Frontend Web Development Bootcamp - Build a Twitter Clone - Variables in JavaScript

The video tutorial covers the basics of variables in JavaScript, including how to declare them using VAR, LET, and CONST. It explains the differences between these keywords and provides guidance on naming conventions for variables. The tutorial also highlights the importance of understanding variable types and how JavaScript handles them.

What are the three keywords used to declare variables in JavaScript?

• define, set, const

• int, char, float

• var, let, const

• declare, assign, const

Which keyword was originally used in JavaScript for variable declaration?

• define

• const

• let

• var

What is the output when a variable declared with 'var' is logged to the console before it is assigned a value?

• undefined

• null

• 0

• NaN

Which naming convention is most commonly used for JavaScript variables?

• snake_case

• PascalCase

• camelCase

• kebab-case

Which of the following is NOT allowed in JavaScript variable names?

• Using dollar signs

• Using underscores

• Starting with a number

• Starting with a letter

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

• The value changes

• The value becomes null

• The value becomes undefined

• An error occurs

Which keyword should be used if you want to declare a variable whose value will not change?

• define

• var

• let

• const