npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

transduce-stream

v0.5.0

Published

Transform Stream with Transducers

Downloads

130

Readme

Transduce Stream

Build Status

Transform Node.js streams with transducers.

Works with transducers-js or transducers.js or transduce.

var stream = require('transduce-stream')

var transducer = // create transducer with transduce, transducers-js or transducers.js

process.stdin.resume()
process.stdin.pipe(stream(transducer)).pipe(process.stdout)

Example:

var stream = require('./'),
    tr = require('transduce') // or transducers-js or transducers.js

var trans = tr.compose(
  tr.string.words(),
  tr.map(function(x){return (+x * +x) + ' '}),
  tr.array.push('\n'))

process.stdin.resume()
process.stdin.pipe(stream(trans)).pipe(process.stdout)

Run to get the squares of numbers passed on stdin.

$ echo '1 12 7 41' | node square.js
1 144 49 1681

This example makes use of transduce/array to add a new line at the end of the stream and transduce/string to split the input on words (can also split on lines, chars and separators or RegExps).

Or using underarm.

// test.js
var _r = require('underarm')
    stream = require('transduce-stream')

var transducer = _r()
  .words()
  .map(function(x){return (+x * +x)+ ' '})
  .uniq()
  .take(4)
  .push('\n')
  .compose()

process.stdin.resume()
process.stdin.pipe(stream(transducer)).pipe(process.stdout)

Run this from the terminal to calculate a formatted sequence of the first 4 unique squared values.

$ echo '33 27 33 444' | node test.js
 1089  729  197136

$ node test.js << EOT
12 32
33 33
33 43
12 33 12
EOT
 144  1024  1089  1849