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complain when developer attempts to use iteration variable outside of a loop #82

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atsepkov opened this issue Sep 12, 2015 · 0 comments
Open

complain when developer attempts to use iteration variable outside of a loop #82

atsepkov opened this issue Sep 12, 2015 · 0 comments
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@atsepkov
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The following anti-pattern is possible but should be discouraged:

for i in array:
    ...
doSomething(i)

Reasons for discouraging this pattern:

  1. for-in and native for will be off by 1 after loop terminates (this is implementation detail but a fix isn't worth it)
  2. this is illegal in all languages with proper scoping (i.e. perl) and will be illegal in JavaScript in the future (when let keyword is used for loop iterators)
  3. this pattern is discouraged even in languages where it's legal due to ambiguity
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@atsepkov