roman to int

Author: AdebsAlert

Roman to integer/romanToInt.js

@@ -0,0 +1,39 @@
+// PSEUDOCODE
+
+/**
+ * 
+ * create a hash map with the value of each synol in the roman numeral
+ * initiale the result number with 0
+ * iterate the roman string
+ * check the current string value in the hash if its less than the next character value
+ * if its less than the next, subtract it from the next character. (case of IV)
+ * 
+ */
+
+ var romanToInt = function (s) {
+    const romanHash = {
+        'I': 1,
+        'V': 5,
+        'X': 10,
+        'L': 50,
+        'C': 100,
+        'D': 500,
+        'M': 1000,
+    };
+
+    let result = 0;
+
+    for(let i = 0, len = s.length; i < len; i++) {
+        const currentVal = romanHash[s[i]];
+        const nextCharVal = romanHash[s[i + 1]];
+
+        if(currentVal < nextCharVal) {
+            result += nextCharVal - currentVal;
+            i++
+        }else{
+            result += currentVal;
+        }
+    }
+
+    return result;
+}