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Reasons Not To Refactor
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In common parlance, refactoring is used loosely to refer to fixing defects, adding functionality, modifying the design essentially as a synonym for making any change to the code whatsoever. This common dilution of the meaning of the term is unfortunate. Change in itself is not a virtue. But purposeful change, applied with a teaspoonful of discipline, can be the key strategy that supports steady improvement in a program s quality under maintenance and prevents the all-too-familiar software-entropy death spiral.
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de Complete
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24. Refactoring
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Page 10
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In this section, I present a catalog of refactorings. Many of them are summaries of the more detailed descriptions presented in Refactoring (Fowler 1999). I have not, however, attempted to make this catalog exhaustive. In a sense, every example in this book that shows a bad code example and a good code example is a candidate for becoming a refactoring. In the interest of not repeating the entire 900 page book in this section, I ve tried to focus on the refactorings I personally have found most useful.
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Data Level Refactorings
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Replace a magic number with a named constant If you re using a numeric or string literal like 3.14, replace that literal with a named constant like PI. Rename a variable with a clearer or more informative name If a variable s name isn t clear, change it to a better name. The same advice applies to renaming constants, classes and routines, of course. Move an expression inline Replace an intermediate variable that was assigned the result of an expression with the expression itself. Replace an expression with a routine Replace an expression with a routine (usually so that the expression isn t duplicated in the code). Introduce an intermediate variable Assign an expression to an intermediate variable whose name summarizes the purpose of the expression. Convert a multi-use variable to multiple single-use variables If a variable is used for more than one purpose (common culprits are i, j, temp, and x), create separate variables for each usage, each of which has a more specific name. Use a local variable for local purposes rather than a parameter If an input-only routine parameter is being used as a local variable, create a local variable and use that instead. Convert a data primitive to a class If a data primitive needs additional behavior (including stricter type checking) or additional data, convert the data to an object and add the behavior you need. This
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de Complete
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24. Refactoring
Page 11
can apply to simple numeric types like Money and Temperature. It can also apply to enumerated types like Color, Shape, Country, or OutputType.
Convert a set of type codes to a class In older programs, it s common to see associations like
const int SCREEN = 0; const int PRINTER = 1; const int FILE = 2;
Rather than defining standalone constants, create a class so that you can receive the benefits of stricter type checking and set yourself up to provide richer semantics for OutputType if you ever need to.
Convert a set of type codes to a class with subclasses If the different elements associated with different types might have different behavior, then consider creating a base class for the type with subclasses for each type code. For the OutputType base class, you might create subclasses like Screen, Printer, and File. Change an array to an object If you re using an array in which different elements are different types, create an object that has a field for each former element of the array. Encapsulate a collection If a class returns a collection, having multiple instances of the collection floating around can create synchronization difficulties. Consider having the class return a read-only collection and provide routines to add and remove elements from the collection. Replace a traditional record with a data class Create a class that contains the members of the record. Creating a class allows you to centralize error checking, persistence, and other operations that concern the record.
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