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This article mainly shows you "JavaScript how to use null merge operator", the content is easy to understand, clear, hope to help you solve your doubts, the following let Xiaobian lead you to study and learn "JavaScript how to use null merge operator" this article.

Null merge operator'?'

We sometimes use ternary operations to simplify if...else... Or return a default value

Const foo = () = > {return student.name?.firstName? Student.name.firstName: 'firstName do not exist'} console.log (foo ())

In this case, we can further simplify the code through null merging

Const foo = () = > {return student.name?.firstName? 'firstName do not exist'} console.log (foo ())

Very similar to the or | operator, but? It only works on undefined and null to avoid the trouble of having a value of 0.

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