as a c++ programmer, I don't have the use of a foreach loop, but I desperately need to simulate one. my question is, where during the foreach loop is the length of the list evaluated?

for example: 

sub get_all_seqs{
    my $protein = shift;
    #print "protein = $protein\n";
    my @all_seqs;
    my %Deg_codons = get_degenerate();    
    my %SEQ = ();
    my @aas = split(//, $protein);
    my $aa = $aas[0];

    my @codons = @{$Deg_codons{$aa}};
    foreach my $codon(@codons){
        $SEQ{$codon}=1;
    }

    for(my $i=1; $i<@aas; $i++){
        my $aa = $aas[$i];
        @codons = @{$Deg_codons{$aa}};
        foreach my $seq(keys %SEQ){
            foreach my $codon(@codons){
                $SEQ{$seq.$codon}=1;
            }
            delete $SEQ{$seq};
        }    
    }

    @all_seqs = sort keys %SEQ;    
    
    return @all_seqs;
}

[download]


The first foreach loop inside the for loop.

where is the length of "keys %SEQ" evaluated?

In reply to foreach to for by tricolaire

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.