some leetcode problem, just to share in chat

isMonotonic.go

func isMonotonic(nums []int) bool {

	direction := 0

	if len(nums) == 1 {
		return true
	}

	for i := 0; i < len(nums); i++ {
		if i+1 == len(nums) {
			break
		}

		if direction == 0 {
			if nums[i] > nums[i+1] {
				direction = -1
			}
			if nums[i] < nums[i+1] {
				direction = 1
			}

		} else {
			if direction == 1 && nums[i] > nums[i+1] {
				return false

			}

			if direction == -1 && nums[i] < nums[i+1] {
				return false
			}
		}
	}
	return true
}