gistfile1.rb

Write a method mode which takes an Array of numbers
as its input and returns an Array of the most frequent values.

If there's only one most-frequent value, it returns a
 single-element Array.

For example,

mode([1,2,3,3])         # => [3]
mode([4.5, 0, 0])       # => [0]
mode([1.5, -1, 1, 1.5]) # => [1.5]
mode([1,1,2,2])         # => [1,2]
mode([1,2,3])           # => [1,2,3], because all occur with
                                      equal frequency


def mode(array) 
  f = Hash.new(0)

  array.each do |x|
    f[x] += 1
  end

  max = 0 
  modes = [] 
  f.each do |key, value|  
    if value > max 
      modes = [key] 
      max = value 
    elsif value == max 
      modes.push(key) 
    end 
  end
   
  modes 
end