HTML CSS and JavaScript for Beginners - A Web Design Course - ES6 JavaScript

The video tutorial covers variable declaration in JavaScript using let, const, and var. It explains the differences between function scope and global scope, and how let and const introduce block scope. The tutorial also compares the use of let and var in loops, highlighting the benefits of using let for block-scoped variables. Finally, it discusses the immutability of const variables and best practices for using let and const over var.

What is the scope of a variable declared with 'var' inside a function?

• Global scope

• Function scope

• Block scope

• Module scope

Which of the following is true about 'let' in JavaScript?

• 'let' variables are globally scoped

• 'let' variables are function scoped

• 'let' variables are block scoped

• 'let' variables are module scoped

What happens to a 'let' variable declared inside a loop after the loop ends?

• It is undefined outside the loop

• It retains its value outside the loop

• It becomes a global variable

• It throws an error

What is a key difference between 'let' and 'const'?

• 'let' is globally scoped

• 'const' does not allow reassignment

• 'let' is block scoped, 'const' is not

• 'const' allows reassignment

Why is it recommended to use 'let' and 'const' over 'var'?

• They are more widely supported

• They offer more predictable scoping

• They provide better performance

• They are easier to type