Find square root by dichotomy and newton iteration

Main.hx

class Main {
	public static function main() {
		trace(dichotomySqrt(2));
		trace(newtonSqrt(2));
	}

	static function dichotomySqrt(x:Float):Float {
		if (x < 0) {
			return Math.NaN;
		}

		if (x == 1 || x == 0) {
			return x;
		}

		var L = 0.0;
		var R = Math.max(x, 1);

		while (true) {
			final guessed = (L + R) / 2;
			final squared = guessed * guessed;
			if (Math.abs(squared - x) < 1e-6) {
				return guessed;
			}

			if (squared > x) {
				R = guessed;
			} else {
				L = guessed;
			}
		}
	}

	static function newtonSqrt(x:Float):Float {
		if (x < 0) {
			return Math.NaN;
		}

		if (x == 1 || x == 0) {
			return x;
		}

		var r = 1.0;
		while (Math.abs(r * r - x) > 1e-6) {
			r = (x / r + r) / 2;
		}

		return r;
	}
}