Object Static Methods

JavaScript · Methods reference

JavaScript · Methods reference

📋 Overview

Object static methods for keys, assign, create, and property descriptors.

🔧 Methods

Object static methods

Method	Description
`Object.assign(target, ...sources)`	Copy enumerable own props to target
`Object.create(proto, descriptors?)`	New object with prototype
`Object.defineProperty` / `defineProperties`	Define descriptors
`Object.entries(obj)` / `values` / `keys`	Enumerable own props
`Object.fromEntries(iterable)`	Build object from [k,v] pairs
`Object.getOwnPropertyDescriptor(s)`	Read property metadata
`Object.getOwnPropertyNames` / `getOwnPropertySymbols`	Own keys/symbols
`Object.getPrototypeOf` / `setPrototypeOf`	Prototype chain
`Object.is(value1, value2)`	SameValue equality (NaN, -0)
`Object.freeze` / `seal` / `preventExtensions`	Immutability levels
`Object.isFrozen` / `isSealed` / `isExtensible`	Test immutability
`Object.hasOwn(obj, prop)`	Own property check (ES2022)
`Object.groupBy(items, fn)`	Group iterable to object (ES2024)

💡 Examples

See parent topic notes for runnable snippets; this page is the complete method index.

⚠️ Pitfalls

Mutating methods return None in Python — do not chain sort() / reverse() expecting a new list.
Default JS sort() compares strings — pass (a,b) => a-b for numbers.
SQL function names differ by dialect — verify Postgres vs MySQL docs.
Django QuerySet.update() skips save() signals and auto auto_now fields on models.

Objects

Map & Set Methods

JavaScript · Methods reference

Promise Methods

JavaScript · Methods reference

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📋 Overview 🔧 Methods Object static methods 💡 Examples ⚠️ Pitfalls 🔗 Related