Extract element data attributes and return as an object [ES6]

main.js

/**
 * Extract only data attributes from an element (or a jQuery element) and return it as an object
 * @param  {Element}  el       JS raw element or jQuery element
 * @param  {String}  dataTag   data key from extract the rest. Could start with "data-" or not
 * @param  {Boolean} camelCase keys returned camelCased or not
 * @return {Object}
 * 
 * IMPORTANT: It use lodash/underscore as a dependency!
 * IMPORTANT: Made in ES6
 *
 * Ex: <p data-foo-theme="main" data-foo-hide="false" data-foo-timeout="500"></p>
 *
 * Will return:
 * {
 * 	fooTheme: 'main',
 * 	fooHide: false,
 * 	fooTimeout: 500
 * }
 * 
 */
function getDatas( el, dataTag='', camelCase=true ) {

	if(!el) throw new Error('Element is undefined');

	let datas = _.isElement(el) ? el.attributes : el[0].attributes,
		options = {};

	if(!datas || !datas.length) return {};

	_.each(datas, (value, key) => {
		let nodeName = value.nodeName,
			nodeValue = value.nodeValue,
			dataSelector = nodeName.indexOf('data-') === -1 ? `data-${dataTag}` : dataTag;

		// parse to boolean: true
		if(nodeValue === 'true') nodeValue = !!nodeValue;

		// parse to boolean: false
		if(nodeValue === 'false') nodeValue = !nodeValue;

		// parse to number
		if(!_.isArray( nodeValue ) && (nodeValue - parseFloat( nodeValue ) + 1) >= 0)
			nodeValue = parseInt(nodeValue, 10);

		// create data object
		if(nodeName.indexOf(dataSelector) !== -1) {
			let prop = nodeName.split(dataSelector)[1],
				camelCased = camelCase ? _.camelCase(prop) : prop;
			options[camelCased] = nodeValue;
		}
	});

	return options;
}