flatten.rb

def flatten(array)
  a = [] #Must store elements somewhere
  array.each do |x|  #Go Through each element
    if x.class != Array #If the Element is Not an Array
      a << x #Store Element in Array 'a'
    else
      a += flatten(x) #Add flattened array to previous array
    end
  end
  return a #When all elements are non-arrays, return new array filled with non-array elements
end

array = ["bananas", [1,2,3], ["apple", "cheese", [100, 20]], [true], [4.0, 7, 32]]
puts flatten(array).inspect