Roman to interger
var romanToInt = function (s) {
const converter = value => {
switch (value) {
case 'I':
return 1
case 'IV':
return 4
case 'V':
return 5
case 'IX':
return 9
case 'X':
return 10
case 'XL':
return 40
case 'L':
return 50
case 'XC':
return 90
case 'C':
return 100
case 'CD':
return 400
case 'D':
return 500
case 'CM':
return 900
case 'M':
return 1000
default:
break
}
}
let sum = 0
const arrRoman = s.split('')
const checkArr = [...arrRoman]
for (let index in arrRoman) {
if (+index + 1 < checkArr.length) {
if (
(arrRoman[index] === 'I' && arrRoman[+index + 1] === 'V') ||
(arrRoman[index] === 'I' && arrRoman[+index + 1] === 'X') ||
(arrRoman[index] === 'X' && arrRoman[+index + 1] === 'L') ||
(arrRoman[index] === 'X' && arrRoman[+index + 1] === 'C') ||
(arrRoman[index] === 'C' && arrRoman[+index + 1] === 'D') ||
(arrRoman[index] === 'C' && arrRoman[+index + 1] === 'M')
) {
arrRoman.splice(index, 2, arrRoman[index] + arrRoman[+index + 1])
}
}
}
for (let romNum of arrRoman) {
sum += converter(romNum)
}
return sum
}
var romanToInt = function(str) {
const code = {
'I': 1,
'V': 5,
'X': 10,
'L': 50,
'C': 100,
'D': 500,
'M': 1000
}
let total = 0;
for (let i = 0; i < str.length; i++) {
let current = code[str[i]];
let next = code[str[i + 1]];
if (current < next) {
total -= current;
} else {
total += current;
}
}
return total;
};