Not the shortest, but this was what was obvious to me... 

sub c {
  #_123456789_123456789_123456789_123456789_12345
   $i=pop;for(@_){$c=$_ if abs$i-$c>abs$i-$_}$c
}

[download]
Chris

In reply to Re: Closest-value-in-list Golf! by mr_mischief
in thread Closest-value-in-list Golf! by larryk

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