2 // https://github.com/tc39/proposal-iterator-helpers
3 var aFunction = require('../internals/a-function');
4 var anObject = require('../internals/an-object');
5 var getBuiltIn = require('../internals/get-built-in');
7 var Promise = getBuiltIn('Promise');
10 var createMethod = function (TYPE) {
11 var IS_TO_ARRAY = TYPE == 0;
12 var IS_FOR_EACH = TYPE == 1;
13 var IS_EVERY = TYPE == 2;
14 var IS_SOME = TYPE == 3;
15 return function (iterator, fn) {
17 var next = aFunction(iterator.next);
18 var array = IS_TO_ARRAY ? [] : undefined;
19 if (!IS_TO_ARRAY) aFunction(fn);
21 return new Promise(function (resolve, reject) {
22 var closeIteration = function (method, argument) {
24 var returnMethod = iterator['return'];
25 if (returnMethod !== undefined) {
26 return Promise.resolve(returnMethod.call(iterator)).then(function () {
33 return reject(error2);
37 var onError = function (error) {
38 closeIteration(reject, error);
41 var loop = function () {
43 Promise.resolve(anObject(next.call(iterator))).then(function (step) {
45 if (anObject(step).done) {
46 resolve(IS_TO_ARRAY ? array : IS_SOME ? false : IS_EVERY || undefined);
48 var value = step.value;
50 push.call(array, value);
53 Promise.resolve(fn(value)).then(function (result) {
56 } else if (IS_EVERY) {
57 result ? loop() : closeIteration(resolve, false);
59 result ? closeIteration(resolve, IS_SOME || value) : loop();
64 } catch (error) { onError(error); }
66 } catch (error2) { onError(error2); }
75 toArray: createMethod(0),
76 forEach: createMethod(1),
77 every: createMethod(2),
78 some: createMethod(3),