--- /dev/null
+'use strict';
+var $ = require('../internals/export');
+var $reduce = require('../internals/array-reduce').left;
+var arrayMethodIsStrict = require('../internals/array-method-is-strict');
+var arrayMethodUsesToLength = require('../internals/array-method-uses-to-length');
+
+var STRICT_METHOD = arrayMethodIsStrict('reduce');
+var USES_TO_LENGTH = arrayMethodUsesToLength('reduce', { 1: 0 });
+
+// `Array.prototype.reduce` method
+// https://tc39.github.io/ecma262/#sec-array.prototype.reduce
+$({ target: 'Array', proto: true, forced: !STRICT_METHOD || !USES_TO_LENGTH }, {
+ reduce: function reduce(callbackfn /* , initialValue */) {
+ return $reduce(this, callbackfn, arguments.length, arguments.length > 1 ? arguments[1] : undefined);
+ }
+});