Bump to v3.0.0.

lang/isEmpty.js

@@ -0,0 +1,48 @@
+import isArguments from './isArguments';
+import isArray from './isArray';
+import isFunction from './isFunction';
+import isLength from '../internal/isLength';
+import isObjectLike from '../internal/isObjectLike';
+import isString from './isString';
+import keys from '../object/keys';
+
+/**
+ * Checks if a value is empty. A value is considered empty unless it is 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;
+  }
+  var length = value.length;
+  if (isLength(length) && (isArray(value) || isString(value) || isArguments(value) ||
+      (isObjectLike(value) && isFunction(value.splice)))) {
+    return !length;
+  }
+  return !keys(value).length;
+}
+
+export default isEmpty;