c# ean 13 check Statement Level Refactorings in C#.NET

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Statement Level Refactorings
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Decompose a boolean expression Simplify a boolean expression by introducing well-named intermediate variables that help document the meaning of the expression. Move a complex boolean expression into a well-named boolean function If the expression is complicated enough, this can improve readability. If the expression is used more than once, it eliminates the need for parallel modifications and reduces the chance of error in using the expression.
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24. Refactoring
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Consolidate fragments that are duplicated within different parts of a conditional If you have the same lines of code repeated at the end of an else block that you have at the end of the if block, move those lines of code so that they occur after the entire if-then-else block. Use break or return instead of a loop control variable If you have a variable within a loop like Done that s used to control the loop, use break or return to exit the loop instead. Return as soon as you know the answer instead of assigning a return value within nested if-then-else statements Code is often easiest to read and least error prone if you exit a routine as soon as you know the return value. The alternative of setting a return value and then unwinding your way through a lot of logic can be harder to follow. Replace conditionals with polymorphism (especially repeated case statements) Much of the logic that used to be contained in case statements in structured programs can instead be baked into the inheritance hierarchy and accomplished through polymorphic routine calls instead. Create and use null objects instead of testing for null values Sometimes a null object will have generic behavior or data associated with it, such as referring to a resident whose name is not known as occupant. In this case, consider moving the responsibility for handling null values out of the client code and into the class that is, have the Customer class define the unknown resident as occupant instead of having Customer s client code repeatedly test for whether the customer s name is known and substitute occupant if not.
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Routine Level Refactorings
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Extract a routine Remove inline code from one routine and turn it into its own routine. Move a routine s code inline Take code from a routine whose body is simple and self-explanatory and move that routine s code inline where it is used. Convert a long routine to a class If a routine is too long, sometimes turning it into a class and then further factoring the former routine into multiple routines will improve readability. Substitute a simple algorithm for a complex algorithm Replace a complicated algorithm with a simpler algorithm.
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24. Refactoring
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Page 13
Add a parameter If a routine needs more information from its caller, add a parameter so that that information can be provided. Remove a parameter If a routine no longer uses a parameter, remove it. Separate query operations from modification operations Normally, query operations don t change an object s state. If an operation like GetTotals() changes an object s state, separate the query functionality from the state-changing functionality and provide two separate routines. Combine similar routines by parameterizing them Two similar routines might differ only with respect to a constant value that s used within the routine. Combine the routines into one routine and pass in the value to be used as a parameter. Separate routines whose behavior depends on parameters passed in If a routine executes different code depending on the value of an input parameter, consider breaking the routine into separate routines that can be called separately, without passing in that particular input parameter. Pass a whole object rather than specific fields If you find yourself passing several values from the same object into a routine, consider changing the routine s interface so that it takes the whole object instead. Pass specific fields rather than a whole object If you find yourself creating an object just so that you can pass it to a routine, consider modifying the routine so that it takes specific fields rather than a whole object. Encapsulate downcasting If a routine returns an object, it normally should return the most specific type of object it knows about. This is particularly applicable to routines that return iterators, collections, elements of collections, and so on.
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