13

Author: OmPreetham

13-roman-to-integer.js

@@ -0,0 +1,30 @@
+/**
+ * @param {string} s
+ * @return {number}
+ */
+var romanToInt = function(s) {
+    const romanMap = {
+        'I': 1,
+        'V': 5,
+        'X': 10,
+        'L': 50,
+        'C': 100,
+        'D': 500,
+        'M': 1000
+    }
+
+    let total = 0;
+
+    for (let i = 0; i < s.length; i++) {
+        const currValue = romanMap[s[i]];
+        const nextValue = romanMap[s[i + 1]];
+
+        if (currValue < nextValue) {
+            total -= currValue;
+        } else {
+            total += currValue;
+        }
+    }
+    
+    return total;
+};