Merge pull request #600 from raklaptudirm/master

Added `sqrt()` function. Changes Approved by @marsonya

Author: raklaptudirm

Maths/SquareRoot.js

@@ -0,0 +1,19 @@
+/*
+* 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 = 10) {
+  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 }