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22 lines
609 B
JavaScript
22 lines
609 B
JavaScript
/*
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Factorial digit sum
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n! means n × (n − 1) × ... × 3 × 2 × 1
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For example, 10! = 10 × 9 × ... × 3 × 2 × 1 = 3628800,
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and the sum of the digits in the number 10! is 3 + 6 + 2 + 8 + 8 + 0 + 0 = 27.
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Find the sum of the digits in the number 100!
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*/
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const findFactorialDigitSum = (num) => {
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let result = 0
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const stringifiedNumber = factorize(num).toLocaleString('fullwide', { useGrouping: false })
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stringifiedNumber.split('').map(num => { result += Number(num) })
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return result
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}
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const factorize = (num) => num === 0 ? 1 : num * factorize(num - 1)
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console.log(findFactorialDigitSum(100))
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