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Re^2: Perlplexation - foreach shoulda Known

by eyepopslikeamosquito (Chancellor)
on Apr 13, 2012 at 21:51 UTC ( #965000=note: print w/replies, xml ) Need Help??

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  1. or download this
    x = [ 'apple', 'banana', 'orange' ]
    for i, val in enumerate(x): print i, val
    
  2. or download this
    0 apple
    1 banana
    2 orange
    
  3. or download this
    x = [ 'apple', 'banana', 'orange' ]
    x.each_with_index { |val, i| print "#{i} #{val}\n" }
    
  4. or download this
    use List::MoreUtils qw(each_array);
    my @x = ( 'apple', 'banana', 'orange' );
    ...
    while ( my ($i, $val) = $it->() ) {
        print "$i $val\n";
    }
    
  5. or download this
    my @x = ( 'apple', 'banana', 'orange' );
    while ( my ($i, $val) = each @x ) {
        print "$i $val\n";
    }
    

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[Eily]: you could tie a variable into not having the same value each time, if you like to make people who try to debug your code facepalm
[Corion]: perl -wle 'package o; use overload q("") => sub {warn "str"; ""}, bool => sub{warn "bool"; 1}; package main; my $o={}; bless $o => o; print "Yay" if ($o && !length($o))'
[Corion]: But people writing such code should document the objects they construct and why it makes sense for an object to be invisible as string while being true in a boolean context
[hippo]: That's equal parts clever and horrendous.
[Eily]: the overload version wouldn't return true with "$x" && !length $x though, I guess
[hippo]: The more I look at this code, the more $x is a plain old scalar and the more this condition will never be true. I'm calling it a bug at this point.
[hippo]: Thanks for your input which has soothed my sanity (a little)
[Corion]: Eily: Sure - if you force both things into stringy things, then you break that magic. But that would also mean that you changed the expression, as now $x = 0.00 will be true instead of false as it were before
[Corion]: Ah no, at least in my feeble experiments that doesn't change the meaning
[Corion]: We sell sanity in small packages ;)

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