Larry Wall Quotes on Best practices
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It won't be covered in the book. The source code has to be useful for something, after all... :-)
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That being said, I think we should immediately deprecate any string concatenation that combines '19' with '99'. :-)
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break; /* don't do magic till later */
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#else /* !STDSTDIO */ /* The big, slow, and stupid way */
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Be consistent.
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Perl is designed to give you several ways to do anything, so consider picking the most readable one.