Re: explanation of constant syntax?

I understand that the bareword FOO inside the parens is similar to when it's inside @{[...]} because it causes the subroutine created by the constant pragma to be called rather than FOO to simply be used as a hash key.

Would you elucidate on why this happens or point me to the right perldoc to read on this subject?

---
"A Jedi uses the Force for knowledge and defense, never for attack."

Comment on Re: explanation of constant syntax?

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•Re: Re: explanation of constant syntax? by merlyn (Sage) on Mar 20, 2004 at 18:22 UTC
Well, just break it apart: `[ ... ]` [download] creates an arrayref pointing to its contents, in this case FOO (not quoted, so we get the constant value). And then: `@{ ... }` [download] dereferences the enclosed value as if it were an array reference. So essentially, this is the hard way to say: `( ... )` [download] between the two of them, except that it also interpolates within a double-quoted string. That's how I stumbled across this in the first place: how to evaluate a value inside a double-quoted string. I wrote about it in a CLP posting early in the Perl5 days, and the meme stuck and is still being used in other places. -- Randal L. Schwartz, Perl hacker Be sure to read my standard disclaimer if this is a reply.	[reply] [d/l] [select]

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•Re: Re: explanation of constant syntax?
by merlyn (Sage) on Mar 20, 2004 at 18:22 UTC

[ ... ]
[download]

@{ ... }
[download]

( ... )
[download]

-- Randal L. Schwartz, Perl hacker
Be sure to read my standard disclaimer if this is a reply.

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