ActiveSupport、String#last
まんま
>> require "rubygems" => true >> require "active_support" => true >> "hello".last => "o" >> "hello".last(2) => "lo" >> "hello".last(10) => "hello"
まんま
>> require "rubygems" => true >> require "active_support" => true >> "hello".last => "o" >> "hello".last(2) => "lo" >> "hello".last(10) => "hello"