Learn JavaScript from Scratch JavaScript for Everyone - Strict Mode

The video tutorial explains the importance of using 'strict mode' in JavaScript to prevent common coding errors. It demonstrates how to enable strict mode in scripts and functions, and shows how it helps catch errors like undeclared variables and typos. The tutorial emphasizes the benefits of strict mode, such as improved code quality and reduced bugs, and encourages its use for better coding practices.

What is the primary purpose of using strict mode in JavaScript?

• To prevent certain types of errors

• To allow the use of new JavaScript features

• To make the code run faster

• To make the code compatible with older browsers

How can you enable strict mode in a JavaScript file?

• By including 'use strict' as a comment

• By placing 'use strict' at the top of the script

• By using the keyword 'strict' at the end of the file

• By using a special HTML tag

What happens when you try to assign a value to an undeclared variable in strict mode?

• The script stops executing

• The value is assigned without any issues

• An error is thrown

• The variable is automatically declared

Why is it beneficial to use strict mode when writing JavaScript code?

• It makes the code run on all browsers

• It automatically fixes syntax errors

• It helps prevent memory leaks and typos

• It allows for more flexible coding practices

What is a common mistake that strict mode helps to catch?

• Forgetting to declare variables

• Using deprecated JavaScript features

• Writing inefficient code

• Using too many comments