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    parallel-transform
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    1.2.0 • Public • Published

    parallel-transform

    Transform stream for Node.js that allows you to run your transforms in parallel without changing the order of the output.

    npm install parallel-transform
    

    It is easy to use

    var transform = require('parallel-transform');
     
    var stream = transform(10, function(data, callback) { // 10 is the parallism level
        setTimeout(function() {
            callback(null, data);
        }, Math.random() * 1000);
    });
     
    for (var i = 0; i < 10; i++) {
        stream.write(''+i);
    }
    stream.end();
     
    stream.on('data', function(data) {
        console.log(data); // prints 0,1,2,...
    });
    stream.on('end', function() {
        console.log('stream has ended');
    });

    If you run the above example you'll notice that it runs in parallel (does not take ~1 second between each print) and that the order is preserved

    Stream options

    All transforms are Node 0.10 streams. Per default they are created with the options {objectMode:true}. If you want to use your own stream options pass them as the second parameter

    var stream = transform(10, {objectMode:false}, function(data, callback) {
        // data is now a buffer
        callback(null, data);
    });
     
    fs.createReadStream('filename').pipe(stream).pipe(process.stdout);

    Unordered

    Passing the option {ordered:false} will output the data as soon as it's processed by a transform, without waiting to respect the order.

    License

    MIT

    Install

    npm i parallel-transform

    DownloadsWeekly Downloads

    9,773,962

    Version

    1.2.0

    License

    MIT

    Unpacked Size

    5.54 kB

    Total Files

    4

    Last publish

    Collaborators

    • mafintosh