Download Prefactoring: extreme abstraction; extreme separation; by Ken Pugh PDF

By Ken Pugh

Builders engaged on a venture will usually reconsider and recode the software program less than development to make its layout cleanser and extra dependent. often called "refactoring," this approach is completed for all types of purposes: to facilitate the addition of latest positive aspects, to enhance maintainability, and (or) to extend functionality. Refactoring is a crucial and beneficial software program process.Refactor adequate occasions notwithstanding, and you may start to examine issues that you should do whilst development new software program to lessen the quantity of refactoring later within the strategy. Taking those lessons-learned and using them on next improvement initiatives is a procedure that Ken Pugh refers to as "prefactoring".This functional, thought-provoking consultant info prefactoring directions in layout, code, and trying out, each one derived from the teachings of many builders through the years. by way of following those guidance, you are way more more likely to create extra readable and maintainable code than may rather be the case.

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Extra resources for Prefactoring: extreme abstraction; extreme separation; extreme readability

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The pair programming practice of Extreme Programming ensures that two people can read the code. If you are solo-programming, Nitin Narayan, a reviewer, suggests, "Readability of code is best verified when tested by two or three programmers who read the code and explain what it does to the actual coder. I call this the code readability test. 1. Implicitness Versus Explicitness Implicitness makes programs shorter, but can make them less readable by programmers who are less experienced in the language or who use many languages simultaneously.

WHAT'S AN ERROR TO YOU? Deviations and errors are one way of classifying failures. Gary K. Evans, a reviewer, likes the term deviation but has grown accustomed to using exceptions, where an error is a kind of exception, but not conversely. He categorizes identified exceptions as 0 = no exception (no error); 1 = recoverable ; 2 = unrecoverable; and 3 = fatal. He notes: Recoverable exceptions let you return to the main use case path and attain the goal of the use case. For nonrecoverable exceptions, you must abandon the goal.

However, you are also communicating with the reader, showing him the steps you are taking to complete an operation. The most important issues to communicate are what are you doing and why you are doing it, not how you are doing it. Code should communicate its purpose and your intention. On at least one level, code should read like a book, albeit one with stilted syntax. The client should be able to read the code to see if it follows the logic that he expressed in the requirements. The details of the implementation should be relegated to deeper levels.

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