worc

function formatN (n) {
	const unitList = ['y', 'z', 'a', 'f', 'p', 'n', 'μ', 'm', '', 'k', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y'];
	const zeroIndex = 8;
	const nn = n.toExponential(2).split(/e/);
	let u = Math.floor(+nn[1] / 3) + zeroIndex;
	if (u > unitList.length - 1) {
		u = unitList.length - 1;
	} else
	if (u < 0) {
		u = 0;