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Test262/ Standard Built-in Objects/ Object/ Object.preventExtensions
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Show pattern for JavaScript engine result barsChakraCoreJavaScriptCoreSpiderMonkeyV8Moddable XSQuickJSengine262
Current folder:Object.preventExtensions78 tests
preventExtensions
(source)
99%
ChakraCore: 97%JavaScriptCore: 100%SpiderMonkey: 100%V8: 100%Moddable XS: 99%QuickJS: 100%engine262: 100%
File:		Object.preventExtensions must exist as a function
SD
15.2.3.10-0-1.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Object.preventExtensions must exist as a function taking 1 parameter
SD
15.2.3.10-0-2.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Object.preventExtensions does not throw TypeError if 'O' is undefined
SD
15.2.3.10-1-1.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Object.preventExtensions does not throw TypeError if 'O' is null
SD
15.2.3.10-1-2.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Object.preventExtensions does not throw TypeError if 'O' is a boolean primitive value
SD
15.2.3.10-1-3.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Object.preventExtensions does not throw TypeError if 'O' is a string primitive value
SD
15.2.3.10-1-4.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Object.preventExtensions does not throw TypeError if type of first param is not Object
SD
15.2.3.10-1.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Repeated calls to preventExtensions have no side effects
SD
15.2.3.10-2-1.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Object.preventExtensions returns its arguments after setting its extensible property to false
SD
15.2.3.10-2.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Object.isExtensible(arg) returns false if arg is the returned object
SD
15.2.3.10-3-1.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Indexed properties cannot be added into an Error object
SD
15.2.3.10-3-10.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Indexed properties cannot be added into an Arguments object
SD
15.2.3.10-3-11.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Named properties cannot be added into the returned object
SD
15.2.3.10-3-12.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Named properties cannot be added into a Function object
SD
15.2.3.10-3-13.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Named properties cannot be added into an Array object
SD
15.2.3.10-3-14.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Named properties cannot be added into a String object
SD
15.2.3.10-3-15.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Named properties cannot be added into a Boolean object
SD
15.2.3.10-3-16.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Named properties cannot be added into a Number object
SD
15.2.3.10-3-17.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Named properties cannot be added into a Date object
SD
15.2.3.10-3-18.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Named properties cannot be added into a RegExp object
SD
15.2.3.10-3-19.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Indexed properties cannot be added into the returned object
SD
15.2.3.10-3-2.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Named properties cannot be added into an Error object
SD
15.2.3.10-3-20.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Named properties cannot be added into an Arguments object
SD
15.2.3.10-3-21.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Properties can still be deleted after extensions have been prevented
SD
15.2.3.10-3-22.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Properties can still be reassigned after extensions have been prevented
SD
15.2.3.10-3-23.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		[[Extensible]]: false on a prototype doesn't prevent adding properties to an instance that inherits from that prototype
SD
15.2.3.10-3-24.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Indexed properties cannot be added into a Function object
SD
15.2.3.10-3-3.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Indexed properties cannot be added into an Array object
SD
15.2.3.10-3-4.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Indexed properties cannot be added into a String object
SD
15.2.3.10-3-5-1.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Indexed properties cannot be added into a String object
SD
15.2.3.10-3-5.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Indexed properties cannot be added into a Boolean object
SD
15.2.3.10-3-6.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Indexed properties cannot be added into a Number object
SD
15.2.3.10-3-7.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Indexed properties cannot be added into a Date object
SD
15.2.3.10-3-8.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		Indexed properties cannot be added into a RegExp object
SD
15.2.3.10-3-9.js
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		abrupt-completion.js
SD
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		name.js
SD
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		not-a-constructor.js
SD
ChakraCore: 2 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2
File:		symbol-object-contains-symbol-properties-non-strict.js
D
ChakraCore: 1 of 1JavaScriptCore: 1 of 1SpiderMonkey: 1 of 1V8: 1 of 1Moddable XS: 1 of 1QuickJS: 1 of 1engine262: 1 of 1
File:		symbol-object-contains-symbol-properties-strict.js
S
ChakraCore: 1 of 1JavaScriptCore: 1 of 1SpiderMonkey: 1 of 1V8: 1 of 1Moddable XS: 0 of 1QuickJS: 1 of 1engine262: 1 of 1
File:		throws-when-false.js
SD
ChakraCore: 0 of 2JavaScriptCore: 2 of 2SpiderMonkey: 2 of 2V8: 2 of 2Moddable XS: 2 of 2QuickJS: 2 of 2engine262: 2 of 2