Modern Web Design with HTML5, CSS3, and JavaScript - JavaScript – Let and Const Variables

The video tutorial introduces the concept of variables in JavaScript, focusing on the use of 'var', 'let', and 'constant'. It explains the immutability of constants and how they differ from 'var' and 'let', which allow reassignment. The tutorial also covers the scope of variables, emphasizing block-level scope and the use of curly brackets. Practical examples are provided to illustrate these concepts, encouraging viewers to experiment with variable declarations and understand their behavior in different scopes.

What is the main characteristic of a 'const' variable in JavaScript?

• It can be reassigned.

• It is immutable.

• It is globally scoped.

• It does not require an initializer.

Which keyword allows variable reassignment in JavaScript?

• let

• final

• static

• const

What is the scope of a 'var' declaration in JavaScript?

• Locally scoped

• Block scoped

• Function scoped

• Globally scoped

How does 'let' differ from 'var' in terms of scope?

• 'let' is globally scoped.

• 'let' is not scoped.

• 'let' is block scoped.

• 'let' is function scoped.

What happens if you try to reassign a 'const' variable?

• It will throw an error.

• It will be ignored.

• It will be reassigned successfully.

• It will create a new variable.

Why is an initializer required for 'const' variables?

• Because they are mutable.

• Because they are immutable.

• Because they are block scoped.

• Because they are globally scoped.

Which keyword should you use if you want a variable to be block scoped and allow reassignment?

• const

• let

• var

• static