Refactor code with Math.abs.

Author: russom-g

implement-and-rewrite-tests/implement/2-is-proper-fraction.js

@@ -15,10 +15,7 @@
 
 export function isProperFraction(numerator, denominator) {
   // TODO: Implement this function
-
-  if ((numerator < 0) || (denominator < 0))
-    return false;
-  if (numerator < denominator) {
+  if (Math.abs(numerator) < Math.abs(denominator)) {
     return true;
   } else {
     return false;