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JavaScript developers know the pain of guarding against undefined nodes in nested objects well, with repetitive checks like:

`const street = user.address && user.address.street;`

The Optional Chaining ECMAScript proposal offers an elegant solution in the form of a new operator, like so:

`const street = user.address?.street // won't break if address is undefined`

2ality.com/2019/07/optional-ch

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