#!/usr/local/bin/perl6

#Modify array in loop array is in fact a ref, okay it works!
sub a(@r) {
    loop (my $i=0; $i < @r.elems ; $i++){
        @r[$i] = '[' ~ @r[$i] ~ ']';
    }
}

#Ok it works too : but is it safe tu use $_???
sub b(@r) {
    for @r  {
        $n = '[' ~ $_ ~ ']';
    }
}

#fuck it sucks! :(
sub c(@r) {
    for @r -> $e {
        $e = '[' ~ $e ~ ']';
    }
}

my @d = 'a','b','c','d','e' ;

f @d ;
g @d;

say @d;