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How do I push new data into an existing hash?

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Contributed by Anonymous Monk on May 22, 2000 at 22:56 UTC
Q&A  > hashes


Answer: How do I push new data into an existing hash?
contributed by KM

Simple answer:

$hash{key} = $val;

Better answer:

read perldata (perldoc perldata)

Answer: How do I push new data into an existing hash?
contributed by Juerd

To append to one of the values, treat it like any other scalar and use the .= operator: $hash{key} .= 'string'.

To merge two hashes into a third, use %third = (%first, %second).

To add a second hash to the first, use @first{keys %second} = values %second (You could use the merging technique, but that's very inefficient).

Answer: How do I push new data into an existing hash?
contributed by BeernuT

use the '.=' operator

my $val = " World"; my %hash = (key => "Hello"); $hash{key} .= $val; print "$hash{key}";
outputs
'Hello World'

-bn
Answer: How do I push new data into an existing hash?
contributed by bradcathey

And if it is a hash ref, use the arrow operator:

$hash -> {key} = $val;
Answer: How do I push new data into an existing hash?
contributed by merlyn

perldoc perldata

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