function minMax(items) {
	return items.reduce((acc, val) => {
		acc[0] = acc[0] === undefined || val < acc[0] ? val : acc[0];
		acc[1] = acc[1] === undefined || val > acc[1] ? val : acc[1];
		console.log(acc);
		return acc;
	}, []);
}

console.log(minMax([ 3, 98, 1, 6, 100 ]));