feat: core chunk 4

src/core/math/numberToRomanNumeral.ts

@@ -0,0 +1,32 @@
+/**
+ * Thanks, August!
+ * https://stackoverflow.com/a/41358305/12294756
+ */
+const ROMAN = {
+  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,
+};
+const ROMAN_KEYS = Object.keys(ROMAN) as (keyof typeof ROMAN)[];
+
+export default function numberToRomanNumeral(value: number) {
+  let string = '';
+
+  ROMAN_KEYS.forEach((index) => {
+    const part = Math.floor(value / ROMAN[index]);
+    value -= part * ROMAN[index];
+    string += index.repeat(part);
+  });
+
+  return string;
+}