behavior of semicolon on return line

[perl@swanmail.com]

Does the semicolon behave any differently for a return test statement?

Example,

sub validate
{ return shift =~ /^[a-zA-Z0-9][\w-]*\.[a-zA-z]+$/ }

or

sub validate
{ return shift =~ /^[a-zA-Z0-9][\w-]*\.[a-zA-z]+$/; }

thanks


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[Tim Johnson]

I don't know, does it?

-----Original Message-----
From: [email]perl@swanmail.com[/email] [mailto:perl@swanmail.com]
Sent: Friday, October 10, 2003 7:02 PM
To: [email]beginners@perl.org[/email]
Subject: behavior of semicolon on return line


Does the semicolon behave any differently for a return test statement?

Example,

sub validate
{ return shift =~ /^[a-zA-Z0-9][\w-]*\.[a-zA-z]+$/ }

or

sub validate
{ return shift =~ /^[a-zA-Z0-9][\w-]*\.[a-zA-z]+$/; }

thanks


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[John W. Krahn]

[email]perl@swanmail.com[/email] wrote:

>
> Does the semicolon behave any differently for a return test statement?
>
> Example,
>
> sub validate
> { return shift =~ /^[a-zA-Z0-9][\w-]*\.[a-zA-z]+$/ }
>
> or
>
> sub validate
> { return shift =~ /^[a-zA-Z0-9][\w-]*\.[a-zA-z]+$/; }

Trailing commas and semicolons are optional.

( 1, 2, 3, 4 ) is the same as ( 1, 2, 3, 4, ) and { statement1;
statement1; statement1 } is the same as { statement1; statement1;
statement1; }



John
--
use Perl;
program
fulfillment

[Rob Dixon]

John W. Krahn wrote:

> [email]perl@swanmail.com[/email] wrote:

> >
> > Does the semicolon behave any differently for a return test statement?
> >
> > Example,
> >
> > sub validate
> > { return shift =~ /^[a-zA-Z0-9][\w-]*\.[a-zA-z]+$/ }
> >
> > or
> >
> > sub validate
> > { return shift =~ /^[a-zA-Z0-9][\w-]*\.[a-zA-z]+$/; }

>
>
> Trailing commas and semicolons are optional.
>
> ( 1, 2, 3, 4 ) is the same as ( 1, 2, 3, 4, ) and { statement1;
> statement1; statement1 } is the same as { statement1; statement1;
> statement1; }

Yes. A the semicolon is a statement separator in Perl. Unlike C,
where it is a statement terminator and the final semicolon is
required. Null statements are also allowed, so

( return 99; }

is the same as

{ return 99 }

or

{ return 99; ; ; ; ; ; ; }

HTH,

Rob

[Jenda Krynicky]

From: "Rob Dixon" <rob@dixon.port995.com>

> Yes. A the semicolon is a statement separator in Perl. Unlike C,
> where it is a statement terminator and the final semicolon is
> required. Null statements are also allowed, so
>
> ( return 99; }
>
> is the same as
>
> { return 99 }
>
> or
>
> { return 99; ; ; ; ; ; ; }

As you can see if you ask Perl to show you how did it parse the code:

perl -MO=Deparse -e "sub foo {return 99}"
perl -MO=Deparse -e "sub foo {return 99;}"
perl -MO=Deparse -e "sub foo {return 99;;;;;;;}"


See
perldoc B::Deparse

Jenda
===== [email]Jenda@Krynicky.cz[/email] === [url]http://Jenda.Krynicky.cz[/url] =====
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