Typescript error: Object may be 'undefined' when using object literals

I am encountering an issue when trying to run the same code in my Typescript application that works fine in the browser console:

[{ssid: 'Test Network 1', rssi: 54},{ssid: 'Test Network 2', rssi: 60}].find((rec) => 'Test Network 1' === rec.ssid).rssi

54

However, Typescript is giving me an error message saying "Object is possibly 'undefined'":

[{ssid: 'Test Network 1', rssi: 54},{ssid: 'Test Network 2', rssi: 60}].find((rec) => 'Test Network 1' === rec.ssid).rssi;

What changes do I need to make to resolve this issue?

typescript

Answer №1

When using the find method, it's important to remember that it may not always return the desired result and could potentially be undefined. To handle this situation, you can use the '?' operator.

[{ssid: 'Home Network', rssi: 75},{ssid: 'Office Network', rssi: 68}].find((rec) => 'Home Network' === rec.ssid)?.rssi;

Answer №2

It's important to note that adding a question mark after the closing round bracket is necessary. Using find can result in returning undefined if no object matches the given condition. Even though this may not occur in your specific example, it's still advisable to implement optional chaining to handle such scenarios.

[{ssid: 'Test Network 1', rssi: 54},{ssid: 'Test Network 2', rssi: 60}].find((rec) => 'Test Network 1' === rec.ssid)?.rssi;

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