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Pedro Casaubon xperiments

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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();
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.
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
@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[];
}
@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 / 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;
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