return() and return{}

Question

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.

Steven Parker · Accepted Answer

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 (https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Grouping) and part of the following expression.
And yes, most any kind of thing can be returned.

Torben Korb · Answer

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!

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Ran Wang

Ran Wang

return() and return{}

2 Answers

Steven Parker

Steven Parker

Torben Korb

Torben Korb