Flattens an array of arbitrarily nested arrays of integers into a flat array of integers

flatten_array.rb

# Flattens an array of arbitrarily nested arrays of integers into a flat array of integers
#
# Algorithm:
#   1. Iterate over each element in the array.
#   2. If the element contains nested array elements, apply the same function recursively to each elements.
#   3. For integer values, push them into a flat array
#
# @param array[Array], nested array to be flattened
# @return [Array], flattened array
def flatten(array)
  array.reduce([]) do |acc, elem|
    Array === element ? acc += flatten(elem) : acc << elem
  end
end