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matthewmueller / gen.js
Last active Aug 29, 2015
understanding generators
View gen.js
* Excerpt from: Analysis of generators and other async patterns in node
* URL:
* When next is invoked, it starts the execution
* of the generator. The generator runs until it
* encounters a yield expression. Then it pauses
* and the execution goes back to the code that
* called next.
matthewmueller /
Last active Aug 29, 2015
Some quick notes on flow-based programming

Flow-based Programming is all about reacting to event sources. Event sources in the browser might be:

  • A DOM event
  • AJAX call
  • Onload initial data passing
  • Local DB fetch (local storage, indexdb)

In order to build larger systems, nodes need to be chainable and flows need to be composable. I think the best way to do this in Javascript may look something like this:

matthewmueller / gulpnduo.js
Last active Aug 29, 2015
Duo gulp integration
View gulpnduo.js
* Module Dependencies
var debug = require('debug')('lapwing:build');
var relative = require('path').relative;
var resolve = require('path').resolve;
var extname = require('path').extname;
var uglify = require('gulp-uglify');
var Batch = require('better-batch');
View flow.js
function *something(msg) {
msg += yield msg; // yields "a", returns "b"
msg += yield msg; // yields "ab", returns "c"
msg += yield msg; // yields "abc", returns "d"
return msg; // returns "abcd"
var gen = something('a');
console.log(; // a
console.log('b').value); // ab

Keybase proof

I hereby claim:

  • I am matthewmueller on github.
  • I am matthewmueller ( on keybase.
  • I have a public key whose fingerprint is BFED 49E4 15E0 9C6E C008 3E7F 490F 7168 F0D0 85EB

To claim this, I am signing this object:

matthewmueller / inject.js
Created May 1, 2015
Testing injection mad science
View inject.js
var script = document.currentScript;
var sheet = script.getAttribute('sheet');
var el = document.createElement('div');
el.textContent = 'hi world!';
script.parentNode.replaceChild(el, script);
matthewmueller / promise.js
Last active Aug 29, 2015
Runthrough of Promise control flow
View promise.js
var a = new Promise(function (resolve, reject) {
function b_success() {
console.log('b: success', err);
// not called...
matthewmueller / Underscore templating with Express
Created Mar 25, 2011
Javascript: Use underscore templating to parse HTML files in Express
View Underscore templating with Express
// Express with Underscore templating
app.register('.html', {
compile : function(str, options) {
return function(locals) {
return _.template(str, locals);
matthewmueller / gist:2018660
Created Mar 11, 2012
Javascript: step(fns...) - Tiny, flexible step function for running async functions in series
View gist:2018660
Step - tiny, but flexible step library
var first = function(next) {
return next(null, name, date);
matthewmueller / gist:2018609
Created Mar 11, 2012
Javascript: after(len) - counter used for async iteration
View gist:2018609
Counter used for async calls
var files = ['a', 'b'];
finished = after(files.length);
finished() // false
finished() // true
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