Script/Reference/Global_Objects/Object/__lookupSetter__) Deprecated 
    5. [ ` Object.assign() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/assign)
    6. [ ` Object.create() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/create)
    7. [ ` Object.defineProperties() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperties)
    8. [ ` Object.defineProperty() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty)
    9. [ ` Object.entries() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/entries)
    10. [ ` Object.freeze() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/freeze)
    11. [ ` Object.fromEntries() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/fromEntries)
    12. [ ` Object.getOwnPropertyDescriptor() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptor)
    13. [ ` Object.getOwnPropertyDescriptors() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyDescriptors)
    14. [ ` Object.getOwnPropertyNames() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertyNames)
    15. [ ` Object.getOwnPropertySymbols() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getOwnPropertySymbols)
    16. [ ` Object.getPrototypeOf() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/getPrototypeOf)
    17. [ ` Object.groupBy() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/groupBy)
    18. [ ` Object.hasOwn() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwn)
    19. [ ` Object.prototype.hasOwnProperty() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/hasOwnProperty)
    20. [ ` Object.is() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/is)
    21. [ ` Object.isExtensible() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isExtensible)
    22. [ ` Object.isFrozen() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isFrozen)
    23. [ ` Object.prototype.isPrototypeOf() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isPrototypeOf)
    24. [ ` Object.isSealed() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/isSealed)
    25. [ ` Object.keys() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys)
    26. [ ` Object.preventExtensions() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/preventExtensions)
    27. [ ` Object.prototype.propertyIsEnumerable() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/propertyIsEnumerable)
    28. [ ` Object.seal() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/seal)
    29. [ ` Object.setPrototypeOf() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/setPrototypeOf)
    30. [ ` Object.prototype.toLocaleString() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toLocaleString)
    31. [ ` Object.prototype.toString() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toString)
    32. [ ` Object.prototype.valueOf() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/valueOf)
    33. [ ` Object.values() ` ](/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/values)

##  In this article

  * Syntax 
  * Description 
  * Examples 
  * Specifications 
  * Browser compatibility 
  * See also 

#  Object.prototype.__defineSetter__()

**Deprecated:** This feature is no longer recommended. Though some browsers
might still support it, it may have already been removed from the relevant web
standards, may be in the process of being dropped, or may only be kept for
compatibility purposes. Avoid using it, and update existing code if possible;
see the  compatibility table  at the bottom of this page to guide your
decision. Be aware that this feature may cease to work at any time.

**Note:** This feature is deprecated in favor of defining [ setters ](/e