Question

I’m searching the way(s) to fill an array with numbers from 0 to a random. For example, from 0 to 12 or 1999, etc.

Of course, there is a for-loop:

var arr = int[n];
for(int i = 0; i < n; i++)
{
  arr[i] = i;
}

And I can make this method been an extension for Array class. But is there some more interesting ways?

Answer 1

This already exists(returns IEnumerable, but that is easy enough to change if you need):

arr = Enumerable.Range(0, n);