If statements inside or outside loops?

Question

Is it better if I do this:

foreach my $item ( @array ) {
   if ( $bool ) {
     .. code ..
   }
   else {
     .. code ..
   }
}

or

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Answer 1

The second will be faster since many fewer comparisons. -- The compare is outside the loop rather than inside.

And since the comparison variable is a loop invariant, I'd be surprised if it wasn't also clearer coding.

Actual speed difference (wall clock time) depends on size of the array