mirror of https://github.com/tc39/test262.git
68 lines
1.9 KiB
JavaScript
68 lines
1.9 KiB
JavaScript
// Copyright (C) 2016 the V8 project authors. All rights reserved.
|
|
// This code is governed by the BSD license found in the LICENSE file.
|
|
/*---
|
|
es6id: 14.1.6
|
|
description: >
|
|
Default parameters' effect on function length
|
|
info: |
|
|
Function length is counted by the non initialized parameters in the left.
|
|
|
|
9.2.4 FunctionInitialize (F, kind, ParameterList, Body, Scope)
|
|
|
|
[...]
|
|
2. Let len be the ExpectedArgumentCount of ParameterList.
|
|
3. Perform ! DefinePropertyOrThrow(F, "length", PropertyDescriptor{[[Value]]:
|
|
len, [[Writable]]: false, [[Enumerable]]: false, [[Configurable]]: true}).
|
|
[...]
|
|
|
|
FormalsList : FormalParameter
|
|
|
|
1. If HasInitializer of FormalParameter is true return 0
|
|
2. Return 1.
|
|
|
|
FormalsList : FormalsList , FormalParameter
|
|
|
|
1. Let count be the ExpectedArgumentCount of FormalsList.
|
|
2. If HasInitializer of FormalsList is true or HasInitializer of
|
|
FormalParameter is true, return count.
|
|
3. Return count+1.
|
|
features: [default-parameters]
|
|
includes: [propertyHelper.js]
|
|
---*/
|
|
|
|
class C1 { m(x = 42) {} }
|
|
|
|
var m1 = C1.prototype.m;
|
|
|
|
assert.sameValue(m1.length, 0, 'formalslist: x = 42');
|
|
verifyNotEnumerable(m1, 'length');
|
|
verifyNotWritable(m1, 'length');
|
|
verifyConfigurable(m1, 'length');
|
|
|
|
class C2 { m(x = 42, y) {} }
|
|
|
|
var m2 = C2.prototype.m;
|
|
|
|
assert.sameValue(m2.length, 0, 'formalslist: x = 42, y');
|
|
verifyNotEnumerable(m2, 'length');
|
|
verifyNotWritable(m2, 'length');
|
|
verifyConfigurable(m2, 'length');
|
|
|
|
class C3 { m(x, y = 42) {} }
|
|
|
|
var m3 = C3.prototype.m;
|
|
|
|
assert.sameValue(m3.length, 1, 'formalslist: x, y = 42');
|
|
verifyNotEnumerable(m3, 'length');
|
|
verifyNotWritable(m3, 'length');
|
|
verifyConfigurable(m3, 'length');
|
|
|
|
class C4 { m(x, y = 42, z) {} }
|
|
|
|
var m4 = C4.prototype.m;
|
|
|
|
assert.sameValue(m4.length, 1, 'formalslist: x, y = 42, z');
|
|
verifyNotEnumerable(m4, 'length');
|
|
verifyNotWritable(m4, 'length');
|
|
verifyConfigurable(m4, 'length');
|