HTML CSS and JavaScript for Beginners - A Web Design Course - JavaScript Variables in Action

The video tutorial covers JavaScript variables, including how to declare and name them, rules for naming, and the use of reserved words. It explains variable assignment, the use of the equals operator, and the importance of order in assignments. The tutorial also explores different data types in JavaScript, such as strings, numbers, and booleans, and how to work with them dynamically.

What characters can be used in JavaScript variable names?

• Only letters and numbers

• Letters, numbers, underscores, and dollar signs

• Only letters and underscores

• Letters, numbers, and spaces

Why can't JavaScript variable names start with a number?

• It will be treated as a string

• It will be ignored by the compiler

• It will be treated as a number

• It will cause a syntax error

What is the result of assigning a new value to a variable in JavaScript?

• The variable is updated with the new value

• The variable becomes undefined

• The variable retains its original value

• The variable is deleted

Which operator is used to assign a value to a variable in JavaScript?

• +

• =

• ==

• =>

What is a dynamic data type in JavaScript?

• A data type that cannot change

• A data type that can change

• A data type that is always a string

• A data type that is always a number

How can you include double quotes inside a string that is enclosed in double quotes?

• Use single quotes instead

• Use a backslash before the double quotes

• Use curly braces

• Use triple quotes

Which of the following is a boolean value in JavaScript?

• "false"

• 10

• false

• "true"