Null object pattern (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Null object pattern" in English language version.

refsWebsite

Global rank English rank

6^th place

6^th place

67^th place

64^th place

apple.com (Global: 67^th place; English: 64^th place)

developer.apple.com

"Working with Objects (Working with nil)". iOS Developer Library. Apple, Inc. 2012-12-13. Retrieved 2014-05-19.

archive.org (Global: 6^th place; English: 6^th place)

Fowler, Martin (1999). Refactoring. Improving the Design of Existing Code. Addison-Wesley. ISBN 0-201-48567-2.
Martin, Robert (2002). Agile Software Development: Principles, Patterns and Practices. Pearson Education. ISBN 0-13-597444-5.