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feat(tool): roman-arabic numbers converter

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Corentin Thomasset 2022-04-04 23:33:39 +02:00
parent 3ae61147a9
commit 655019cf23
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18
src/tools/roman-numeral-converter/roman-numeral-converter.service.ts Normal file
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export function arabicToRoman(num: number) {
if (num < 1) return '';
const lookup: { [key: string]: number } = { M: 1000, CM: 900, D: 500, CD: 400, C: 100, XC: 90, L: 50, XL: 40, X: 10, IX: 9, V: 5, IV: 4, I: 1 };
let roman = '';
for (const i in lookup) {
while (num >= lookup[i]) {
roman += i;
num -= lookup[i];
}
}
return roman;
}
export function romanToArabic(s: string) {
const map: { [key: string]: number } = { I: 1, V: 5, X: 10, L: 50, C: 100, D: 500, M: 1000 };
return [...s].reduce((r, c, i, s) => (map[s[i + 1]] > map[c] ? r - map[c] : r + map[c]), 0);
}