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The question was "What is the difference between for and foreach?" not "What is the difference between the keywords for and foreach?" - it could also mean "What are the differences between the for and foreach loops?" (of which there are several notable differences which perl does not treat the same)
It's an ambiguous question that should be followed by another question to determine whether it is about the keywords or the loops.
This post has too many branches :)
"But what of all those sweet words you spoke in private?"
"Oh that's just what we call pillow talk, baby, that's all."
In reply to Re^4: Interview Prepration