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__proto__.js
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__proto__.js
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function testCode() {
// __proto__ in object literals - basic support
if (!({ __proto__: [] } instanceof Array) || { __proto__: null } instanceof Object) {
return false;
}
// __proto__ in object literals - multiple __proto__ is an error
try {
eval('({ __proto__ : [], __proto__: {} })');
return false;
} catch (e) {}
// __proto__ in object literals - not a computed property
var a = '__proto__';
if ({ [a]: [] } instanceof Array) {
return false;
}
// __proto__ in object literals - not a shorthand method
if ({ __proto__() {} } instanceof Function) {
return false;
}
// __proto__ in object literals - not a shorthand property
var __proto__ = [];
if ({ __proto__ } instanceof Array) {
return false;
}
// Object.prototype.__proto__ - get prototype
var A = function () {};
if (new A().__proto__ !== A.prototype) {
return false;
}
// Object.prototype.__proto__ - set prototype
var o = {};
o.__proto__ = Array.prototype;
if (!(o instanceof Array)) {
return false;
}
// Object.prototype.__proto__ - absent from Object.create(null)
var o2 = Object.create(null),
p = {};
o2.__proto__ = p;
if (Object.getPrototypeOf(o2) === p) {
return false;
}
// Object.prototype.__proto__ - correct property descriptor
var desc = Object.getOwnPropertyDescriptor(Object.prototype, '__proto__');
if (!(desc && 'get' in desc && 'set' in desc && desc.configurable && !desc.enumerable)) {
return false;
}
// Object.prototype.__proto__ - present in hasOwnProperty()
if (!Object.prototype.hasOwnProperty('__proto__')) {
return false;
}
// Object.prototype.__proto__ - present in Object.getOwnPropertyNames()
if (Object.getOwnPropertyNames(Object.prototype).indexOf('__proto__') === -1) {
return false;
}
return true;
}
try {
if (testCode()) {
console.log('kangax-es6/annex-b.__proto__.js: OK');
} else {
console.log('kangax-es6/annex-b.__proto__.js: failed');
}
} catch (e) {
console.log('kangax-es6/annex-b.__proto__.js: exception: ' + e);
}

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__proto__.js (2 KB)

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