Object.assign() - JavaScript | MDN

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Object.getOwnPropertyDescriptor()

Properties in the target object are overwritten by properties in the sources if they have the same key. Later sources' properties overwrite earlier ones.

Object.defineProperty()

Properties in the target object are overwritten by properties in the sources if they have the same key. Later sources' properties overwrite earlier ones.

Warning for deep clone

For deep cloning, we need to use alternatives like structuredClone(), because Object.assign() copies property values.

Warning for deep clone

For deep cloning, we need to use alternatives like structuredClone(), because Object.assign() copies property values.

Object.defineProperties()

Enumerability and ownership of properties

Spread in object literals

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This page was last modified on Jul 10, 2025 by MDN contributors.

getOwnPropertyDescriptors()

getOwnPropertyNames()

getOwnPropertySymbols()

preventExtensions()

__defineGetter__()

__defineSetter__()

__lookupGetter__()

__lookupSetter__()