#37 How to use JS return | JavaScript Full Tutorial | Summary and Q&A

TL;DR

This lesson explains the function return keyword in JavaScript, which allows you to specify a return value for a function. It also explores the behavior of the return keyword and how to use it multiple times within function blocks.

Key Insights

• 🎵 By default, a function that doesn't explicitly use the return keyword will return undefined.
• 👉 The return keyword is used to specify a return value in a function.
• 🚫 Once the return keyword is executed, anything after it will not be executed.
• 🔁 The return keyword stops the execution of any other function called within the current function block.
• ⚠️ The return keyword can be used multiple times if placed inside separate code blocks (e.g., if statements).
• 🔐 The function can be assigned to a variable, and the variable can be used to invoke the function.
• 💬 Template literals can be used to log values along with a message to the console.
• 🔍 In task one, create a function called fave num that returns the number passed as the argument; log it using template literals. In task two, identify the output of the code provided.

Transcript

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Questions & Answers

Q: What happens when a function doesn't use the return keyword?

When a function doesn't use the return keyword, it will return undefined by default.

Q: How can the return keyword be used to specify a return value for a function?

To specify a return value for a function, you can use the return keyword followed by the value you want to return.

Q: What is the effect of executing the return keyword in a function?

When the return keyword is executed in a function, it stops the execution of the function and exits the function block.

Q: Can the return keyword be used multiple times within a function?

Yes, the return keyword can be used multiple times within a function, as long as each return statement is contained within its own code block.

Q: How can the return keyword be used to return different values based on conditions?

By using the return keyword within conditional statements, you can have multiple return statements that return different values based on the conditions specified.

Q: What are the benefits of using the return keyword to explicitly return values from a function?

Using the return keyword allows you to control the output of a function and make it more usable in your code. It also allows you to perform different actions based on the returned values.

Summary & Key Takeaways

• By default, a function that doesn't use the return keyword will return undefined.

• The return keyword allows you to specify a return value for a function.

• Executing the return keyword stops the execution of the function and exits the function block.

• The return keyword can be used multiple times within function blocks, as long as each return statement is in its own block.