Another update from ingydotnet^djgoku

Task/Perfect-numbers/JavaScript/perfect-numbers-4.js

@@ -0,0 +1,23 @@
+(function (nFrom, nTo) {
+
+  function perfect(n) {
+    var lows = range(1, Math.floor(Math.sqrt(n))).filter(function (x) {
+      return (n % x) === 0;
+    });
+
+    return n > 1 && lows.concat(lows.map(function (x) {
+      return n / x;
+    })).reduce(function (a, x) {
+      return a + x;
+    }, 0) / 2 === n;
+  }
+
+  function range(m, n) {
+    return Array.apply(null, Array(n - m + 1)).map(function (x, i) {
+      return m + i;
+    });
+  }
+
+  return range(nFrom, nTo).filter(perfect)
+
+})(1, 10000);