Bump to v4.0.0.

isEmpty.js

@@ -0,0 +1,39 @@
+import isFunction from './isFunction';
+import isObjectLike from './isObjectLike';
+import keys from './keys';
+import size from './size';
+
+/**
+ * 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) {
+  return (!isObjectLike(value) || isFunction(value.splice))
+    ? !size(value)
+    : !keys(value).length;
+}
+
+export default isEmpty;