Roman To Number

roman_to_number.go

func romanToInt(s string) int {
	var result int
	var last byte
	romanToIntMap := map[byte]int{
		'I': 1,
		'V': 5,
		'X': 10,
		'L': 50,
		'C': 100,
		'D': 500,
		'M': 1000,
	}

	for i := len(s) - 1; i >= 0; i-- {
		current := romanToIntMap[s[i]]

		if current >= romanToIntMap[last] {
			result += current
		} else {
			result -= current
		}
		last = s[i]
	}

	return result
}