mirror of https://github.com/tc39/test262.git
68 lines
1.9 KiB
JavaScript
68 lines
1.9 KiB
JavaScript
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// 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: 14.1.6
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description: >
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Default parameters' effect on function length
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info: |
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Function length is counted by the non initialized parameters in the left.
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9.2.4 FunctionInitialize (F, kind, ParameterList, Body, Scope)
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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", PropertyDescriptor{[[Value]]:
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len, [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: true}).
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[...]
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FormalsList : FormalParameter
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1. If HasInitializer of FormalParameter is true return 0
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2. Return 1.
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FormalsList : FormalsList , FormalParameter
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1. Let count be the ExpectedArgumentCount of FormalsList.
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2. If HasInitializer of FormalsList is true or HasInitializer of
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FormalParameter is true, return count.
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3. Return count+1.
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features: [default-parameters]
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includes: [propertyHelper.js]
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---*/
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class C1 { m(x = 42) {} }
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var m1 = C1.prototype.m;
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assert.sameValue(m1.length, 0, 'formalslist: x = 42');
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verifyNotEnumerable(m1, 'length');
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verifyNotWritable(m1, 'length');
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verifyConfigurable(m1, 'length');
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class C2 { m(x = 42, y) {} }
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var m2 = C2.prototype.m;
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assert.sameValue(m2.length, 0, 'formalslist: x = 42, y');
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verifyNotEnumerable(m2, 'length');
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verifyNotWritable(m2, 'length');
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verifyConfigurable(m2, 'length');
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class C3 { m(x, y = 42) {} }
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var m3 = C3.prototype.m;
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assert.sameValue(m3.length, 1, 'formalslist: x, y = 42');
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verifyNotEnumerable(m3, 'length');
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verifyNotWritable(m3, 'length');
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verifyConfigurable(m3, 'length');
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class C4 { m(x, y = 42, z) {} }
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var m4 = C4.prototype.m;
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assert.sameValue(m4.length, 1, 'formalslist: x, y = 42, z');
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verifyNotEnumerable(m4, 'length');
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verifyNotWritable(m4, 'length');
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verifyConfigurable(m4, 'length');
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