Added fact.js

Author: sundarcodes

Day-1/fact.js

@@ -0,0 +1,13 @@
+function factorial(n) {
+    var i, sum = 1 ;
+    for (i = 1; i <= n; i++) {
+        sum = sum * i;
+    }
+    return sum;
+}
+
+function fact(n) {
+    return n == 1 ? 1 : n * fact(n - 1)
+}
+console.log(fact(5));
+