What are the benefit of assigning function results to variables vs calling inline?

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I'm learning Firebase. In many code examples I see something like this:

const auth = getAuth();

await signInWithPopup(auth, provider);

while in firebase web codelab they call getAuth directly:

await signInWithPopup(getAuth(), provider);

same thing with getFirestore.
so which one is the correct way of doing it and if they are both the same what is the better practice?

edit: when I need to use auth object more than once will I get any performance benefits by calling getAuth once and assigning it to a variable?

firebase-authentication firebase web google-cloud-platform javascript
3 Answers

These two code examples are functionally the same. The first example is simply more verbose.

user_95990220

If you don't need to reuse the auth variable, then you can simply call it directly.

It doesn't have any significant difference in this case.

user_5435750

There's no difference between those two approaches. If you want to use the result that is returned by getAuth(), only once, it makes sense to use it like this:

await signInWithPopup(getAuth(), provider);

Otherwise, save it to the auth variable and use it as many times as you want. In terms of performance, there is no difference at all.

user_52468850
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