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gfortaine/digita_root

Created March 10, 2017 13:27
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Sum of Digits / Digital Root
Raw
digita_root
// @flow
const digital_root = (n: number): number =>
n < 10
? n
: digital_root(n.toString(10).split('').reduce((prev, curr) => prev + parseInt(curr, 10), 0));
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