Problem 1 with function

problem1.js

@@ -4,15 +4,15 @@ Problem 1: Multiples of 3 and 5
 If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
 Find the sum of all the multiples of 3 or 5 below 1000. */
 
-var sum = 0;
-var array = [];
-
-for (i=1; i<1000; i++) {
-  if (i%3 === 0 || i%5 === 0) {
-    sum += i;
-    array.push(i);
+function solution1(number){
+  var sum = 0;
+  
+  for(var i = 1;i< number; i++){
+    if(i % 3 == 0 || i % 5 == 0){
+      sum += i
+    }
   }
+  return sum;
 }
 
-console.log("All natural numbers below 1000 that are multiples of 3 or 5 are: " + array);
-console.log("The sum of these multiples is: " + sum);
+solution1(1000);