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37 lines
1.4 KiB
37 lines
1.4 KiB
2 years ago
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'use strict';
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var $ = require('../internals/export');
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var getBuiltIn = require('../internals/get-built-in');
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var call = require('../internals/function-call');
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var anObject = require('../internals/an-object');
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var isConstructor = require('../internals/is-constructor');
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var getIterator = require('../internals/get-iterator');
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var getMethod = require('../internals/get-method');
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var iterate = require('../internals/iterate');
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var wellKnownSymbol = require('../internals/well-known-symbol');
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var OBSERVABLE_FORCED = require('../internals/observable-forced');
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var $$OBSERVABLE = wellKnownSymbol('observable');
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// `Observable.from` method
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// https://github.com/tc39/proposal-observable
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$({ target: 'Observable', stat: true, forced: OBSERVABLE_FORCED }, {
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from: function from(x) {
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var C = isConstructor(this) ? this : getBuiltIn('Observable');
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var observableMethod = getMethod(anObject(x), $$OBSERVABLE);
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if (observableMethod) {
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var observable = anObject(call(observableMethod, x));
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return observable.constructor === C ? observable : new C(function (observer) {
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return observable.subscribe(observer);
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});
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}
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var iterator = getIterator(x);
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return new C(function (observer) {
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iterate(iterator, function (it, stop) {
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observer.next(it);
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if (observer.closed) return stop();
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}, { IS_ITERATOR: true, INTERRUPTED: true });
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observer.complete();
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});
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}
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});
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