How to find the index of an array which has a maximum value

Question

I have an array of elements. If I do a arr.max I will get the maximum value. But I would like to get the index of the array. How to find it in Ruby

For example

a = [3,6,774,24,56,2,64,56,34] => [3, 6, 774, 24, 56, 2, 64, 56, 34] >> a.max a.max => 774 

I need to know the index of that 774 which is 2. How do I do this in Ruby?

Answer 1

a.index(a.max)  should give you want you want