The Front-End Web Developer Bootcamp - HTML, CSS, JS, and React - Var in JavaScript

The video tutorial explains the three types of variables in JavaScript: var, let, and construction. It details how each type can be declared and assigned values, highlighting the differences in their behavior. The tutorial also introduces the concept of variable scopes, distinguishing between local and global variables. Practical examples in VS Code demonstrate how to use these variables effectively.

Which of the following is NOT a way to declare a variable in JavaScript?

• define

• var

• construction

• let

What happens when you declare a variable using 'var' and then reassign it?

• The original value is retained.

• The variable is deleted.

• The new value overwrites the original.

• An error is thrown.

How many times can you declare a variable using 'let'?

• It depends on the scope

• Once

• Multiple times

• Twice

Which variable type allows you to assign a value without declaration?

• let

• var

• construction

• None of the above

What is a key characteristic of the 'construction' variable type?

• It can be declared multiple times.

• It can be updated multiple times.

• It cannot be updated or redeclared.

• It allows dynamic typing.

What are the two scopes of JavaScript variables?

• Internal and External

• Local and Global

• Public and Private

• Static and Dynamic

In the practical example, what happens if you remove 'let' from a 'let' variable declaration?

• The code will not run.

• The variable will be treated as a 'var'.

• An error will be thrown.

• The variable will be treated as a 'construction'.