Medium JavaScript & TypeScript Multiple Choice

What does Object.freeze() do?

— Tests your understanding of this concept.

Answer Options

A Prevents new properties from being added

B Makes an object completely immutable (no add, delete, or modify)

C Freezes the garbage collector

D Locks the prototype chain

Get the answer with a detailed explanation, plus practice 20+ more JavaScript & TypeScript questions with adaptive quizzes and timed interviews.

This question is from the JavaScript & TypeScript topic (Programming Languages).

What will the following code log? ```js console.log(typeof null); ```

What is the output of: `console.log(0.1 + 0.2 === 0.3)`?

Which of the following creates a SHALLOW copy of an object?

What does the `in` operator check for in JavaScript?

In TypeScript, what does the `never` type represent?