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JavaScript React by Example Building the Application Writing a Handler to Confirm Guests

Posted by Ran Wang
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Ran Wang
Full Stack JavaScript Techdegree Graduate 32,191 Points

return() and return{}

In the video at say 7:00. The return inside the map uses {}. which as far as I understand will returns a new object since objects are inside {}. But what does return() stands for? Anything can be returned inside ()? An array, string, func or an object? Thank you.

2 Answers

Steven Parker
Steven Parker
231,236 Points
Steven Parker
Steven Parker
231,236 Points

Since "return" is a statement keyword and not a function, it does not need parentheses. If you use some anyway, they are interpreted as a grouping operator and part of the following expression.

And yes, most any kind of thing can be returned.

Torben Korb
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PLUS
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Torben Korb
Front End Web Development Techdegree Graduate 91,433 Points
Torben Korb
.a{fill-rule:evenodd;}techdegree seal-36
Torben Korb
Front End Web Development Techdegree Graduate 91,433 Points

Using parentheses when returning is necessary if you want to write your return statement over several lines (from https://stackoverflow.com/questions/20824558/why-use-parentheses-when-returning-in-javascript).

Returning several lines is something you can see commonly in React when returning component code. Happy coding!