This method is mixing at least two levels of abstraction. The first is the notion that a horizontal rule has a size. This code comes from the HruleWidget module in FitNesse. This module detects a row of four or more dashes and converts it into the appropriate HR tag. Perhaps the programmer had plopped the VariableExpandingRootWidget into AliasLinkWidget as a matter of convenience, or perhaps he thought that it really needed to be scoped inside AliasLinkWidget. Whatever the reason, the result wound up being arbitrary. Public classes that are not utilities of some other class should not be scoped inside another class.
- Therefore, HTML determines the structural properties of your sites, such as the location of your headlines, placement of headings, bullet lists, etc.
- Tags help them organize content into logical parts, resulting in coherent structures.
- Secondly, we have the back-end developers that work under the hood.
- As a client, you won’t necessarily notice their handy work.
This was my first attempt at separating the abstraction levels in the HruleWidget.render method. Note that I changed the name of the size field to reflect its true purpose.
This points out that when you break a function along lines of abstraction, you often uncover new lines of abstraction that were obscured by the previous structure. Separating levels of abstraction is one of the most important functions of refactoring, and it’s one of the hardest to do well.
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If I show you the code with well-chosen names, it will make perfect sense to you, but like this it’s just a hodgepodge of symbols and magic numbers. Remember that meanings tend to drift as software evolves, so frequently reevaluate the appropriateness of the names you choose. The configuration constants reside at a very high level and are easy to change. The lower levels of the application do not own the values of these constants. My goal, at this point, was to create the necessary the necessary separation and get the tests to pass. I accomplished that goal easily, but the result was a function that still had mixed levels of abstraction. In this case the mixed levels were the construction of the HR tag and the interpretation and formatting of the size variable.
Which you choose depends upon whether the ambiguity is about something that would compile or not. They are easy to write and their documentary value is higher than the code to produce them. Unfortunately, the metric many programmers use is “That seems like enough”. A test suite should test everything that could possible break. The tests are insufficient so long as there are conditions that have not been explored by the tests or calculation that have not been validated. Names should not be encoded with type of scope information.
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Prefixes such as m_ or f are useless in today’s environments. Also project and/or subsystem encodings such as vis_ are distracting and redundant. Again, today’s environments provide all that information without having to mangle the names. This snippet is actually less complete than the one above. Yet you can infer immediately what it is trying to do, and you could very likely write Fortnite Battle Royale – Chapter 2 for Windows the missing functions based on that inferred meaning. That magic numbers are no longer magic, and the structure of the algorithm is compellingly descriptive.