gsender

/*
 * Copyright (C) 2021 Sienci Labs Inc.
 *
 * This file is part of gSender.
 *
 * gSender is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, under version 3 of the License.
 *
 * gSender is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with gSender.  If not, see <https://www.gnu.org/licenses/>.
 *
 * Contact for information regarding this program and its license
 * can be sent through gSender@sienci.com or mailed to the main office
 * of Sienci Labs Inc. in Waterloo, Ontario, Canada.
 *
 */

// http://stackoverflow.com/questions/10454518/javascript-how-to-retrieve-the-number-of-decimals-of-a-string-number
const decimalPlaces = (num) => {
	const match = ("" + num).match(/(?:\.(\d+))?(?:[eE]([+-]?\d+))?$/);
	if (!match) {
		return 0;
	}

	// Number of digits right of decimal point.
	const digits = match[1] ? match[1].length : 0;

	// Adjust for scientific notation.
	const E = match[2] ? +match[2] : 0;

	return Math.max(0, digits - E);
};

export default decimalPlaces;