Learn Basic String and Array Methods by Building a Music Player - Step 53

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i forget (userData?.) that mean?
why join “?” Question mark?

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userData?.currentSong?.id

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Challenge Information:

Learn Basic String and Array Methods by Building a Music Player - Step 53

Hi @kiss771119

The optional chaining operator is used when you want to access an objects property, and if it does not exist to return undefined instead of throwing an error.

Happy coding

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