TypeError: undefined is not an object (evaluating ....)

Question

TypeError: undefined is not an object (evaluating ....)

legaciespanda opened this issue 3 years ago · comments

When I fetch data from an API and save in the state array. When I try to use the data saved in the state. It shows me the error above.

The issue is on stack overflow https://stackoverflow.com/questions/65606216/react-native-deck-swiper

Bogdan Pop · Answer 1 · Sat Jan 09 2021 12:54:37 GMT+0800 (China Standard Time)

Looks like you have undefined cards. Try using a debugger in your card rendering method to see what are the card contents prior to throwing the error.

Alternatively you can update the card method to return card && (cardContent) || null which should fix the rendering issue if you get undefined or null cards.

Ernest Obot · Answer 2 · Sun Jan 10 2021 06:00:46 GMT+0800 (China Standard Time)

Thanks
@webraptor
I was able to solve the problem with the code below

renderCard={(card) => (card && <Cardz card={card} />) || null}

Ernest Obot · Answer 3 · Sun Jan 10 2021 06:02:36 GMT+0800 (China Standard Time)

Thanks, i have solved the issue. Issue closed

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On Sat, 9 Jan 2021 at 05:54, Bogdan Pop ***@***.***> wrote: Looks like you have undefined cards. Try using a debugger in your card rendering method to see what are the card contents prior to throwing the error. Alternatively you can update the card method to return card && (cardContent) || null which should fix the rendering issue if you get undefined or null cards. — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#342 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AKBFKNVJ5RFOBKZGUK3JO5DSY7ORTANCNFSM4V22WT7A> .