isEmpty.js
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define(['./isArguments', './isArray', '../internal/isArrayLike', './isFunction', '../internal/isObjectLike', './isString', '../object/keys'], function(isArguments, isArray, isArrayLike, isFunction, isObjectLike, isString, keys) {
/**
* Checks if `value` is empty. A value is considered empty unless it's an
* `arguments` object, array, string, or jQuery-like collection with a length
* greater than `0` or an object with own enumerable properties.
*
* @static
* @memberOf _
* @category Lang
* @param {Array|Object|string} value The value to inspect.
* @returns {boolean} Returns `true` if `value` is empty, else `false`.
* @example
*
* _.isEmpty(null);
* // => true
*
* _.isEmpty(true);
* // => true
*
* _.isEmpty(1);
* // => true
*
* _.isEmpty([1, 2, 3]);
* // => false
*
* _.isEmpty({ 'a': 1 });
* // => false
*/
function isEmpty(value) {
if (value == null) {
return true;
}
if (isArrayLike(value) && (isArray(value) || isString(value) || isArguments(value) ||
(isObjectLike(value) && isFunction(value.splice)))) {
return !value.length;
}
return !keys(value).length;
}
return isEmpty;
});