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All the Perl that's Practical to Extract and Report

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  • It's the fact that return value of blocks is the last expression evaluated. And the body of a subroutine is a block.

    The fact that blocks return the last expression evaluated is what makes writing concise maps and greps.

    Also note that whether a subroutine returns something or not is not determined by a return, or a last expression. Like anything else, it's determined by context. A subroutine will return nothing, if, and only if, it's called in void context. Otherwise, it will return something, even if it

    • It's an OO API, so you subclass process_line to process a line of data. But I forgot that (somewhere in another file/class) that if process_line returns a scalar it gets sent to the client. It's hard to see that sort of thing in OO virtual APIs sometimes, but as everyone has rightly pointed out - it was programmer error.

      Doesn't mean I think "use strict 'return'" is any less of a good idea though.