View difference between Paste ID: 1vPagnH4 and XtwyH3tr

-function arraySum(arr) {
+// declare function arraySum
-    var sum, i, j, cur;
+function arraySum(i) {
 // var curentVal will hold current value of i[j] member
-    sum = 0;
+// at first value of sum is ZERO
 var sum = 0;
-    for (i = 0, j = arr.length; i < j; i++) {
+    // i will be an array, containing integers, strings and/or arrays like itself.
-        cur = arr[i];
+    // Sum all the integers you find, anywhere in the nest of arrays.
-
+
-        if (cur instanceof Array) {
+    for(var j = 0; j < i.length; j++) {
-            sum += arraySum(cur);
+        // curentVal = i[j];
-        } else if (typeof cur === "number") {
+// if curentVal of i[j] is Array
-            sum += cur;
+        if(i[j] instanceof Array) {
             sum += arraySum(i[j]);
         } else if (typeof i[j] === 'number') {
             sum += i[j];
         }
     }
     return sum;
 }
 
 console.log(arraySum([[1,2,false],'4','5']));    // 3
 console.log(arraySum([[1,2,3],4,5]));            // 15
 console.log(arraySum([[[[[[[[[1]]]]]]]], 1]));    // 2