What is the purpose of use strict in JavaScript and why is it used

Question

I was stuck on a question during my JS interview. Can you tell me What is the purpose of "use strict" in JavaScript and why is it used?

Answer 1

It is used to enable strict mode, which enforces a stricter set of rules for writing JavaScript code.

Purpose of "use strict":

Prevents accidental errors - It throws errors for common coding mistakes, such as assigning values to undeclared variables.

Improves performance - Some optimizations are enabled under strict mode since the code behaves in a predictable manner.

Disallows unsafe actions - It forbids certain features that are prone to errors, like using with statements.

Simplifies debugging - Errors are detected earlier, reducing debugging time.

Promotes future-proof code - It helps prepare codebases for future JavaScript versions by enforcing stricter standards.

Why is it used?

To avoid subtle bugs that are hard to detect in non-strict mode.

To enforce a cleaner and more secure coding standard.

To make the code easier to understand and maintain.