Как найти значение в массиве ruby

a = [1,2,3,4,5]
a.include?(3)   # true
a.include?(9)   # false

(1..10).detect   { |i| i % 5 == 0 and i % 7 == 0 }   #=> nil
(1..10).find     { |i| i % 5 == 0 and i % 7 == 0 }   #=> nil
(1..100).detect  { |i| i % 5 == 0 and i % 7 == 0 }   #=> 35
(1..100).find    { |i| i % 5 == 0 and i % 7 == 0 }   #=> 35

array = [1,2,3]
found = array.select {|e| e == 3} # [3]

found = array.select {|e| e == 3}.first # 3