jQuery plugin determining if an element contains named data-attributes and that their values are non empty

hasDataAttrib.js

$.fn.extend({
	
	/**
	 * jQuery plugin determining if an element contains named data-attributes and that their values are non empty
	 * Usage:
	 * 
	 * <button id="myButton" data-country="australia" data-city="sydney" data-some-empty-value="">
	 * 
	 * $('#myButton').hasDataAttrib('country') // true
	 * $('#myButton').hasDataAttrib('data-country') // true
	 * $('#myButton').hasDataAttrib(['country']) // true
	 * $('#myButton').hasDataAttrib(['data-country']) // true
	 * $('#myButton').hasDataAttrib('some-empty-value']) // false
	 * $('#myButton').hasDataAttrib(['country', 'city']) // true
	 * $('#myButton').hasDataAttrib('banana') // false
	 * $('#myButton').hasDataAttrib(['country', banana']) // false
	 * 
	 * @param {string|array} attribs A single attribute or an array of attributes.
	 * @returns {boolean}
	 */
	hasDataAttrib: function (attribs) {
		
		if(typeof _ === 'undefined'){
			throw new Error('jQuery plugin hasDataAttrib requires lodash.');
		}
		
		var test = function($el, attrib){
			
			// Removes the "data-" part of the attribute if present
			if(attrib.indexOf('data-') !== -1){
				attrib = attrib.substr(5, attrib.length);
			}

			return !_.isUndefined($el.data(attrib)) && String($el.data(attrib)).length !== 0;
		};
		
		var $target = this,
			res = true;

		if($target.length === 0){
			throw new Error('Selector expected')
		}

		if($target.length > 1){
			throw new Error('Multiple selectors not supported')
		}

		if(_.isUndefined(attribs)){
			throw new Error('Parameter attribute expected')
		}
		
		if(_.isString(attribs)){
			return test($target, attribs);
		}
		
		else if(_.isArray(attribs)){
			_.each(attribs, function(attrib){
				if(!test($target, attrib)){
					res = false;
				}
			});
		}
		
		else{
			throw new Error('String or Array expected for parameter attrib');
		}
		
		return res;
	}
});