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