Glen Scott – Keeping it simple

Singletons and global state

August 27, 2008 by Glen. Filed under programming.

A very useful article from Google’s Miško Hevery about the problems with the Singleton design pattern. Essentially, Singleton’s rely on a global instance variable which could point to any number of other variables, thus creating a global state. This causes problems when you want to test your code.

• Root Cause of Singletons
• Top 10 things which make your code hard to test

Tags: design, pattern, programming, singletons, testing

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