CODE EXAMPLE FOR RUBY

ruby array includes

# Ruby
['Cat', 'Dog', 'Bird'].include? 'Dog'
# => true

# Rails ActiveSupport
'Unicorn'.in?(['Cat', 'Dog', 'Bird'])
# => false

# Via case statement
element = 3
array = [1, 2, 3, 4, 5]
case element
when *array 
  puts 'found in array'
else
  puts 'not found in array'
end