how to delete key from hash of array reference in perl

Question

I would like to delete a key from a hash of array reference:

if the "key" which I want to delete is 'Test', I tried something like

$Test = 'Test';

foreach my $k (keys %{$line}) {
     @{$line->{$k}} = grep @{$line->{'$Test'}} != 0, @{$line->{$k}};
}

But I could not remove it! Could someone tell me how to remove it?

It's not obvious how $line lokks like and what your plan exactly is. You should write a complete example, preferably with sample output. — U. Windl
– U. Windl, Commented Aug 1, 2023 at 7:57

Community · Accepted Answer · 2020-06-20 09:12:55Z

2

The perl delete operation does this. See the perlfunc manual:

delete EXPR

Given an expression that specifies a hash element, array element, hash slice, or array slice, deletes the specified element(s) from the hash or array. In the case of an array, if the array elements happen to be at the end, the size of the array will shrink to the highest element that tests true for exists() (or 0 if no such element exists).

It is discussed here:

edited Jun 20, 2020 at 9:12

CommunityBot

11 silver badge

answered Apr 3, 2015 at 23:51

Thomas Dickey

55.4k8 gold badges78 silver badges108 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

EpiMan Over a year ago

I tried: for my $k (keys %{$line}) { if ($k =~ m/$Test/){delete @{$line->{$Test}};}else{next;}} But did not work. I got delete argument is not a HASH or ARRAY element or slice at ...

Thomas Dickey Over a year ago

The delete would be applied to something like ${$line}{$k}, since that is the hash name/value I understood you were deleting. The @ indicates an array variable, while %{$line} is a hash variable.

Collectives™ on Stack Overflow

how to delete key from hash of array reference in perl

1 Answer 1

2 Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related