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Re^4: wantarray alternative

by tqisjim (Beadle)
on Jul 10, 2013 at 20:22 UTC ( #1043553=note: print w/ replies, xml ) Need Help??


in reply to Re^3: wantarray alternative
in thread wantarray alternative

I'm having trouble following the thread on CB.

sub lowercase { return map { lc } @_ ; } $jim = lowercase( 'Jim' ) ; ## $jim == 1
Not the first, not the last, just the count, right?


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Re^5: wantarray alternative
by LanX (Abbot) on Jul 10, 2013 at 20:24 UTC
    before I answer this, please clarify which is the result expected for

      $name = lowercase( 'Jim',"Jeff" ) ;

    ???

    Cheers Rolf

    ( addicted to the Perl Programming Language)

      OK, since the day is shot anyway...

      What do experienced programmers expect? It seems like there was a lot of confusion on CB about the first or last element (both wrong).

      I expect the answer is 2, which I've confirmed by testing. But obviously, I've seen the source code.

      If I were looking at that statement without seeing the source code, I would have to test or read the source code to expect anything at all. Since the statement is called lowercase (I might've used convert_to_lowercase), one is unlikely to use this function to count the number of input arguments. So intuitively, the statement should not return 2. In summary, the point of my effort.

      The solution I'd prefer to implement would return Jim. But the most robust answer would probably be to throw an exception.

        > The solution I'd prefer to implement would return Jim.

        so first code-example in Re: wantarray alternative (Context propagation)

        > But the most robust answer would probably be to throw an exception.

        so check wantarray to do so

        Cheers Rolf

        ( addicted to the Perl Programming Language)

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