Bump to v4.0.0.

wrapperAt.js

@@ -0,0 +1,48 @@
+import LazyWrapper from './internal/LazyWrapper';
+import LodashWrapper from './internal/LodashWrapper';
+import baseAt from './internal/baseAt';
+import baseFlatten from './internal/baseFlatten';
+import isIndex from './internal/isIndex';
+import rest from './rest';
+import thru from './thru';
+
+/**
+ * This method is the wrapper version of `_.at`.
+ *
+ * @name at
+ * @memberOf _
+ * @category Seq
+ * @param {...(string|string[])} [paths] The property paths of elements to pick,
+ *  specified individually or in arrays.
+ * @returns {Object} Returns the new `lodash` wrapper instance.
+ * @example
+ *
+ * var object = { 'a': [{ 'b': { 'c': 3 } }, 4] };
+ *
+ * _(object).at(['a[0].b.c', 'a[1]']).value();
+ * // => [3, 4]
+ *
+ * _(['a', 'b', 'c']).at(0, 2).value();
+ * // => ['a', 'c']
+ */
+var wrapperAt = rest(function(paths) {
+  paths = baseFlatten(paths);
+  var length = paths.length,
+      start = length ? paths[0] : 0,
+      value = this.__wrapped__,
+      interceptor = function(object) { return baseAt(object, paths); };
+
+  if (length > 1 || this.__actions__.length || !(value instanceof LazyWrapper) || !isIndex(start)) {
+    return this.thru(interceptor);
+  }
+  value = value.slice(start, +start + (length ? 1 : 0));
+  value.__actions__.push({ 'func': thru, 'args': [interceptor], 'thisArg': undefined });
+  return new LodashWrapper(value, this.__chain__).thru(function(array) {
+    if (length && !array.length) {
+      array.push(undefined);
+    }
+    return array;
+  });
+});
+
+export default wrapperAt;