It doesn't matter whether it's Objective C, Java, or Lego Mindstorms ; if you are a developer you need to have a library of books you can refer to when the coding gets complicated. The Apple iOS developer is not immune from this requirement by any means.
There are many good books, ranging from beginner to advanced guru, on the market, so choosing what goes on your book shelf can be tricky. Here are a few that I would recommend.
Okay, that's an initial list, but I bet you have a favorite book on iOS development that isn't one of these five. What is it and how has it helped you? Be sure to add your vote to last week's poll, it will help us determine what to cover in this blog. Poll: Are you developing in-house iOS apps for your enterprise? This is a good time to go back and handle the skipped special cases.
This tests the expected result for 4 which is IV. In Roman numeral land, 4 is represented as 5 minus 1.
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In Converter. This code checks if the local input after 10 and 5 have been handled is greater than or equal to 4. It then appends the Roman numeral representation for 4 before decrementing the local input by 4. Recognizing duplicate code and cleaning it up, also known as refactoring, is an essential step in the TDD cycle. At the end of the previous section, a pattern emerged in the conversion logic. You should now be able to take your refactoring to its logical conclusion. This initializes numberSymbols with additional numbers and symbols.
It then replaces the previous code for each number with the generalized code you added to process Your converter has come a long way, but there are more cases you can cover. Start with the conversion for zero. That means, you can choose to throw an exception when this is passed or just return an empty string. This code adds mappings for the relevant numbers from 40 through 1, This also covers the test for 3, You now have a fully functioning Roman numeral converter.
In Game. Congratulations on rounding out Numero. You can download the final project by using the link at the top or bottom of this tutorial.
You now have an excellent idea of how TDD works. The other developers who work with your code will thank you for using TDD. This makes it useful beyond developing iOS apps. As long as that technology has a framework for writing unit tests, you can use TDD!
I hope you enjoyed this tutorial. If you have any comments or questions, please join the forum discussion below! Full access to the largest collection of Swift and iOS development tutorials anywhere!
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