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Task/Sieve-of-Eratosthenes/JavaScript/sieve-of-eratosthenes.js

@@ -0,0 +1,27 @@
+function erasthenes(limit) {
+    var primes = [];
+    if (limit >= 2) {
+        var nums = new Array(limit-1);
+        for (var i = 2; i <= limit; i++)
+            nums[i-2] = i;
+
+        var last_prime;
+        var idx = 0;
+        while ((last_prime = nums[idx]) <= Math.sqrt(limit)) {
+            if (last_prime != null)
+                for (var i = idx + last_prime; i < limit - 1; i += last_prime)
+                    nums[i] = null;
+            idx++;
+        }
+        for (var i = 0; i < nums.length; i++)
+            if (nums[i] != null)
+                primes.push(nums[i]);
+    }
+    return primes;
+}
+
+var primes = erasthenes(100);
+
+if (typeof print == "undefined")
+    print = (typeof WScript != "undefined") ? WScript.Echo : alert;
+print(primes);