JavaScript Variables Flashcard

Front

How do you declare a variable in JavaScript?

Back

var

Front

What are the different types of values that a variable in JavaScript can represent?

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string, number, boolean, object, function, undefined

Front

Is JavaScript attentive to the way we dress up variable names, paying attention to uppercase and lowercase letters?

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Yes

Front

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?

Back

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

Front

What does JavaScript default a variable to if it is declared but not assigned any value?

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undefined

Front

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

Back

They have different scopes and usage in JavaScript.

Front

Can a variable name in JavaScript be initiated with a digit?

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No

Front

Why do we use camelCase or snake_case when naming variables in JavaScript?

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To make variable names more readable and understandable.

Front

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?

Back

Block scope

Front

Which of the following answer choices is NOT an example of a variable? 8, x, u, n

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8