add challenge

Author: igorvidottof

freeCodeCamp/intermediate-algorithm-scripting/sum-all-primes.js

@@ -0,0 +1,20 @@
+function isPrime(number) {
+  var start = 2;
+  while (start <= Math.sqrt(number)) {
+    if(number % start++ < 1) return false;
+  }
+  return true;
+}
+
+function sumPrimes(num) {
+  var sum = 0;
+  for(var i = 2; i <= num; i++) {
+    if(isPrime(i)) {
+      sum += i;
+    }
+  }
+  return sum;
+}
+
+// test
+sumPrimes(10);