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Code Smells in Objective-C

Code smells. I’ve mentioned “code smells” at work, only to discover that my coworkers didn’t know what I meant. It’s basically a diaper-changing metaphor: “If it stinks, change it.”

A code smell isn’t “awful code that makes you hold your nose.” Rather, it’s a simple indication that something may need to be changed. Quite often, you won’t notice a code smell until someone else describes it. This is what Kent Beck and Martin Fowler did in the Refactoring book: created a list of smells, and what to do about them.

Code Smells Specific to Objective-C

The book’s catalog of code smells relate to good practices of object-oriented programming. I’m going to start a series that is specific to Objective-C code smells. Here’s a tentative list to give you a preview:

  1. 9 Code Smells of Xcode Preprocessor Macros
  2. #imports Gone Wild! How to Tame File Dependencies
  3. 4 Ways Precompiled Headers Cripple Your Code
  4. Is Dot Notation in Objective-C 100% Pure Evil?
    …or maybe not! I switched, see In Which I Embrace Dot Notation…
  5. Objective-C init: Why It’s Helpful to Avoid Messages to self

I think this’ll be interesting, and sometimes even controversial. (Dot notation, anyone?) So be sure to come back — subscribe to keep up with the latest postings!

Other resources:

Question: What common Objective-C practices have you encountered that you might consider code smells? Leave a comment below.

About the Author Jon Reid

Programming was fun when I was a kid. But working in Silicon Valley, I saw poor code lead to fear, with real human costs. Looking for ways to make my life better, I learned about Design Patterns, Refactoring, and Test-Driven Development (TDD). Programming became fun again! I've now been doing TDD in Apple environments for 18 years. I'm committed to software crafting as a discipline, hoping we can all reach greater effectiveness and joy.

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Disclosure: The links below are affiliate links. If you buy anything, I earn a commission, at no extra cost to you.

  • Cory Wheeler says:

    Hi Jon,
    I think you’ve picked a great topic here. I know that there will be things that I will be able to learn from. I look forward to your next post.
    Take care,
    Cory

  • Jon,
    I’m looking forward to your series. You have me curious about #4 :-)
    Doug

  • Eimantas says:

    Just after reading that “Preprocessor use” may cause code smell I became instantly intrigued. Would you mind giving me a hint of what that might be?

  • Mayur says:

    Hi Jon,
    Great topic!!.
    Looking forward to your next post. – Mayur

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