xperiments

http://stackoverflow.com/questions/13407036/how-does-typescript-interfaces-with-construct-signatures-work

Construct signatures in interfaces are not implementable in classes; they're only for defining existing JS APIs that define a 'new'-able function. Here's an example involving interfaces new signatures that does work:

interface ComesFromString {
    name: string;
}

interface StringConstructable {
    new(n: string): ComesFromString;

xperiments

module x
{
	export class Singleton
	{
	    private static _instance : Singleton;
		constructor( singletonEnforcer:()=>void )
		{
			if( singletonEnforcer !== SingletonEnforcer )
			{
				throw new Error("Error: Instantiation failed: Use Singleton.getInstance() instead of new.");

xperiments

//http://stackoverflow.com/questions/15877362/declare-and-initialize-a-dictionary-in-typescript

interface IDictionary {
    add(key: string, value: any): void;
    remove(key: string): void;
    containsKey(key: string): bool;
    keys(): string[];
    values(): any[];
}

xperiments

var isOpera = !!window.opera || navigator.userAgent.indexOf(' OPR/') >= 0;
    // Opera 8.0+ (UA detection to detect Blink/v8-powered Opera)
var isFirefox = typeof InstallTrigger !== 'undefined';   // Firefox 1.0+
var isSafari = Object.prototype.toString.call(window.HTMLElement).indexOf('Constructor') > 0;
    // At least Safari 3+: "[object HTMLElementConstructor]"
var isChrome = !!window.chrome && !isOpera;              // Chrome 1+
var isIE = /*@cc_on!@*/false;                            // At least IE6

xperiments

The "trick" is to binary AND a value with 1.
Any odd number must have the first bit set to 1.

So

var foo = 7;

if( foo & 1 ) { // true }

Using a bitwise AND has a better performance in almost all platforms / browsers.

xperiments

// => http://stackoverflow.com/questions/17392349/how-can-i-check-if-element-is-an-instanceof-u

function OfType<T, U>(list: T[], arg: Function) : U[]
{
    var result: U[] = [];

    list.forEach(e => {
        // extract the name of the class
        // used to match primitive types
        var typeName = /function\s*([^(]*)/i.exec(arg+"")[1].toLocaleLowerCase();

xperiments

http://stackoverflow.com/questions/7370943/retrieving-binary-file-content-using-javascript-base64-encode-it-and-reverse-de
https://gist.github.com/jonleighton/958841
https://github.com/danguer/blog-examples/blob/master/js/base64-binary.js

xperiments

/*
Copyright (c) 2011, Daniel Guerrero
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the

xperiments

// Converts an ArrayBuffer directly to base64, without any intermediate 'convert to string then
// use window.btoa' step. According to my tests, this appears to be a faster approach:
// http://jsperf.com/encoding-xhr-image-data/5

function base64ArrayBuffer(arrayBuffer) {
  var base64    = ''
  var encodings = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'

  var bytes         = new Uint8Array(arrayBuffer)
  var byteLength    = bytes.byteLength

xperiments

function getBinary(file){
    var xhr = new XMLHttpRequest();
    xhr.open("GET", file, false);
    xhr.overrideMimeType("text/plain; charset=x-user-defined");
    xhr.send(null);
    return xhr.responseText;
}

function base64Encode(str) {
    var CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";