자바스크립트 큰 수 팩토리얼

자바스크립트에서 큰 수 표현시 e+, e- 등 지수 표현됨.

 

extraLongFactorials(n) {
	let memoization = [BigInt(0), BigInt(1)];

	const factorial = num => (typeof memoization[num] !== 'number')
		? ((num - BigInt(1)) > 0
			? (num * factorial(num - BigInt(1)))
			: BigInt(1)
		)
		: memoization[num]

	return String(factorial(BigInt(n)));
},

100! = 93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976156518286253697920827223758251185210916864000000000000000000000000

 

 

출처 : https://lunarscents.github.io/2019/08/11/extraLongFactorials/