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30 lines
947 B
JavaScript
30 lines
947 B
JavaScript
// Copyright (C) 2016 the V8 project authors. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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es6id: 25.2.1
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description: Subclassing GeneratorFunction
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info: |
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25.2.1 The GeneratorFunction Constructor
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...
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GeneratorFunction is designed to be subclassable. It may be used as the value
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of an extends clause of a class definition. Subclass constructors that intend
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to inherit the specified GeneratorFunction behaviour must include a super call
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to the GeneratorFunction constructor to create and initialize subclass
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instances with the internal slots necessary for built-in GeneratorFunction
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behaviour.
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...
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---*/
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var GeneratorFunction = Object.getPrototypeOf(function* () {}).constructor;
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class Gfn extends GeneratorFunction {}
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var gfn = new Gfn('a', 'yield a; yield a * 2;');
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var iter = gfn(42);
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assert.sameValue(iter.next().value, 42);
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assert.sameValue(iter.next().value, 84);
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