How do I judge if a field returned by an interface is not null?

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1

Which keyword can be used to determine whether a field value is not null?

2

Hi @caiman2012

Can you provide a code sample of what the current code is and elaborate what you’re trying to do on it ? The question is too abstract.

Cheers !

4

For example, in the return field of an interface
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I want to determine which keywords are needed to determine if “data” is not null
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5

Hi, please see if this tutorial helps:

Cheers !

6

Oh , I see. Thanks a lot.