StdLib Object

Object

The Object built-in provides methods for creating and manipulating JavaScript objects.

Implementation Status: 100% Complete

Overview

Category	Methods	Implemented
Static Methods	23	23
Prototype Methods	10	10
Total	33	33

Static Methods (Object.xxx)

Method	Status	Description
Object.keys(obj)	Implemented	Returns array of own enumerable property names
Object.values(obj)	Implemented	Returns array of own enumerable property values
Object.entries(obj)	Implemented	Returns array of [key, value] pairs
Object.assign(target, ...sources)	Implemented	Copies enumerable properties from sources to target
Object.fromEntries(iterable)	Implemented	Creates object from [key, value] iterable
Object.hasOwn(obj, prop)	Implemented	Checks if object has own property (ES2022)
Object.freeze(obj)	Implemented	Freezes an object
Object.seal(obj)	Implemented	Seals an object
Object.isFrozen(obj)	Implemented	Checks if object is frozen
Object.isSealed(obj)	Implemented	Checks if object is sealed
Object.is(value1, value2)	Implemented	SameValue comparison
Object.create(proto, props)	Implemented	Creates object with specified prototype
Object.getOwnPropertyNames(obj)	Implemented	Returns array of own property names (strings)
Object.getOwnPropertyDescriptor(obj, prop)	Implemented	Returns property descriptor
Object.getOwnPropertyDescriptors(obj)	Implemented	Returns all own property descriptors
Object.getPrototypeOf(obj)	Implemented	Returns prototype of object
Object.defineProperty(obj, prop, desc)	Implemented	Defines a property
Object.defineProperties(obj, props)	Implemented	Defines multiple properties
Object.setPrototypeOf(obj, proto)	Implemented	Sets prototype of object
Object.preventExtensions(obj)	Implemented	Prevents new properties
Object.isExtensible(obj)	Implemented	Checks if object is extensible
Object.getOwnPropertySymbols(obj)	Implemented	Returns array of own symbol properties
Object.groupBy(items, callback)	Implemented	Groups iterable elements by key (ES2024)

Prototype Methods (obj.xxx)

Method	Status	Description
toString()	Implemented	Returns "[object Tag]", respects Symbol.toStringTag
valueOf()	Implemented	Returns the object itself
hasOwnProperty(prop)	Implemented	Checks if property is own property
propertyIsEnumerable(prop)	Implemented	Checks if property is enumerable
toLocaleString()	Implemented	Delegates to toString()
isPrototypeOf(obj)	Implemented	Checks if in prototype chain
__lookupGetter__(prop)	Implemented	Legacy: looks up getter in prototype chain
__lookupSetter__(prop)	Implemented	Legacy: looks up setter in prototype chain
__proto__ (getter)	Implemented	Gets prototype
__proto__ (setter)	Implemented	Sets prototype

Files

File	Purpose
StdLib/Object/ObjectConstructor.cs	Static methods
StdLib/Object/ObjectPrototype.cs	Prototype methods
StdLib/Object/ObjectHelper.cs	Internal helpers

See Also

• Standard-Library-Architecture - How prototypes are implemented
• JsObject-and-Properties - Internal object representation