diff --git a/src/algorithms/math/factorial/__test__/factorialRecursiveTCOBigInt.test.js b/src/algorithms/math/factorial/__test__/factorialRecursiveTCOBigInt.test.js new file mode 100644 index 00000000..ab775b38 --- /dev/null +++ b/src/algorithms/math/factorial/__test__/factorialRecursiveTCOBigInt.test.js @@ -0,0 +1,12 @@ +import factorialRecursiveTCOBigInt from '../factorialRecursiveTCOBigInt'; + +describe('factorialRecursiveTCOBigInt', () => { + it('should calculate factorial', () => { + expect(factorialRecursiveTCOBigInt(0n)).toBe(1n); + expect(factorialRecursiveTCOBigInt(1n)).toBe(1n); + expect(factorialRecursiveTCOBigInt(5n)).toBe(120n); + expect(factorialRecursiveTCOBigInt(8n)).toBe(40320n); + expect(factorialRecursiveTCOBigInt(10n)).toBe(3628800n); + expect(factorialRecursiveTCOBigInt(100n)).toBe(93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976156518286253697920827223758251185210916864000000000000000000000000n); + }); +}); diff --git a/src/algorithms/math/factorial/factorialRecursiveTCOBigInt.js b/src/algorithms/math/factorial/factorialRecursiveTCOBigInt.js new file mode 100644 index 00000000..abccb07c --- /dev/null +++ b/src/algorithms/math/factorial/factorialRecursiveTCOBigInt.js @@ -0,0 +1,12 @@ +/** + * @param {bigint} number + * @return {bigint} + */ + export default function factorialRecursiveTCOBigInt(number) { + function fact(number, accumulator = 1n) { + if (number < 2n) return accumulator; + else return fact(number - 1n, accumulator * number); + } + + return fact(number); +}