From: Love U Ruby Date: 2013-02-17T05:46:39+09:00 Subject: Re: How the string concatenation operator hackes(modifies) the string contents of frozen array? humm, You are correct. That's why array#replace allowed on the frozen array, but none of the array#pop,array#push,array#rotate! etc not allowed. Thanks -- Posted via http://www.ruby-forum.com/.