Do you enjoy conferences and workshops? I’m looking forward to attending, teaching, and speaking at these events in the fall of 2016…

Developing a Design Sense for Your Code

First up is something I’m attending. Continue Reading…

I learned how to write testable code in C++ and Objective-C. But what about Swift?

The features and the overall “feel” of a language can have a big impact on how we express our code. Many of you know this well, because you started Swift early, and are miles ahead of me. I’m delighted to play catch-up. Swift’s features are like new toys! …But how do they affect testability?

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When I began my TDD Sample App, my hope was that it would help us explore a number of topics around TDD and Clean Code.

On one hand, the app itself has barely progressed. However, the blog posts cover a surprising variety of topics.

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You face a problem with your code. Maybe something is bugging you about the design approach. Or maybe you’re just plain stuck. What can you do to break through a mental block?

"Free your mind" from any mental block

free your mind by justanotherhuman, used under CC BY-NC 2.0 / Cropped from original

During one job interview, I remember asking how the candidate approached problem solving. That candidate’s answer has stuck with me over the years: Continue Reading…

I’ve been unit testing view controllers for as long as I’ve worked in iOS. My screencast How to Do UIViewController TDD is for folks who want to do TDD, but couldn’t figure out how in a programming model centered around view controllers.

But for every person who wants to know how, there are others who question the whole idea. They wonder if unit testing view controllers is worth it at all. So this time let’s skip the “how” and focus on the “why”.

One reader asked me how to win over a team lead who is test-reluctant. The team lead wanted the reader to stop spending time writing unit tests for view controllers. “He questioned why I unit test UI when it seems to take a long time and does not seem necessary.” Continue Reading…

When a test fails, we want to know the location of the failure. Getting this information in Objective-C required us to dance with the preprocessor. But with Swift, it’s much more straightforward.

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Swift, here I come!

It’s time to start another version of the MarvelBrowser project. As I did with the Objective-C version, I begin the Swift version with a spike solution. But the first time was to see if I could satisfy Marvel’s authentication requirements. Basically, I needed to get the incantation correct. This time, I know the steps to take, but I will repeat them in Swift.

I have two goals:

  1. Make it work
  2. Make it Swifty

Could you give me feedback on the Swiftiness of my code? Continue Reading…

You spoke. The world is shifting. It’s time for Quality Coding to go Swift!

Better late than never.

Swift logo Continue Reading…

There’s been a growing debate about static languages vs. dynamic languages. For me, it started with Uncle Bob’s Type Wars, but it has expanded into many circles. Writing my own reaction helped me discover that I was unfairly judging Swift based on C++.

In the midst of the debate, another interesting article popped up: Eric Elliot’s The Shocking Secret About Static Types. It points to a couple of studies. One concludes that there is a lack of evidence that static typing reduces defect density. The other more rigorous paper concludes, “There is a small but significant relationship between language class and defects.”

Check out Eric’s fascinating conclusion:

When it comes to bug reduction, I think it's fair to say: Static types are overrated. But when it comes to other features, static types are still cool, and may still be worth using. Bottom line: You want to reduce bugs? Use TDD. You want useful cod intelligence tools? Use static types.

We’ve come full circle: a discussion about static types has again brought us back to TDD. Why?  Continue Reading…

I’ve been TDDing the “fetch characters” network request to the Marvel Comics API. But I’m anxious to see it work in a full round-trip to the actual Marvel server. Basically, I don’t want to go long without end-to-end feedback. How can I get the feedback I need to validate the current code?

Answer: Quickly hack together any way that works.

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