream-transform). See the [Travis definition file](https://github.com/adaltas/node-stream-transform/blob/master/.travis.yml) to view the tested Node.js version.
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