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Created November 3, 2011 14:25
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Checks for specific classes in Ruby and Java projects
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investigations.markdown

My contention is that Ruby developers are more likely to use Object#is_a?, Object#respond_to?, and Class#=== in their code than Java developers are to use "instanceof". Here is some anecdotal evidence supporting this contention. It's not easy to compare the two for a number of different reasons:

  1. Java projects tend to have a lot more code
  2. It's hard to decide which projects are comparable to others
  3. It's hard to search for uses of Class#===, which is most often used in case statements.

Nonetheless, here are some numbers which probably mean nothing.

Hibernate

  • SLOC: 385182
  • Lines containing 'instanceof': 1400
  • Proportionally: 0.39%

Rails

  • SLOC: 138628
  • Lines containing 'is_a?/respond_to?': 936
  • Proportionally: 0.68%
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