Factor out long expressions in the middle of statements .
The previous guideline applies only if the long expression to be broken is the last value in a statement. If the expression appears in the middle of a statement, it is better to factor that expression out into a separate variable assignment. For example:
my $next_step = $steps[-1] + $radial_velocity * $elapsed_time + $orbital_velocity * ($phase + $phase_shift) - $DRAG_COEFF * $altitude ; add_step( \@steps, $next_step, $elapsed_time);
rather than:
add_step( \@steps, $steps[-1] + $radial_velocity * $elapsed_time + $orbital_velocity * ($phase + $phase_shift) - $DRAG_COEFF * $altitude , $elapsed_time);