Beefy Boxes and Bandwidth Generously Provided by pair Networks
more useful options
 
PerlMonks  

How do I push new data into an existing hash?

( #14263=categorized question: print w/ replies, xml ) Need Help??
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

Please (register and) log in if you wish to add an answer



  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others cooling their heels in the Monastery: (6)
    As of 2015-07-04 16:50 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (60 votes), past polls