Create new arrays after modify the class irb(main):138:0> class Array irb(main):139:1> irb(main):140:1* def second irb(main):141:2> self.at(1) irb(main):142:2> end irb(main):143:1> irb(main):144:1* end => :second irb(main):145:0> %w[1 2 3].second => "2" already created Arrays should have not your custom methods Thread name: "why is the method not found." Mail number: 1 Date: Fri, Dec 05, 2014 In reply to: Roelof Wobben > > Hello, > > I try to solve this challenge : > > Define a new instance method on the Array class called second, which returns > the second item in an array (similar to the way .first and .last work in Ruby). > > So I did this : > > class Array > > def second > self.at(1) > end > > end > > With this test : > > Test.assert_equals(4, Array.second([3,4,5]) ) > > but as soon as I try the test I see this error: > > ': undefined method `second' for Array:Class (NoMethodError) > > Which I find wierd because I made that method. > > Roelof > >