ruby find frequency in of objects in joiner code example
Example: ruby find frequency in array self.all
balls = [m1, m2, m3, m4]
most_idx = nil
groups = balls.inject({}) do |hsh, ball|
hsh[ball.color] = [] if hsh[ball.color].nil?
hsh[ball.color] << ball
most_idx = ball.color if hsh[most_idx].nil? || hsh[ball.color].size > hsh[most_idx].size
hsh
end
groups[most_idx] # => [m1,m2,m4]