The Tor Browser / file revision

 /* This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 /* ES6 20121122 draft 15.14.4.4. */

 function MapForEach(callbackfn, thisArg = undefined) {

     /* Step 1-2. */

     var M = this;

     if (!IsObject(M))

         ThrowError(JSMSG_BAD_TYPE, typeof M);

     /* Step 3-4. */

     try {

         callFunction(std_Map_has, M);

     } catch (e) {

         ThrowError(JSMSG_BAD_TYPE, typeof M);

     }

     /* Step 5. */

     if (!IsCallable(callbackfn))

         ThrowError(JSMSG_NOT_FUNCTION, DecompileArg(0, callbackfn));

     /* Step 6-8. */

     var entries = callFunction(std_Map_iterator, M);

     while (true) {

         var result = callFunction(std_Map_iterator_next, entries);

         if (result.done)

             break;

         var entry = result.value;

         callFunction(callbackfn, thisArg, entry[1], entry[0], M);

     }

 }