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Turtles all the way

Marc Harter wavded

Turtles all the way
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wavded / gen.js
Created Apr 23, 2014
TCO in Generators
View gen.js
function* fibGen (current, next) {
yield current
yield* fibGen(next, current + next)
for (var num of fibGen(0,1));
// function* fibGen (current, next) {
// ^
// RangeError: Maximum call stack size exceeded
View gist:3fd800289a1dff2b9b66
if (!this.props.isInitialized) {
return (
<EMap bingKey={this.props.bingKey} active={true} />
View proto_inheritance.js
// Prototypal Inheritance (this function will eventually be in the JavaScript language)
if (typeof Object.create !== 'function') {
Object.create = function(o) {
function F() {}
F.prototype = o;
return new f();
View xhtml_base.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "">
<html xmlns="" lang="en" xml:lang="en">
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
View singleton.js
var singleton = function() {
var privateVariable;
function privateFunction(x){
return {
firstMethod: function(a, b) {
secondMethod: function(a) {
View gist:252777
/* in few words:no round brackets=function or object, round brackets:anything, arguments.callee included.diff is the left assignment */
var a = function(){return 1}(); // 1
var b = function(){return {}}(); //object
function(){return 1}(); //error
function(){return {}}(); //error
var c = (function(){return arguments.callee})(); //function
var d = (function(){return []})(); //array
View gist:252771
evaluates as a block — "{" and "}" — containing one labeled statement — `a:"a"`.
labeled statement, in its turn, evaluates to "a".
evaluates as an expression, where "(" and ")" are grouping operator and "{" and "}" constitute an object literal.
evaluates to this object value.
View gist:253421
var a = {};
//to note: nothing is passed in and no private variables/functions/etc. on purpose
var b = (function(){
return {};
Is there any difference between a and b in regards to scope/execution? Any advantage one has over the other? (besides like arguments.callee/recursive stuff);
View geolocation.js
if (!navigator.geolocation) {
navigator.geolocation = (function (window) {
function getCurrentPosition(callback) {
// NOTE: for some reason, chaging the url is *allowed* with this service. Useful, but random
// source:
// The source is open source, as per:, but doesn't discuss specific license use. Hopefully it's just free to use - yay internet!
var geourl = '' + Math.random(),
iframe = document.createElement('iframe'),
doc, win;
View crockfordfacts.js
var sys = require("sys")
var http = require("http");
var twitter = http.createClient(80, "");
var count = 10
for (var i = 1; i <= count; i++) {
var request = twitter.request("GET", "/search.json?q=crockfordfact+OR+crockfordfacts&rpp=100&page=" + i, {"host": ""});
request.addListener('response', function(response) {
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