Add exception testing to romanNumeralTranslator.js

fay-jai · Jan 3, 2015 · 4f9a48e · 4f9a48e
1 parent 70fde1f
commit 4f9a48e
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/romanNumeralTranslator/romanNumeralTranslator.js b/romanNumeralTranslator/romanNumeralTranslator.js
@@ -41,6 +41,7 @@ var translateRomanNumeral = function (romanNumeral) {
   for (i = 0; i < len - 1; i += 1) {
     current = DIGIT_VALUES[ romanNumeral[i] ];
     next    = DIGIT_VALUES[ romanNumeral[i + 1] ];
+    if ( current === void 0 || next === void 0 ) throw new Error('Invalid roman numeral characters');
 
     result += (current >= next ? current : -current);
   }