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Re^2: New Discovery!!! (sub call without parentheses)

by stevieb (Canon)
on Dec 08, 2018 at 23:00 UTC ( #1226986=note: print w/replies, xml ) Need Help??


in reply to Re: New Discovery!!! (sub call without parentheses) - Coding Style
in thread New Discovery!!! (sub call without parentheses)

Two very good points there.

I always use parens on my user-defined functions whether I've got parameters or not. Kind of a habit actually now that I'm fluent in more than just a couple of languages, most of which enforce using parens. In fact, thinking about it, I think Perl's the only language which *doesn't* enforce parens if a function is pre-declared. Also, at a glance (at least with my own code), it's easier to identify built-ins, as I typically don't use parens for them (eg: sleep 10;).

The only time I'll leave parens off of a call, is if it's a method call where I'm not sending in any params:

my $object = My::Thing->new(speak => 'hi'); ... $object->speak;

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Re^3: New Discovery!!! (sub call without parentheses)
by LanX (Sage) on Dec 09, 2018 at 00:28 UTC
    > I think Perl's the only language which doesn't enforce parens if a function is pre-declared

    Ruby never does, but probably you wanted to say "if and only if" ?

    The possibility to omit parenthesis is essential for many syntactic sugar and DSL approaches.

    Compare "has" in Moose which looks like a keyword.

    update

    example

    has 'first_name' => ( is => 'rw', isa => 'Str', );

    Cheers Rolf
    (addicted to the Perl Programming Language :)
    Wikisyntax for the Monastery FootballPerl is like chess, only without the dice

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