Bump to v3.0.0.

lang/isEmpty.js

@@ -0,0 +1,43 @@
+define(['./isArguments', './isArray', './isFunction', '../internal/isLength', '../internal/isObjectLike', './isString', '../object/keys'], function(isArguments, isArray, isFunction, isLength, isObjectLike, isString, 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;
+  }
+
+  return isEmpty;
+});