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

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 (Saint) 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', );` [download] Cheers Rolf _{(addicted to the Perl Programming Language :) Wikisyntax for the Monastery FootballPerl is like chess, only without the dice}	[reply] [d/l]

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Re^3: New Discovery!!! (sub call without parentheses)
by LanX (Saint) 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',
);
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Cheers Rolf
_{(addicted to the Perl Programming Language :)

Wikisyntax for the Monastery
FootballPerl is like chess, only without the dice}

[reply]
[d/l]

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