123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051 |
- 'use strict';
- var bind = require('../internals/function-bind-context');
- var uncurryThis = require('../internals/function-uncurry-this');
- var toObject = require('../internals/to-object');
- var isConstructor = require('../internals/is-constructor');
- var getAsyncIterator = require('../internals/get-async-iterator');
- var getIterator = require('../internals/get-iterator');
- var getIteratorDirect = require('../internals/get-iterator-direct');
- var getIteratorMethod = require('../internals/get-iterator-method');
- var getMethod = require('../internals/get-method');
- var getBuiltIn = require('../internals/get-built-in');
- var getBuiltInPrototypeMethod = require('../internals/get-built-in-prototype-method');
- var wellKnownSymbol = require('../internals/well-known-symbol');
- var AsyncFromSyncIterator = require('../internals/async-from-sync-iterator');
- var toArray = require('../internals/async-iterator-iteration').toArray;
-
- var ASYNC_ITERATOR = wellKnownSymbol('asyncIterator');
- var arrayIterator = uncurryThis(getBuiltInPrototypeMethod('Array', 'values'));
- var arrayIteratorNext = uncurryThis(arrayIterator([]).next);
-
- var safeArrayIterator = function () {
- return new SafeArrayIterator(this);
- };
-
- var SafeArrayIterator = function (O) {
- this.iterator = arrayIterator(O);
- };
-
- SafeArrayIterator.prototype.next = function () {
- return arrayIteratorNext(this.iterator);
- };
-
- // `Array.fromAsync` method implementation
- // https://github.com/tc39/proposal-array-from-async
- module.exports = function fromAsync(asyncItems /* , mapfn = undefined, thisArg = undefined */) {
- var C = this;
- var argumentsLength = arguments.length;
- var mapfn = argumentsLength > 1 ? arguments[1] : undefined;
- var thisArg = argumentsLength > 2 ? arguments[2] : undefined;
- return new (getBuiltIn('Promise'))(function (resolve) {
- var O = toObject(asyncItems);
- if (mapfn !== undefined) mapfn = bind(mapfn, thisArg);
- var usingAsyncIterator = getMethod(O, ASYNC_ITERATOR);
- var usingSyncIterator = usingAsyncIterator ? undefined : getIteratorMethod(O) || safeArrayIterator;
- var A = isConstructor(C) ? new C() : [];
- var iterator = usingAsyncIterator
- ? getAsyncIterator(O, usingAsyncIterator)
- : new AsyncFromSyncIterator(getIteratorDirect(getIterator(O, usingSyncIterator)));
- resolve(toArray(iterator, mapfn, A));
- });
- };
|