Merge LibSi(e)ve with JS++

jspp.js

@@ -26,6 +26,30 @@ class JSPlusPlus {
 		          return t
             }
 
+            isPrime = num => {
+              for(let i = 2, s = Math.sqrt(num); i <= s; i++) {
+                  if(num % i === 0) return false;
+              }
+              return num > 1;
+            }
+          
+            sieve(siveTo) {
+              let primes = []
+              siveTo = Number(siveTo)
+          
+              for (var i = 1; i < siveTo; i++) {
+                  if (isPrime(i)) {
+                          primes.push(i)
+                  }
+              }
+          
+              if (isPrime(siveTo)) {
+                  primes.push(siveTo)
+              }
+          
+              return primes
+            }
+            
             async asyncSleep(ms) {
                 await new Promise(r => setTimeout(r, ms));
             }