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 elsewhere. Obviously, I am new to Ruby.

Accepted Answer

For Ruby 1.8.7 or above:

```
a.each_with_index.max[1]
```

It does one iteration. Not entirely the most semantic thing ever, but if you find yourself doing this a lot, I would wrap it in an `index_of_max` method anyway.

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

Solution

Problem