JavaScript/Maths/SquareRoot.js at master · TheAlgorithms/JavaScript · GitHub

23 lines (21 loc) · 545 Bytes

* Author: Rak Laptudirm

* https://en.wikipedia.org/wiki/Newton%27s_method

* Finding the square root of a number using Newton's method.

function sqrt(num, precision = 4) {

if (!Number.isFinite(num)) {

throw new TypeError(`Expected a number, received ${typeof num}`)

}

if (!Number.isFinite(precision)) {

throw new TypeError(`Expected a number, received ${typeof precision}`)

}

let sqrt = 1

for (let i = 0; i < precision; i++) {

sqrt -= (sqrt * sqrt - num) / (2 * sqrt)

}

return sqrt

}

export { sqrt }

Expand file tree