diff --git a/Recursive/Factorial.js b/Recursive/Factorial.js
index 5d882e5ea4..5a0d560514 100644
--- a/Recursive/Factorial.js
+++ b/Recursive/Factorial.js
@@ -9,6 +9,14 @@
*/
const factorial = (n) => {
+ if (!Number.isInteger(n)) {
+ throw new RangeError('Not a Whole Number')
+ }
+
+ if (n < 0) {
+ throw new RangeError('Not a Positive Number')
+ }
+
if (n === 0) {
return 1
}
diff --git a/Recursive/test/Factorial.test.js b/Recursive/test/Factorial.test.js
index b124efea5e..5f32a44332 100644
--- a/Recursive/test/Factorial.test.js
+++ b/Recursive/test/Factorial.test.js
@@ -8,4 +8,12 @@ describe('Factorial', () => {
it('should return factorial 120 for value "5"', () => {
expect(factorial(5)).toBe(120)
})
+
+ it('Throw Error for Invalid Input', () => {
+ expect(() => factorial('-')).toThrow('Not a Whole Number')
+ expect(() => factorial(null)).toThrow('Not a Whole Number')
+ expect(() => factorial(undefined)).toThrow('Not a Whole Number')
+ expect(() => factorial(3.142)).toThrow('Not a Whole Number')
+ expect(() => factorial(-1)).toThrow('Not a Positive Number')
+ })
})
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