Is it possible to catch index out of range ? a = [1,2] a[99] returns nil, I would like to get an error. I've tried to define a SafeArray class, but failed. I managed to redefine Array, but I want to have both possibilities. class Array alias old [] def [](index) raise "index error" if index.abs >= self.size self.old(index) end end Is there something like Array.indexcheck = true ? Christer -- Posted via http://www.ruby-forum.com/.