Added solution to largest prime factor

solutions/fibonacci-add-even.js

@@ -24,11 +24,11 @@ function fiboAddEven(start, limit) {
     // filter out all items that are even and add them up
     var result = 0;
     fibArray.forEach(function(eachItem){
-        if (eachItem % 2 === 0) result += eachItem; 
+        if (eachItem % 2 === 0) result += eachItem;
     });
 
     return result;
 }
 
 // Test
-// console.log(fiboAddEven(1, 4000000));
+// console.log(fiboAddEven(1, 4000000));

solutions/largest-prime-factor.js

@@ -0,0 +1,25 @@
+//The prime factors of 13195 are 5, 7, 13 and 29.
+//What is the largest prime factor of the number 600851475143 ?
+
+function largestPrimeFactor(originalTarget){
+  if ((typeof originalTarget !== "number" || originalTarget === 0)){
+    return "Arguments supplied to fn fiboEvenAdd must a natural integer";
+  }
+
+  var target = originalTarget;
+  var i = 2;
+  while(i<target) {
+
+  	while(target%i === 0) {
+
+  			(function(newtarget) {
+  					target = newtarget;
+  			 })(target / i)
+  		}
+  					i++;
+  	}
+    return target;
+}
+
+// Test
+// console.log(largestPrimeFactor(600851475143));