Update Additive Persistence

Author: abx20

Additive Persistence

@@ -24,22 +24,11 @@
 *    4) Return number of loops as answer                                               *
 *                                                                                      *
 ***************************************************************************************/
-
-function AdditivePersistence(num) { 
-
-    var sum, loop = 0;
-    var val1 = num.toString(10).split("").map(function(t){return parseInt(t)});
-   
-    while (val1.length > 1) {
-        sum = 0;
-        val1.forEach( function(number) {
-            sum = sum + number;
-        });
-        
-        val1 = sum.toString(10).split("").map(function(t){return parseInt(t)});
-        loop++;
-    } 
-    
-    return loop;
-         
+function additivePersistence(num) {
+  let count = 0;
+  while (num >= 10) {
+    num = num.toString().split('').reduce((sum, digit) => sum + parseInt(digit), 0);
+    count++;
+  }
+  return count;
 }