Bump to v4.1.0.

_initCloneByTag.js

@@ -0,0 +1,74 @@
+var cloneBuffer = require('./_cloneBuffer'),
+    cloneMap = require('./_cloneMap'),
+    cloneRegExp = require('./_cloneRegExp'),
+    cloneSet = require('./_cloneSet'),
+    cloneSymbol = require('./_cloneSymbol'),
+    cloneTypedArray = require('./_cloneTypedArray');
+
+/** `Object#toString` result references. */
+var boolTag = '[object Boolean]',
+    dateTag = '[object Date]',
+    mapTag = '[object Map]',
+    numberTag = '[object Number]',
+    regexpTag = '[object RegExp]',
+    setTag = '[object Set]',
+    stringTag = '[object String]',
+    symbolTag = '[object Symbol]';
+
+var arrayBufferTag = '[object ArrayBuffer]',
+    float32Tag = '[object Float32Array]',
+    float64Tag = '[object Float64Array]',
+    int8Tag = '[object Int8Array]',
+    int16Tag = '[object Int16Array]',
+    int32Tag = '[object Int32Array]',
+    uint8Tag = '[object Uint8Array]',
+    uint8ClampedTag = '[object Uint8ClampedArray]',
+    uint16Tag = '[object Uint16Array]',
+    uint32Tag = '[object Uint32Array]';
+
+/**
+ * Initializes an object clone based on its `toStringTag`.
+ *
+ * **Note:** This function only supports cloning values with tags of
+ * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.
+ *
+ * @private
+ * @param {Object} object The object to clone.
+ * @param {string} tag The `toStringTag` of the object to clone.
+ * @param {boolean} [isDeep] Specify a deep clone.
+ * @returns {Object} Returns the initialized clone.
+ */
+function initCloneByTag(object, tag, isDeep) {
+  var Ctor = object.constructor;
+  switch (tag) {
+    case arrayBufferTag:
+      return cloneBuffer(object);
+
+    case boolTag:
+    case dateTag:
+      return new Ctor(+object);
+
+    case float32Tag: case float64Tag:
+    case int8Tag: case int16Tag: case int32Tag:
+    case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:
+      return cloneTypedArray(object, isDeep);
+
+    case mapTag:
+      return cloneMap(object);
+
+    case numberTag:
+    case stringTag:
+      return new Ctor(object);
+
+    case regexpTag:
+      return cloneRegExp(object);
+
+    case setTag:
+      return cloneSet(object);
+
+    case symbolTag:
+      return cloneSymbol(object);
+  }
+}
+
+module.exports = initCloneByTag;