Check if a value exists in an array in Ruby Technology Community › Category: Ruby › Check if a value exists in an array in Ruby 0 Vote Up Vote Down VietMX Staff asked 4 years ago Problem I have a value Dog and an array ['Cat', 'Dog', 'Bird']. How do I check if it exists in the array without looping through it? Is there a simple way of checking if the value exists, nothing more? You’re looking for include?: >> ['Cat', 'Dog', 'Bird'].include? 'Dog' => true