The Modern JavaScript Bootcamp (2019) - Undefined and Null

This video tutorial introduces the concepts of undefined and null in JavaScript. It explains how undefined is used to represent the absence of a value in variables, function arguments, and return values. The tutorial also covers how null can be used to explicitly clear a variable's value, differentiating it from undefined. Through examples, the video demonstrates how these concepts are applied in JavaScript programming.

What are the two types in JavaScript that represent the absence of a value?

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What happens when you create a variable in JavaScript without assigning it a value?

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How can you check if a variable has been assigned a value in JavaScript?

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In what situation would a function return undefined?

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How can you explicitly clear a variable's value in JavaScript?

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What is the difference between undefined and null in JavaScript?

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What does it mean when a variable is set to null in JavaScript?

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