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In favor of the singleton

A short and very enjoyable read by Uncle Bob on singletons:

Do you recognize this:

public class X {
  private static X instance = null;

  private X() {}

  public static X instance() {
    if (instance == null)
      instance = new X();
    return instance;

  // more methods...

Of course. That’s the Singleton pattern from the GOF book. I’ve always heard we shouldn’t use it.

Why shouldn’t we use it?

Because it makes our systems hard to test.

It does? Why is that?


You can read the whole conversation on http://blog.cleancoder.com/uncle-bob/2015/07/01/TheLittleSingleton.html

Freek Van der Herten is a partner and developer at Spatie, an Antwerp based company that specializes in creating web apps with Laravel. After hours he writes about modern PHP and Laravel on this blog. When not coding he’s probably rehearsing with his kraut rock band. He loves waffles and butterflies.