I have read this question in the FAQ, and also looked through perldata.

I often use this for named parameters: 

sub abc {
  my %param = @_;
  for my $required qw( banana nut ) {
    die "missing: $required" unless defined $param{$required};
  }
  # etc
}

[download]
Now, what I would like to do is something like: 
sub abc {
  # set up defaults
  my %param = (
      apples => 'green',
      banana => 'yellow',
    );
  # now override with any passed params
  %param = @_;
  for my $required qw( banana nut ) {
    die "missing: $required" unless defined $param{$required};
  }
  # etc
}

[download]

but the @_ assignment to %param trashes any existing values. I already know I can 

  my %passed = @_;
  (@param{ keys %passed }) = values %passed;

[download]

but is there a way to do it without an intermediate hash? i.e. straignt from @_? I want something like push that works on a hash?

Hope this makes sense! Thanks in advance,

Jeff

In reply to How do I push values onto an existing hash? by jaa

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • 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, details, 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, summary, 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.