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並前往https://www.quora.com/What-is-Question-mark-and-Dot-syntax-in-React-JS-and-where-do-we-use-this-syntax

What is ?. (Question mark and Dot) syntax in React JS ... - Quora

The ?. is called Elvis Operator (optional chaining) in JavaScript. It is basically used while accessing some property on an object to avoid null or ...

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