TIL: Counting Consecutive Items in a Ruby Array

I wanted to know how many times a thing occurs consecutively in array. Only consecutive items are important.

So using Ruby's Enumerable#chunk method...

[1, 1, 2, 2, 3, 1, 1]
  .chunk { |x| x }
  .map { |x, xs| [x, xs.count] }
# => [[1, 2], [2, 2], [3, 1], [1, 2]]