romannumbers update

src/romannumbers.js

@@ -1,16 +1,45 @@
 // Реализовать создание следующую запись ;]
 // ...
 
-Number.prototype.I =    Array.from(Array(1).keys())
+const romanToDecMap = {
-Number.prototype.II =   Array.from(Array(2).keys())
+    'I': 1,
-Number.prototype.III =  Array.from(Array(3).keys())
+    'V': 5,
-Number.prototype.IV =   Array.from(Array(4).keys())
+    'X': 10,
-Number.prototype.V =    Array.from(Array(5).keys())
+    'L': 50,
-Number.prototype.VI =   Array.from(Array(6).keys())
+    'C': 100,
-Number.prototype.VII =  Array.from(Array(7).keys())
+    'D': 500,
-Number.prototype.VIII = Array.from(Array(8).keys())
+    'M': 1000
-Number.prototype.IX =   Array.from(Array(9).keys())
+}
-Number.prototype.X =    Array.from(Array(10).keys())
+
+function romanToDec(roman) {
+    let res = 0;
+    for (let i = 0; i < roman.length; i++) {
+        cur = romanToDecMap[roman[i]];
+        next = romanToDecMap[roman[i + 1]];
+        if (cur >= next || next === undefined) {
+            res += cur;
+        } else {
+            res += -cur + next;
+            i++;
+        }
+    }
+    return res;
+}
+
+function nArr(n) {
+    return Array.from(Array(n).keys());
+}
+
+const proxyHandler = {
+    get: function (target, prop, receiver) {
+        const n = romanToDec(prop);
+        return nArr(n);
+    }
+};
+
+const proxy =  new Proxy(Number.prototype, proxyHandler);
+Object.setPrototypeOf(Number.prototype, proxy);
+
 
 console.log(0..V);   // [0, 1, 2, 3, 4];
 console.log(0..VII); // [0, 1, 2, 3, 4, 5, 6];