Or with a XOR toggle: 

my $t = 0;
for( a..z ){ $t ^= 1; push @ary, $t ? $_ : uc $_ }
print @ary

[download]

cheers

tachyon

s&&rsenoyhcatreve&&&s&n.+t&"$'$`$\"$\&"&ee&&y&srve&&d&&print

In reply to Re: uc() every other letter by tachyon
in thread uc() every other letter by Anonymous Monk

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