src/algorithms/math/factorial/__test__/factorialRecursiveTCO.test.js

@@ -0,0 +1,11 @@
+import factorialRecursiveTCO from '../factorialRecursiveTCO';
+
+describe('factorialRecursiveTCO', () => {
+  it('should calculate factorial', () => {
+    expect(factorialRecursiveTCO(0)).toBe(1);
+    expect(factorialRecursiveTCO(1)).toBe(1);
+    expect(factorialRecursiveTCO(5)).toBe(120);
+    expect(factorialRecursiveTCO(8)).toBe(40320);
+    expect(factorialRecursiveTCO(10)).toBe(3628800);
+  });
+});

src/algorithms/math/factorial/factorialRecursiveTCO.js

@@ -0,0 +1,12 @@
+/**
+ * @param {number} number
+ * @return {number}
+ */
+ export default function factorialRecursiveTCO(number) {
+  function fact(number, accumulator = 1) {
+    if (number < 2) return accumulator;
+    else return fact(number - 1, accumulator * number);
+  }
+
+  return fact(number);
+}