Ruby array each_slice_with_index?

Question

If I have arr = [1, 2, 3, 4] I know I can do the following...

> arr.each_slice(2) { |a, b| puts \"#{a}, #{b}\" }
1, 2
3, 4

...A

Answer 1

arr.each_slice(2).with_index { |(*a), i| ...

also note that the array, first parameter of the block, can be *arr