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GeezerVison is showing github.com — JavaScript/Maths/BinaryExponentiationRecursive.js at master · TheAlgorithms/JavaScript

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/*
Modified from:
https://github.com/TheAlgorithms/Python/blob/master/maths/binary_exponentiation.py
Explanation:
https://en.wikipedia.org/wiki/Exponentiation_by_squaring
*/
export const binaryExponentiation = (a, n) => {
// input: a: int, n: int
// returns: a^n: int
if (n === 0) {
return 1
} else if (n % 2 === 1) {
return binaryExponentiation(a, n - 1) * a
} else {
const b = binaryExponentiation(a, n / 2)
return b * b
}
}
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