Thenullish coalescing operator will help us to define nullary values equality (null orundefined), unlike the || operator.
constbasketValue=0;constorBasketValue=basketValue||14;constnullishBasketValue=basketValue??14;What happened here ?
Thenullish coalescing operator (the??) is alogical operator that returns itsright-hand side operand when itsleft-hand side operand isnull orundefined. Otherwise returns itsleft-hand side operand.
|| implicitly converts our number to nullish value and returns14.?? checks the value ofbasketValue (different to nullary values) and returns0
So, in our example, theorBasketValue is equal to14 andnullishBasketValue is equal to0.
That's it, make good use of it !
I'm not a native English speaker so, thanks in advance if you want to improve my article with correct syntax/grammar/sentences.
I can accept all kind remarks :)
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Top comments(2)
This is a really nice feature to pull apart nullish and falsy values. I'd love to have this kind of behavior in conditionnal evaluation. Sometimes zero (as number) or empty string are expected values and having to handle nullish versus falsy is not really elegant. Hope this will come soon.
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If you want to try it, it's available in TypeScript since the version 3.7 !
In other hand, you can also try it directly in some browsers.
dev-to-uploads.s3.amazonaws.com/i/...
Let's give it a try ! ❓❓
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