[ADD] sum all primes added

luisprooc · luisprooc · commit 0210050ae7c5 · 2021-07-08T11:59:33.000-04:00
diff --git a/README.md b/README.md
@@ -611,4 +611,20 @@ sumFibs(75024) should return 60696.
 
 sumFibs(75025) should return 135721.
 
+```
+
+
+## Sum All Primes
+
+A prime number is a whole number greater than 1 with exactly two divisors: 1 and itself. For example, 2 is a prime number because it is only divisible by 1 and 2. In contrast, 4 is not prime since it is divisible by 1, 2 and 4.
+
+Rewrite sumPrimes so it returns the sum of all prime numbers that are less than or equal to num.
+
+```javascript
+sumPrimes(10) should return a number.
+
+sumPrimes(10) should return 17.
+
+sumPrimes(977) should return 73156.
+
 ```
diff --git a/src/sumPrimes.js b/src/sumPrimes.js
@@ -0,0 +1,21 @@
+function sumPrimes(num) {
+    let sum = 0;
+    let prime = false;
+    for(let i = 2; i <= num; ++i){
+        for(let j = 1; j < i; ++j){
+            if(i % j === 0 && j > 1){
+                prime = false;
+                break;
+            }
+            else{
+                prime = true;
+            }
+        }
+        if(prime){
+            sum += i;
+        }
+    }
+    return sum;
+}
+  
+console.log(sumPrimes(977));
