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ES6 and Beyond

  10. 10
    Safely Access a Property on a JavaScript Object with Optional Chaining
    31s

Safely Access a Property on a JavaScript Object with Optional Chaining

Laurie Barth
InstructorLaurie Barth
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Published 4 years ago
Updated a year ago

You can use optional chaining to access properties of an object. If the parent property exists, it acts as a typical dot accessor. If not, optional chaining prevents an error from being thrown and instead returns undefined.

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Laurie Barth: [0:01] Define an object with an internal key-value pair {node: 1}. Object.node is equivalent to 1. If we use optional chaining ?., we still get 1.

[0:17] Define a new object that's null. If we attempt to access node on this object, we'll get an error. If we use optional chaining, we'll instead receive undefined.

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