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], b…

Calculating the array mode

def mode(array)
  count = Hash.new(0)
  array.each { |element| count[element] += 1 }  #count how many times an element[s] appears the most
  # element of the array => number of times element occured in an array
  # ex. {5 => 2, 6 =>2, 7 =>1}
  max = count.values.max
  count.keep_if { |key, val| val == max}
  # count is {5 => 2, 6 =>2}
  count.keys  #return an array of those elements
end

#p mode ([5,5,6,6,7})
#alt

def mode(array)
  array.group_by {|num| array.count(num)}.max.last.uniq
end