karlpokus

testing core node modules with the REPL

The default evaluator will automatically load Node.js core modules into the REPL environment when used... https://nodejs.org/api/repl.html

$ node
> querystring.parse("")
{}

Easy peezy lemon sqeezy!

karlpokus

http://gsgd.co.uk/sandbox/jquery/easing/jquery.easing.1.3.js https://github.com/gdsmith/jquery.easing/blob/master/jquery.easing.js#L21

Relevant parts

// Preserve the original jQuery "swing" easing as "jswing"
$.easing['jswing'] = $.easing['swing'];

$.extend( $.easing,

karlpokus

#!/usr/bin/env node

// 1. add shebang above
// 2. make file executable
// $ chmod +x pipeToMe.js
// 3. pipe from file
// $ cat file | ./pipeToMe.js
// 4. pipe from echo
// $ echo -n one two | ./pipeToMe.js
// 5. just pass some args

karlpokus

• https://community.risingstack.com/the-definitive-guide-to-object-streams-in-node-js/

karlpokus

function secretary(people, weekNumber){
  var index = weekNumber % people.length;
  return people[index]; 
}

karlpokus

// http://stackoverflow.com/a/2117523/1983554
function createId() {
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'
    .replace(/[xy]/g, function(c) {
      var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
      return v.toString(16);
  });
}

karlpokus

https://nodejs.org/api/fs.html#fs_class_fs_stats

var ts = fs.statSync(file).mtime.getTime()

props

• atime - last access time (open by you or script)
• mtime - last modification to the file
• ctime - last modified metadata (chmod etc)

karlpokus

console.mute

usage

• readme

how does it work?

• node api - console
• console.js

some tests

karlpokus

Piping is fun!

unix

$ ls | grep test

ExpressJS

app.get('/', fn1, fn2, fn3); // or pass an array

karlpokus

interactive http://bl.ocks.org/abernier/3070589

node docs https://nodejs.org/api/url.html#url_url https://nodejs.org/api/http.html#http_http_request_options_callback

# protocol
http://www.foo.io/path/to/stuff?foo=bar&bar=5