2 // https://github.com/tc39/proposal-iterator-helpers
3 // https://github.com/tc39/proposal-array-from-async
4 var global = require('../internals/global');
5 var call = require('../internals/function-call');
6 var aCallable = require('../internals/a-callable');
7 var anObject = require('../internals/an-object');
8 var getBuiltIn = require('../internals/get-built-in');
9 var getMethod = require('../internals/get-method');
11 var MAX_SAFE_INTEGER = 0x1FFFFFFFFFFFFF;
12 var TypeError = global.TypeError;
14 var createMethod = function (TYPE) {
15 var IS_TO_ARRAY = TYPE == 0;
16 var IS_FOR_EACH = TYPE == 1;
17 var IS_EVERY = TYPE == 2;
18 var IS_SOME = TYPE == 3;
19 return function (iterator, fn, target) {
21 var Promise = getBuiltIn('Promise');
22 var next = aCallable(iterator.next);
24 var MAPPING = fn !== undefined;
25 if (MAPPING || !IS_TO_ARRAY) aCallable(fn);
27 return new Promise(function (resolve, reject) {
28 var closeIteration = function (method, argument) {
30 var returnMethod = getMethod(iterator, 'return');
32 return Promise.resolve(call(returnMethod, iterator)).then(function () {
39 return reject(error2);
43 var onError = function (error) {
44 closeIteration(reject, error);
47 var loop = function () {
49 if (IS_TO_ARRAY && (index > MAX_SAFE_INTEGER) && MAPPING) {
50 throw TypeError('The allowed number of iterations has been exceeded');
52 Promise.resolve(anObject(call(next, iterator))).then(function (step) {
54 if (anObject(step).done) {
56 target.length = index;
58 } else resolve(IS_SOME ? false : IS_EVERY || undefined);
60 var value = step.value;
62 Promise.resolve(IS_TO_ARRAY ? fn(value, index) : fn(value)).then(function (result) {
65 } else if (IS_EVERY) {
66 result ? loop() : closeIteration(resolve, false);
67 } else if (IS_TO_ARRAY) {
68 target[index++] = result;
71 result ? closeIteration(resolve, IS_SOME || value) : loop();
75 target[index++] = value;
79 } catch (error) { onError(error); }
81 } catch (error2) { onError(error2); }
90 toArray: createMethod(0),
91 forEach: createMethod(1),
92 every: createMethod(2),
93 some: createMethod(3),