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Re: Perl5 Language Extension: Definedness-Triggered Shortcut Operators

by martin (Pilgrim)
on Mar 18, 2012 at 11:57 UTC ( #960282=note: print w/ replies, xml ) Need Help??


in reply to RFC: Perl5 Language Extension: Definedness-Triggered Shortcut Operators

One syntactical alternative I could think of is:

A &&& B # defined-and A ||| B # defined-or A >>> B # safe arrow

This would be a systematic approach reminiscent of the role of undef in ternary logic -- triple sign, third kind of truth value involved.

I am not sure whether a whole lot of other similar symbols like ^^^ would make as much sense, though, which means we then had to explain why only those mentioned above were there.


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Re^2: Perl5 Language Extension: Definedness-Triggered Shortcut Operators
by JavaFan (Canon) on Mar 18, 2012 at 12:20 UTC
    A &&& B   # defined-and
    You're not the first. Here's the reason why it's a bad idea:
    $ perl -ce 'A &&& B' -e syntax OK
    It's not worth breaking backwards compatability for this.

      You are right, triple ampersand parses as "boolean and" followed by a "subroutine call sigil". Too bad.

        The odds of there being code in the wild that does $a&&&foo() with no space seem pretty slim to me. It even seems rather unlikely in an obfu. Not that I have personally witnessed p5p be swayed by such arguments before.

        The odds of "$a &&& $b" being non-broken code in the wild seems even slimmer.

        - tye        

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