"Calculating the array mode"

gistfile1.txt

def mode(array)
  array.group_by do |e|
    e
  end.values.max_by(&:size).first
end
---------------------------------
def mode(array)
  array.inject(Hash.new(0)){ |h,i| h[i] += 1; h }.max{ |a,b| a[1] <=> b[1] }.first
end
---------------------------------
def mode(array)
  array.group_by{|a| a }.sort_by{|a,b| b.size<=>a.size}.first[0]
end

SOLUTION:

def mode(array)
box = Hash.new(0)
popular = []
array.each { |value| box[value] += 1 }
box.each { |key, value| popular.push(key) if value == box.values.max }
popular
end