Given an array of unsorted positive ints, write a function that finds runs of 3 consecutive numbers (ascending or descending) and returns the indices where such runs begin. If no such runs are found, return an empty array.

findConsecutiveRuns

# jotted this quick

def consecutive(array)
  index_collection = []
  array.each_with_index do |integer, index|
    if consecutive_forwards(array, integer, index) || consecutive_backwards(array, integer, index)
      index_collection.push(index)
    end
  end
  index_collection
end

def consecutive_backwards(array, integer, index)
  (array[ index + 1 ] == integer - 1 ) && (array[ index + 2 ] == integer - 2)
end

def consecutive_forwards(array, integer, index)
  (array[ index + 1 ] == integer + 1 ) && (array[ index + 2 ] == integer + 2)
end

consecutive([1, 2, 3, 5, 10, 9, 8, 9, 10, 11, 7])