Double Question Marks TypeScript 3.7 - Nullish Coalescing. We explore what Nullish Coalescing, aka. the 'double question mark' operator means, and how you might use it in some real world use cases.
The feature is called Nullish Coalescing and it’s summed up here by the good folks at TypeScript. But if you’re a glutton for punishment, please read on.
I’m sure we’d all appreciate a bit more coalescing in the world, but for now we can settle for it in our code. Exactly what is Nullish Coalescing and why do we need it?
The answer is, it’s similar to this:
const mayBeThisThingOrThisOtherThingIfNot = thisThing || thisOtherThing <>
but not exactly.
If you’re still here, let’s look at how operator in question differs from the above code. Well, for a start, you’d write it like this instead:
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