In Ruby, what is the cleanest way of obtaining the index of the largest value in an array?

Question

If a is the array, I want a.index(a.max), but something more Ruby-like. It should be obvious, but I\'m having trouble finding the answer at so and

Answer 1

a = [1, 4 8]
a.inject(a[0]) {|max, item| item > max ? item : max }

At least it's Ruby-like :)