lodash mixin: _.isSet() - Checks whether a value is undefined, null, empty string, empty array, or empty object.

isset.mixin.js

/**
 * Lodash Mixin Util: isSet
 * @description Returns flag whether value is - undefined null, empty string, empty array, or empty object
 * @param {*} val - Value to Check
 * @author Timothy A. Perez <tim.adam.perez@gmail.com>
 */
(function () {
	function isSet(val) {
		return (! ((_.isUndefined(val) || val === null) || (_.isArray(val) && val.length === 0) || (_.isObject(val) && _.isEmpty(val)) || (_.isString(val) && val === '')) );
	}

	_.mixin({'isSet': isSet});
})();