Find value in an array

Question

In Ruby, how can I find a value in an array?

Answer 1

If you want find one value from array, use Array#find:

arr = [1,2,6,4,9] 
arr.find {|e| e%3 == 0}   #=>  6

See also:

arr.select {|e| e%3 == 0} #=> [ 6, 9 ]
e.include? 6              #=> true

To find if a value exists in an Array you can also use #in? when using ActiveSupport. #in? works for any object that responds to #include?:

arr = [1, 6]
6.in? arr                 #=> true