A note on efficiency:
`map EXPR, LIST' is in general quite a bit
faster than `map BLOCK LIST', so you should
probably try to use EXPRs rather than BLOCKs whenever
possible in a map.
For instance, here are your first examples recoded as
my @adjusted_array = map $_ * 10, @array;
my %hash = map split /-/, @array;
Why is it faster? Using the BLOCK introduces a new scope,
which adds some extra ops and time to start and finish.
BLOCKs do give you extra power and flexibility, but try to
use them only when necessary.
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