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Code Complete, Second Edition
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   Contents Chapter 16 Checklist: Loops

Chapter 16: Controlling Loops

Loop Selection and Creation

  • Is a while loop used instead of a for loop, if appropriate?
  • Was the loop created from the inside out?

Entering the Loop

  • Is the loop entered from the top?
  • Is initialization code directly before the loop?
  • If the loop is an infinite loop or an event loop, is it constructed cleanly rather than using a kludge such as for i = 1 to 9999?
  • If the loop is a C++, C, or Java for loop, is the loop header reserved for loop-control code?

Inside the Loop

  • Does the loop use { and } or their equivalent to prevent problems arising from improper modifications?
  • Does the loop body have something in it? Is it nonempty?
  • Are housekeeping chores grouped, at either the beginning or the end of the loop?
  • Does the loop perform one and only one function-as a well-defined routine does?
  • Is the loop short enough to view all at once?
  • Is the loop nested to three levels or less?
  • Have long loop contents been moved into their own routine?
  • If the loop is long, is it especially clear?

Loop Indexes

  • If the loop is a for loop, does the code inside it avoid monkeying with the loop index?
  • Is a variable used to save important loop-index values rather than using the loop index outside the loop?
  • Is the loop index an ordinal type or an enumerated type-not floating point?
  • Does the loop index have a meaningful name?
  • Does the loop avoid index cross talk?

Exiting the Loop

  • Does the loop end under all possible conditions?
  • Does the loop use safety counters-if you've instituted a safety-counter standard?
  • Is the loop's termination condition obvious?
  • If break or continue are used, are they correct?


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