Toady Tim. Is map() a function, technically?
#! /usr/bin/perl -lw
my @a = split //, shift;
print "INPUT = <@a>";
# @a[0..$#a] = @a[map -1-$_, 0..$#a];
@a[$_,~$_] = @a[~$_,$_] for 0..$#a/2;
print "OUTPUT = <@a>";
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