codewars/go/kyu6/highest_rank_number_in_an_array/k.go

package kata

func HighestRank(nums []int) int {
	counts := make(map[int]int)

	for _, num := range nums {
		counts[num]++
	}

	maxNum, maxCount := -1, 0
	for num, count := range counts {
		if count > maxCount || (count == maxCount && num > maxNum) {
			maxCount = count
			maxNum = num
		}
	}
	return maxNum
}