Re: Grep and AoH references

Grep wants an array for its second argument. Dereference your AoHref:

my $newAoH = [grep { !($_->{'name'} eq "fred") } @$AoHref];
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Update: I was too hasty and only fixed the dereference problem. Obviously, to create a new AoH, you have to actually create the reference. So I've put the brackets on the expression.

Caution: Contents may have been coded under pressure.

Comment on Re: Grep and AoH references Download Code

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Re^2: Grep and AoH references by de-merphq (Beadle) on Dec 30, 2004 at 16:49 UTC
Actually grep want a list following its first argument. The reason the code doesnt throw a wobbly is that a reference to an array is a list of one element (the reference). By dereferencing $AoHref you get a different list, that being the contents of the array. A subtle but important distinction (that lots of folks around here love to harp on about, like me :-) Also the code as posted is wrong. Grep returns a list, so if you assign to a scalar like you are you get the count of objects that passed the filter test, not the list of objects. The code should look like `my @grepped=grep ...` --- alter ego of demerphq	[reply] [d/l]
Re^2: Grep and AoH references by bradcathey (Prior) on Dec 30, 2004 at 16:50 UTC
I tried that but Data::Dumper returned "2". —Brad "Don't ever take a fence down until you know the reason it was put up." G. K. Chesterton	[reply]