Both tilly and indigo have exactly the same result, which is a fix of twerq's including 1) my, and 2) the test for $t which prevents infinite looping.

Here is a solution which is short, but not 'strict' compliant: sub f{for(($s,$t)=@_;$_=$$t{(0,l,r)[$$t{d}cmp$s]};$t=$_){}$t} Alas, although 4 characters lighter, it doesn't return 0 on misses properly. This does, but is admittedly 3 characters heavy: sub f{for(($s,$t)=@_;$_=$t&&(0,l,r)[$$t{d}cmp$s];){$t=$$t{$_}||0}$t} Or, a tie, provided the tree has 0-value stubs as it does in other examples: sub f{for(($s,$t)=@_;$_=$t&&(0,l,r)[$$t{d}cmp$s];){$t=$$t{$_}}$t} Fun test code below for a tree: 
    $|++;
    $table = {
        d => 'h',
        l => {
             d => 'd',
             l => { d => 'b', l => { d => 'a' }, r => { d => 'c' } },
             r => { d => 'f', l => { d => 'e' }, r => { d => 'g' } },
        },
        r => {
             d => 'l',
             l => { d => 'j', l => { d => 'i' }, r => { d => 'k' } },
             r => { d => 'm', l => { d => 'l' }, r => { d => 'n' } },
        }
    };

    foreach $y (qw[ a b c d e f g h i j k l m n o p q ])
    {
            $x = f($y,$table);
            print "Answer for $y = ";
            print $x," ", $$x{d},"\n";
    }

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value entry in the hash.

In reply to Re^4: Golf: Tree searching by tadman
in thread Golf: Tree searching by Masem

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