roman to number

Author: mgable

numberToRoman-2.js

@@ -0,0 +1,30 @@
+let roman = {
+  "I":1,
+  "V":5,
+  "X":10,
+  "L":50,
+  "C":100,
+  "D":500,
+  "M":1000,
+}
+
+
+/**
+ * @param {string} s
+ * @return {number}
+ */
+var romanToInt = function(s) {
+    let arr = s.split(""), prev = Number.MAX_SAFE_INTEGER
+
+    return arr.reduce((acc, i) => {
+      let value = roman[i]
+      if (value > prev)
+      {
+        acc+= (value - prev ) - prev
+      } else {
+        acc+= roman[i]
+      }
+      prev = value
+      return acc
+    }, 0)
+};

romanToNumber.js

@@ -0,0 +1,27 @@
+/**
+ * @param {string} s
+ * @return {number}
+ */
+var romanToInt = function(s) {
+    let key = {"I": 1,
+    "V": 5,
+      "X": 10,
+      "L": 50,
+      "C": 100,
+      "D": 500,
+      "M": 1000
+    }, sum = 0, last;
+      
+  s.split("").forEach((num) => {
+      if (last && key[last] < key[num]){
+          sum -=  key[last]
+          sum += key[num] - key[last]
+      } else {
+        sum += key[num]
+      }
+      last = num
+  });
+
+  return sum
+
+};