JavaScript Variables Quiz

Show Me What You Got! How do you declare a variable in JavaScript?

• let

• function

• var

• variable

Show Me What You Got! What are the different types of values that a variable in JavaScript can represent?

• apple, banana, orange, grape

• cat, dog, bird, fish

• red, blue, green, yellow

• string, number, boolean, object, function, undefined

Show Me What You Got! Is JavaScript attentive to the way we dress up variable names, paying attention to uppercase and lowercase letters?

• No

• Yes

• Sometimes

• Only on weekends

Show Me What You Got! You're creating a new variable in JavaScript for your intergalactic DJ app. What rules must you follow for naming it?

• Variable names must begin with a letter, underscore (_), or dollar sign ($)

• Variable names must begin with a special character

• Variable names must begin with a number

• Variable names must begin with a hyphen

Show Me What You Got! Imagine you're a developer working on a JavaScript project. You declare a variable but forget to assign it any value. What does JavaScript default this variable to?

• undefined

• false

• 0

• null

Show Me What You Got! Explain the difference between 'let', 'var', and 'const' in JavaScript variable declaration.

• They are all used for declaring global variables only

• They have different scopes and usage in JavaScript.

• They are all the same and can be used interchangeably

• They are all outdated and not recommended for modern JavaScript development

Show Me What You Got! Can a variable name in JavaScript be initiated with a digit?

• Yes

• Maybe

• Only on Tuesdays

• No

Show Me What You Got! Why do we use camelCase or snake_case when naming variables in JavaScript?

• To add unnecessary complexity to the code

• To make variable names more readable and understandable.

• To make the code run faster

• To confuse other programmers

Show Me What You Got! Imagine you're coding a new feature in JavaScript and you declare a variable using 'let' inside a for-loop. What's the scope of this variable?

• Global scope

• Function scope

• Class scope

• Block scope

Which of the following answer choices is NOT an example of a variable?

• 8
• x
• u
• n