learning$js

Object.preventExtensions()

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Term side of the Card
Topic: Object
Unit title: Object.preventExtensions()
Categories: Method
Explanation side of the Card

Explanation: The static method that prevents new properties from being added to an object. Once an object is made non-extensible, its shape cannot be altered by adding new properties, though existing properties can still be modified or deleted.

Browser compatibility:
  • The chrome browser supports this feature starting from version 6
  • The edge browser supports this feature starting from version 12
  • The firefox browser supports this feature starting from version 4
  • The safari browser supports this feature starting from version 5.1
Availability: