Ruby Detect method

Question

Select makes sense. But can someone explain .detect to me? I don\'t understand these data.

>> [1,2,3,4,5,6,7].detect { |x| x.between?(3,4) }
=> 3
>&g         


        

Answer 1

detect just returns the first value that satisfies the predicate, if any, nil otherwise. select returns all the values that satisfy the predicate. a.detect { p } is analogous to a.select { p }[0]

 irb(main):001:0> [1,2,3].detect { true }
 => 1
 irb(main):002:0> [1,2,3].detect { false }
 => nil
 irb(main):003:0> [1,2,3].detect { |x| x % 2 == 0 }
 => 2