Re: [FWP] hasheesh

[Ronald J Kimball <rjk@linguist.thayer.dartmouth.edu>]

On Thu, Mar 29, 2001 at 12:03:10PM -0500, Jeff Pinyan wrote:
> On Mar 29, Casey West said:
> 
> >I use something like this:
> >
> >map {
> >     # processing here
> >     print "$_->[0] => $_->[1]\n"
> >    } map { [ each %ENV ] } keys %ENV;
> 
> Ouch.  You just created a list of the keys in %ENV for no good
> reason.  Why not do:
> 
>   map { ... } map { [ $_ => $ENV{$_} ] } keys %ENV;
> 
> if you're going to use keys %ENV.  Or, use it in the scalar context:
> 
>   map { ... } map { [ each %ENV ] } 1 .. keys %ENV;
> 
> But map() in void context is evil. ;)
> 

Two maps in a row is unnecessary.

map { local $_ = [ $_ => ENV{$_} ]; ... } keys %ENV;

Ronald

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