in reply to A better (ie.more concise) way to write this?

Not as succinct as some of the other answers but possibly of interest.

$ perl -Mstrict -Mwarnings -E ' my @a = ( 1 .. 10 ); sub transform (&@); @a = transform { ( ++ $_ ) % 10 } @a; say qq{@a}; sub transform (&@) { map $_[ 0 ]->( $_ ), @_[ 1 .. $#_ ] }' 2 3 4 5 6 7 8 9 0 1 $

Update: Much more concise if you make the transform subroutine operate on $_ by default.

$ perl -Mstrict -Mwarnings -E ' my @a = ( 1 .. 10 ); sub transform (&); transform { ( ++ $_ ) % 10 } for @a; say qq{@a}; sub transform (&) { $_[ 0 ]->( $_ ) }' 2 3 4 5 6 7 8 9 10 11 $

Update 2: Just noticed that isn't working properly so will have to investigate why :-(

Update 3: Got it!

$ perl -Mstrict -Mwarnings -E ' my @a = ( 1 .. 10 ); sub transform (&); transform { $_ = ( ++ $_ ) % 10 } for @a; say qq{@a}; sub transform (&) { $_[ 0 ]->( $_ ) }' 2 3 4 5 6 7 8 9 0 1 $

Cheers,

JohnGG