Is there a JS equivalent for C# "?." operator?

Question

What I'm looking for is actually a shortcut for JS obj.fn && obj.fn(); code. One of the reasons for that is sometimes the obj.fn part might be quite long.

C# uses the Null Conditional Operators for that: obj?.fn()

Is it the null coalescing operator you are talking about? It's already there... `?:` — Praveen Kumar Purushothaman, Sep 04 '18 at 15:25
No, actually there's no such operator available in JavaScript, but it's planned for a future version: https://tc39.github.io/proposal-optional-chaining/ — Andreas, Sep 04 '18 at 15:30
@PraveenKumarPurushothaman That's not a duplicate. `?.` is not the same as `??` which is the acutal _null coalescing_ operator for C# — Andreas, Sep 04 '18 at 15:32
Seems like they are thinking about to implement this functionality but at date of March 2018 they still didn't include this. https://www.beyondjava.net/elvis-operator-aka-safe-navigation-javascript-typescript — rihhot, Sep 04 '18 at 15:32
@PraveenKumarPurushothaman this is not a duplicate of that question. — TheSoftwareJedi, Sep 04 '18 at 16:14
So there's a Babel plugin: https://stackoverflow.com/a/47538150/201303 — Julian, Sep 04 '18 at 19:37

score -2 · Answer 1 · answered Sep 04 '18 at 15:25

-2

One of the reasons for that is sometimes the obj.fn part might be quite long.

var a = obj.fn;
a && a();

Now you only use the long part once. That's likely the closest you'll get in javascript.

answered Sep 04 '18 at 15:25

Joel Coehoorn

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If you're going to do that, you probably need to bind the function back to `obj`. – Sep 04 '18 at 19:24

Is there a JS equivalent for C# "?." operator?

1 Answers1