Not an answer to your splice question, but this seems a good deal more straightforward... if it fits your "realworld application." 
#!/usr/bin/perl
use Modern::Perl;

# 937262

my @chars = qw( a b c ? : ! f g );
my @newchars = ();

for my $char(@chars) {
    if ($char =~ /[[:alpha:]]/ ) {       # posix: letters. cf alts for
+ unicode "Properties" usage
        push @newchars, uc($char);
    }else{
        push @newchars, $char;
    }
}

for my $newchar(@newchars) {
    print $newchar . " ";     # A B C ? : ! F G 
}

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In reply to Re: Array slice vs foreach and push by ww
in thread Array slice vs foreach and push by chrisburel

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