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@xperiments
xperiments / NewableTypes.ts
Created Jun 20, 2013
Typescript Newable Types
View NewableTypes.ts
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
xperiments / Singleton.ts
Created Jun 25, 2013
Typescript Singleton
View Singleton.ts
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
xperiments / Dictionary.ts
Created Jun 25, 2013
Typescript Dictionary
View Dictionary.ts
//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[];
}
View BrowserDetection.js
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
View OddNumber.js
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
xperiments / new_gist_file
Last active Feb 13, 2018
[[ts] Check if obj is instanceof U] Check if obj is instanceof U
View new_gist_file
// => 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
xperiments / xhr2base64
Created Jul 10, 2013
XHR => base64 => Binary
View xhr2base64
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
View base64-binary.js
/*
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
xperiments / ArrayBuffer2Base64.js
Last active Feb 13, 2018
[[js][utils][base64] ArrayBuffer2Base64] ArrayBuffer2Base64 #js #base64
View ArrayBuffer2Base64.js
// 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
View xhr2base64.js
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+/";
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