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index.ts
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index.ts
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export default function romanToInt(s: string): number {
let result = 0;
let index = 0;
while (index < s.length) {
if (![...one_char_to_num.keys()].includes(s[0])) {
throw Error("unexpeted");
}
loop: {
// console.log(loop)
for (const map of [two_char_to_num, one_char_to_num]) {
for (const [char, num] of map) {
if (s.length === 0) break;
// console.log(s, char, num)
if (char === s.slice(index, char.length + index)) {
// console.log(s, char, num)
result += num;
// s = s.slice(char.length)
index += char.length;
break loop;
}
}
}
}
}
return result;
}
const one_char_to_num = new Map<string, number>([
["M", 1000],
["I", 1],
["V", 5],
["X", 10],
["L", 50],
["C", 100],
["D", 500],
]);
const two_char_to_num = new Map<string, number>([
["CM", 900],
["IV", 4],
["IX", 9],
["XL", 40],
["XC", 90],
["CD", 400],
]);
// console.log(romanToInt("MCMXCIV"))