emilbayes

Koa is based on generators which are a new feature in ES6. The syntax for a generator is function* fnName() {} where fnName is optional, just as with normal functions. What generators allow one to do is effectively to suspend execution and hand over the execution flow to the calling function, which can then inject data into the generator. This is exploited to make async calls seem sync. Example:

function *() {
   var data = yield db.find(); //yield suspends execution and hands over the control flow

   data.map(someMapper);
}

As you can see we can pretend the async function db.find is sync, because the caller takes care of executing the function for us and can inject the response into the variable data. That's the high level overview of generators. How they actually work is another story but nothing you need to worry about at first. ES6 (also known as Harmony) features are not enabled by default so when running node, use the harmony flag: node --harmony index.js

emilbayes

#Copy 2.1GB
DATASIZE=$(echo '2^31' | bc)
dd if=/dev/zero bs=$DATASIZE count=1 | nc [HOST] 2222

emilbayes

'use strict';

/**
 * "64-bit" means unsinged 64-bit integer, contained in Uint32Array(2) in
 * Big Endian order
 */
module.exports = {
   //Arithmetic

   /**

emilbayes

var KMeans = require('kmeans-js');
var getPixels = require('canvas-pixels');
var document = require('global/document');
var img = require('img');

var canvas = document.createElement('canvas'),
    context = canvas.getContext('2d');

img('https://www.npmjs.org/static/img/npm.png', function(err, el) {
  canvas.width = el.width;

emilbayes

root = true

# Unix-style newlines with a newline ending every file
[*]
end_of_line = lf
insert_final_newline = true
trim_trailing_whitespace = true
charset = utf-8
indent_style = space
indent_size = 2

emilbayes

language: node_js
node_js:
- '0.11'
notifications:
  email: false
deploy:
  - provider: heroku
    api_key:
      secure: ...
    app: some-app

emilbayes

var stream = require('stream');
var messageStream = require('./message-stream');

var jsonify = new stream.Transform({
  writableObjectMode: true,
  transform: function(chunk, enc, cb) {
    this.push(JSON.stringify(chunk, null, 2) + '\n');
    cb();
  }
});

emilbayes

'use strict';
exports.get = function(document, pointer) {
  //Empty pointer references the whole document
  if(pointer === '') return document;

  //Split the pointer into reference tokens and unescape
  var referenceTokens = pointer.slice(1).split('/').map(unescape);

  //Decent down the object iteratively
  return referenceTokens.reduce(function(object, token) {

emilbayes

{
  "name": "minimal-protected-server",
  "version": "0.0.0",
  "description": "Minimal password protected server",
  "main": "server.js",
  "dependencies": {
    "basic": "0.0.3",
    "st": "^0.5.3"
  }
}

emilbayes

var stream = require('stream');

var outer = 0, inner = 0;

var collectorStream = stream.Readable({
  highWaterMark: 1,
  objectMode: true,
  read: function() {
    var self = this;
    var id1 = outer++;