Perl Best Practices [Electronic resources] نسخه متنی

2.17. Non-Terminal Expressions

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);