Codewars Challenge: Find Count of Most Frequent Item in Array

count_most_frequent.rb

# Write a program to find count of the most frequent item of an array.

# Assume that input is array of integers.

# Ex.:

# input array: [3, -1, -1, -1, 2, 3, -1, 3, -1, 2, 4, 9, 3]
# ouptut: 5
# Most frequent number in example array is -1. It occurs 5 times in input array.
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#My Solution:

def most_frequent_item_count(collection)
  return 0 if collection == []
  hist = collection.each_with_object(Hash.new(0)){ |num, freq| freq[num] += 1 }
  hist.values.max
end