From: "David A. Black" Date: 2007-11-15T19:51:58+09:00 Subject: Re: Array checking ???????????????????? Hi -- On Thu, 15 Nov 2007, Axel Etzold wrote: > > -------- Original-Nachricht -------- >> Datum: Thu, 15 Nov 2007 18:59:07 +0900 >> Von: Nadeesha Meththananda >> An: ruby-talk@ruby-lang.org >> Betreff: Array checking ???????????????????? > >> >> >> hi >> >> i have written a array like this. >> >> my_array = ["one","two","three","four"] >> >> no i want to check a given string is can be found from the above array. >> >> eg: >> >> if ( my_array.map{"one"} ) >> return true; >> else >> return false; >> end >> >> >> so here if i use "five" insted of "one" it should return false( as i >> think) but it does no happen. >> >> (simply want to check a given string is in the array or not) >> >> so if any body can help???? >> -- >> Posted via http://www.ruby-forum.com/. > > Dear Nadeesha, > > you can use > > class Array > def contains_entry?(entry) > if self-[entry]==self > return false > else > return true > end > end > end > > a=["one","two",3,4] > p a.contains_entry?("three") > > The idea is to see whether the array stays the same when you take > away something from it - if yes, that something wasn't in the array > in the first place. No, you definitely don't want to do that, for many reasons. As Jari said, just use include? if array.include?(entry) David -- Upcoming training by David A. Black/Ruby Power and Light, LLC: * Advancing With Rails, Berlin, Germany, November 19-22 * Intro to Rails, London, UK, December 3-6 (by Skills Matter) See http://www.rubypal.com for details!