nFormatter (number format with k and m)

nFormatter.js

function nFormatter(num, digits) {
	const si = [
		{ value: 1, symbol: "" },
		{ value: 1E3, symbol: "k" },
		{ value: 1E6, symbol: "M" },
		{ value: 1E9, symbol: "G" },
		{ value: 1E12, symbol: "T" },
		{ value: 1E15, symbol: "P" },
		{ value: 1E18, symbol: "E" }
	];
	const rx = /\.0+$|(\.[0-9]*[1-9])0+$/;
	let i;
	for (i = si.length - 1; i > 0; i--) {
		if (num >= si[i].value) {
			break;
		}
	}
	return (num / si[i].value).toFixed(digits).replace(rx, "$1") + si[i].symbol;
}