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46 lines
1.5 KiB
JavaScript
46 lines
1.5 KiB
JavaScript
// Copyright (C) 2018 Valerie Young. 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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esid: sec-asyncgeneratorfunction
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description: Definition of instance `length` property
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info: |
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AsyncGeneratorFunction ( p1, p2, … , pn, body )
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...
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3. Return CreateDynamicFunction(C, NewTarget, "async generator", args).
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Runtime Semantics: CreateDynamicFunction
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...
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// the parameter "args" is sliced into "parameters" and "body"
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26. Perform FunctionInitialize(F, Normal, parameters, body, scope).
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...
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FunctionInitialize
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...
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2. Let len be the ExpectedArgumentCount of ParameterList.
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3. Perform ! DefinePropertyOrThrow(F, "length",
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PropertyDescriptor{[[Value]]: len, [[Writable]]: false, [[Enumerable]]:
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false, [[Configurable]]: true}).
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...
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includes: [propertyHelper.js]
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features: [async-iteration]
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---*/
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var AsyncGeneratorFunction = Object.getPrototypeOf(async function* () {}).constructor;
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var instance = AsyncGeneratorFunction()
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verifyProperty(AsyncGeneratorFunction(), "length", {
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value: 0,
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enumerable: false,
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writable: false,
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configurable: true,
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});
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assert.sameValue(AsyncGeneratorFunction('').length, 0, "test 1");
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assert.sameValue(AsyncGeneratorFunction('x').length, 0, "test 2");
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assert.sameValue(AsyncGeneratorFunction('x', '').length, 1, "test 3");
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assert.sameValue(AsyncGeneratorFunction('x', 'y', '').length, 2, "test 4");
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assert.sameValue(AsyncGeneratorFunction('x, y', '').length, 2, "test 5");
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