completes factorial

Author: umbur

factorial.js

@@ -0,0 +1,23 @@
+// Write a function that takes a positive integer and return its factorial.
+// Examples:
+// factorial(4) ➞ 24
+// factorial(0) ➞ 1
+// factorial(9) ➞ 362880
+// Notes:
+// The factorial of 0 is 1.
+// The factorial of any positive integer Z is Z * (Z - 1) * (Z - 2) * . . . . . . * 1 (e.g. factorial of 3 is 3 * 2 * 1 = 6).
+
+function factorial(z) {
+  let total = 1;
+  if (z == 0) {
+    return 1;
+  } else {
+    for (let i = 0; i < z; z--) {
+      total *= z;
+    }
+  }
+  return total;
+}
+console.log(factorial(4));
+console.log(factorial(0));
+console.log(factorial(9));

js_draft.js

@@ -109,7 +109,12 @@
 // }
 // console.log(additiveInverse([5, -7, 8, 3]));
 
-function repetition(txt, n) {
-  return txt.repeat(n);
+// function repetition(txt, n) {
+//   return txt.repeat(n);
+// }
+// console.log(repetition("ab", 3));
+
+function filterArray(arr) {
+  return arr.filter((n) => typeof n == "number");
 }
-console.log(repetition("ab", 3));
+console.log(filterArray([1, 2, "a", "b"]));