@@ -0,0 +1,19 @@
+/*
+    author: Theepag
+ */
+const factorialize = (num) => {
+  // Step 1. variable result to store num
+  let result = num
+  // If num = 0 OR 1, the factorial will return 1
+  if (num === 0 || num === 1) { return 1 }
+  // Step 2. WHILE loop
+  while (num > 1) {
+    num-- // decrement 1 at each iteration
+    result = result * num // or result = result * num;
+  }
+  // Step 3. Return the factorial
+  return result
+}
+// test
+console.log(factorialize(5))
+console.log(factorialize(4))