[Purdue-pm] Can do better with map somehow?
Dave jacoby
jacoby at purdue.edu
Wed Nov 24 10:57:02 PST 2010
So, I have a function that dumps a DB into a hashref. Assume the dump
looks like a long version of this.
$VAR1 = {
'a' => {
'foo' => 1 ,
'bar' => 'Cheers' ,
} ,
'b' => {
'foo' => 3 ,
'bar' => 'Crow' ,
} ,
'c' => {
'foo' => 1 ,
'bar' => 'Neon Cactus' ,
} ,
...
}
I would love to have that same hashref, except only containing only
parts where 'foo' == 1. I can certainly loop it, but I'm learning more
and more about map and it's finding its way into much more of my code.
my $second ; %$second = map { $_ => $first->{$_} } keys %$first ; gets
me a full copy, but I can't imagine a way to get grep to work for me and
sort can just organize 'em. Is there a cool thing I'm missing?
--
Dave Jacoby Address: WSLR S049
Code Maker Mail: jacoby at purdue.edu
Purdue University Phone: 765.49.67368
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