instance-length.js (1326B)
1 // Copyright (C) 2016 the V8 project authors. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 /*--- 4 esid: sec-generatorfunction 5 description: Definition of instance `length` property 6 info: | 7 [...] 8 3. Return CreateDynamicFunction(C, NewTarget, "generator", args). 9 10 19.2.1.1.1 Runtime Semantics: CreateDynamicFunction 11 12 [...] 13 26. Perform FunctionInitialize(F, Normal, parameters, body, scope). 14 [...] 15 16 9.2.4 FunctionInitialize 17 18 [...] 19 3. Perform ! DefinePropertyOrThrow(F, "length", 20 PropertyDescriptor{[[Value]]: len, [[Writable]]: false, [[Enumerable]]: 21 false, [[Configurable]]: true}). 22 [...] 23 includes: [propertyHelper.js] 24 features: [generators] 25 ---*/ 26 27 var GeneratorFunction = Object.getPrototypeOf(function*() {}).constructor; 28 29 assert.sameValue(GeneratorFunction().length, 0); 30 assert.sameValue(GeneratorFunction('').length, 0); 31 assert.sameValue(GeneratorFunction('x').length, 0); 32 assert.sameValue(GeneratorFunction('x', '').length, 1); 33 assert.sameValue(GeneratorFunction('x', 'y', '').length, 2); 34 assert.sameValue(GeneratorFunction('x, y', '').length, 2); 35 36 verifyNotEnumerable(GeneratorFunction(), 'length'); 37 verifyNotWritable(GeneratorFunction(), 'length'); 38 verifyConfigurable(GeneratorFunction(), 'length'); 39 40 reportCompare(0, 0);