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36 lines
1.4 KiB
36 lines
1.4 KiB
'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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