ActiveSupport、String#to
まんま
>> require "rubygems" => true >> require "active_support" => true >> "hello".to(0) => "h" >> "hello".to(2) => "hel" >> "hello".to(10) => "hello"
まんま
>> require "rubygems" => true >> require "active_support" => true >> "hello".to(0) => "h" >> "hello".to(2) => "hel" >> "hello".to(10) => "hello"