Perl Best Practices [Electronic resources] نسخه متنی

5.11. Slice Layout

Use a tabular layout for slices .

A slice-to-slice assignment like:

@frames[-1,-2,-3]
= @active{'top', 'prev', 'backup'}; 

can also be written as:

@frames[ -1,    -2,     -3     ]
= @active{'top', 'prev', 'backup'}; 

This second version makes it immediately apparent which hash entry is being assigned to which array element. Unfortunately, this approach is useful only when the number of keys/indices in the slices is small. As soon as either list exceeds a single line, the readability of the resulting code is made much worse by vertical alignments:

@frames[ -1,    -2,     -3,      -4,          -5,      -6,
-7,          -8     ]
= @active{'top', 'prev', 'backup', 'emergency', 'spare', 'rainy day',
'alternate', 'default'};