--- /dev/null
+'use strict';
+// https://github.com/tc39/proposal-iterator-helpers
+var $ = require('../internals/export');
+var iterate = require('../internals/iterate');
+var aFunction = require('../internals/a-function');
+var anObject = require('../internals/an-object');
+
+$({ target: 'Iterator', proto: true, real: true }, {
+ every: function every(fn) {
+ anObject(this);
+ aFunction(fn);
+ return !iterate(this, function (value) {
+ if (!fn(value)) return iterate.stop();
+ }, undefined, false, true).stopped;
+ }
+});