http://www.perlmonks.org?node_id=1004433

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

Hello monks,

I have hash reference that holds some values. I would like to add new values to it from another hash reference. What's the best way to do it?

I'm using Perl 5 version 12.

Replies are listed 'Best First'.
Re: Append to hash reference
by tobyink (Canon) on Nov 18, 2012 at 16:20 UTC 
    use Data::Dumper;

my $ref1 = { foo => 1, bar  => 2 };
my $ref2 = { baz => 3, quux => 4 };

# Assign to the ref1 hash the data in both hashes
%$ref1 = (%$ref1, %$ref2);

print Dumper $ref1;

    [download]

    Or...

    use Data::Dumper;

my $ref1 = { foo => 1, bar  => 2 };
my $ref2 = { baz => 3, quux => 4 };

# Loop through the keys of the second hash, assigning values into the 
+first
$ref1->{$_} = $ref2->{$_} for keys %$ref2;

print Dumper $ref1;

    [download]
    perl -E'sub Monkey::do{say$_,for@_,do{($monkey=[caller(0)]->[3])=~s{::}{ }and$monkey}}"Monkey say"->Monkey::do'
[reply]
[d/l]
[select]

      Or...

      use Data::Dumper;

my $ref1 = { foo => 1, bar  => 2 };
my $ref2 = { baz => 3, quux => 4 };

# Use a hash slice to override values from the first hash with the sec
+ond hash
@$ref1{ keys %$ref2 } = values %$ref2;

      [download]
[reply]
[d/l]
Re: Append to hash reference
by Anonymous Monk on Nov 19, 2012 at 11:09 UTC

    Thanks everyone :)<?p>

[reply]

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