How do I get the first element upon certain condition in an Enumerator?

Question

I have:

a = [1,2,3,4,5,4,3,2,1]
a.select{|x| x > 3} #=> [4, 5, 4]

What I want is "4", the first element that applies to the condition only. I know I could do:

a.select{|x| x > 3}.first #=> 4

But is this my best option? The select method will go trough all elements. Is there a more efficient way to apply this?

Answer 1

Here it is using Enumerable#find :

a = [1,2,3,4,5,4,3,2,1]
a.find{|x| x > 3}
# => 4

Answer 2

使用find而不是select ：

a.find { |x| x > 3 } # => 4