factorial

Calculates the factorial of a non-negative integer.

Syntax

factorial(n: number): number

Parameters

Name	Type	Description
n	number	Non-negative integer input.

Return

Type	Description
number	The factorial of n.

Example

factorial(5); // 120
factorial(0); // 1

Notes

• Throws TypeError if n is not a non-negative integer.
• The factorial of 0 is 1 by definition.

References

• MDN: Factorial