$arr[$i] = [reverse @{$arr[$i]}];
assigns a new reference (by creating a new anonymous array) to $arr[$i] replacing the reference copied from @_. Without that reference you can't change the contents of @_
Whereas @{$arr[$i]} = reverse @{$arr[$i]} uses the reference copied from @_ to change the existing array elements.
# $#_[$i] doesn't work
sub print2DArray {
for my $i (0 .. $#_) {
for my $j (0 .. $#{$_[$i]}){
print $_[$i][$j]," ";
}
print "\n";
}
}
or
sub print2DArray7 {
for (@_) {
print join " ",@$_;
print "\n";
}
}
poj
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