Full Stack Web Development MASTERY Course - Novice to Expert - Var, Const, Let in JavaScript

The video tutorial covers the basics of variables in JavaScript, including how to create and use them. It explains the differences between var, let, and const, and provides rules for naming variables. The tutorial also discusses different case types for variable names and demonstrates how to work with arrays using const.

What is the primary purpose of a variable in JavaScript?

• To execute functions

• To store values in memory

• To define classes

• To create loops

Which keyword is used to declare a variable that can be reassigned in JavaScript?

• const

• var

• let

• function

What will happen if you try to declare a variable name starting with a number in JavaScript?

• It will work without any issues

• It will throw a syntax error

• It will automatically convert the number to a string

• It will ignore the number

Which of the following is a valid variable name in JavaScript?

• variable-1

• _variable

• 1variable

• variable name

What is the camelCase naming convention?

• Capitalizing the first letter of each word except the first

• Capitalizing the first letter of each word

• Using hyphens between words

• Using underscores between words

Which naming convention uses hyphens between words?

• camelCase

• snake_case

• kebab-case

• PascalCase

What is a key characteristic of a variable declared with const?

• It is block-scoped

• It is function-scoped

• It cannot be redeclared

• It can be reassigned

What happens if you try to reassign a const variable?

• It will overwrite the value

• It will create a new variable

• It will silently fail

• It will throw an error

Which keyword is recommended for declaring variables that should not be changed?

• var

• let

• const

• function

How can you add a new element to an array declared with const?

• You cannot add elements to a const array

• Use the add method

• Use the push method

• Reassign the array