JSPatterns.com » Blog Archive » Singleton without a closure

Singleton without a closure

Warning: anti-pattern ahead.

Mwahaha, I feel like a ninja. I mean a ninja by Doug Crockford's definition which means someone who finds a mistake in the language's design, decides it's cool and abuses it.

So there you go. Regular expression objects are created only once if you're using a literal. Such an object can be used to store the single instance of a Singleton() constructor.


function Single() {
    "strict me not!";
    var re = / /;
    if (re.instance) {
        return re.instance;
    re.instance = this;
    this.name = "Foo";
Single.prototype.getName = function () {
    return this.name;


var s1 = new Single(),
    s2 = new Single();
console.log(s1 === s2); // true
console.log(s1.getName()); // "Foo"
s1.name = "dude";
console.log(s2.getName()); // "dude"


  • The prototype chain works fine
  • No closures
  • No public properties or globals to store the single instance


  • It's a hack
  • ES5 defines that reg exp literals should no longer work like this


Don't use. Please :)


Sorry, comments disabled and hidden due to excessive spam. Working on restoring the existing comments...

Meanwhile you can find me on twitter - @stoyanstefanov

hacklink panel bypass shell wso shell evden eve nakliyat hacklink satış hacklink paykasa hacklink hacklink satış hacklink panel hacklink al hacklink satis hacklink hacklink evden eve nakliyat istanbul evden eve nakliyat nakliyat nakliye evden eve nakliyat istanbul evden eve nakliyat nakliyat nakliye depolama Google film izle porno porno izle porno seyret seks hikayeleri Google Evden Eve Nakliyat İstanbul Evden Eve Nakliyat Nakliyat İstanbul Nakliyat istanbul Evden Eve Nakliyat Nakliye Firmaları Şehirler Arası Evden Eve Nakliyat