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