atzkey

# An idiomatic Ruby mixin to Array-like classes.
module ArrayX
  # A re-implementation of the native `Array#flatten` method.
  # Returns a one-dimensional flattened version of `self`,
  # or flattens it to a degree, specified by `level`.
  #
  # @param level [Number] level of recursion
  # @return [Array] flattened array
  def smoothen(level = -1)
    return self if level == 0