On 5/5/05, Terrence Brannon <[EMAIL PROTECTED]> wrote:
> I was looking at a line in the hangman program:
>   @letters == @solution.grep:{ $_ ne '' };
> and was told that I was looking at an adverbial block.
> But I don't understand what that is and could not find a description
> and examples in a reverse search on dev and nntp.perl.org.

Methods with arguments require parens. However, the block to grep
isn't I<really> an argument. It's describing the manner in which the
array will be grepped... that's an adverb to grep.

So, why are the parens required on methods? Take the following if statements:

if @foo.shift { ... }

if @foo.grep { ... }   # grep doesn't get the block

To make things clear, methods without parens are assumed to take no
arguments. In order to pass a block to the above grep, you either need
to use @foo.grep({ $^a <=> $^b}) or the adverbial colon:

if @foo.grep:{$^a <=> $^b} { ... }

Ashley Winters

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