Beefy Boxes and Bandwidth Generously Provided by pair Networks
Pathologically Eclectic Rubbish Lister
 
PerlMonks  

Re: map problem

by moritz (Cardinal)
on Mar 09, 2012 at 10:57 UTC ( #958676=note: print w/ replies, xml ) Need Help??


in reply to map problem

This is another instance of the problem that a pair of curlies can stand for an anonymous subroutine or a hash reference. You can disambiguate with a semicolon in the block:

my %y = map {; "prefix_$_" => 1 } qw(a b c);

It's more of a design limitation than a bug in perl or in you :-)


Comment on Re: map problem
Download Code
Replies are listed 'Best First'.
Re^2: map problem
by morgon (Deacon) on Mar 09, 2012 at 11:01 UTC
    Ok, but why is it neccessary only in the second case?

      The decision to parse an opening curly bracket as a block or a hash ref is really just a heuristic. When the parser sees a string quote, it decides in favor of the hash ref, whereas a variable makes it assume a block.

      Or put differently, the parser cheats as hell, and sometimes that backfires. But not always.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://958676]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others imbibing at the Monastery: (8)
As of 2015-07-08 02:06 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (93 votes), past polls