Question

The purpose of extensible attribute is to __________

(a) make all of the own properties of that object non configurable

(b) to configure and bring a writable property

(c) “lock down” objects into a known state and prevent outside tampering

(d) to include new properties into the object

I got this question during an interview.

Asked question is from Object Attributes and Serialization topic in section Lexical Structures of JavaScript

Answer 1

Right choice is (c) “lock down” objects into a known state and prevent outside tampering

Easiest explanation: Extensible attributes determines whether the object can have new properties or not. Therefore extensible attribute will allow an object to include and write properties into them.