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 loop = function () {
24 Promise.resolve(anObject(next.call(iterator))).then(function (step) {
26 if (anObject(step).done) {
27 resolve(IS_TO_ARRAY ? array : IS_SOME ? false : IS_EVERY || undefined);
29 var value = step.value;
31 push.call(array, value);
34 Promise.resolve(fn(value)).then(function (result) {
37 } else if (IS_EVERY) {
38 result ? loop() : resolve(false);
40 result ? resolve(IS_SOME || value) : loop();
45 } catch (err) { reject(err); }
47 } catch (error) { reject(error); }
56 toArray: createMethod(0),
57 forEach: createMethod(1),
58 every: createMethod(2),
59 some: createMethod(3),