Best AnswerYou need to return the Key like this
keyExtractor={(item, index) => {
return item.id;
}}React-Native FlatList- Warning: Each child in an array or iterator should have a unique “key” prop, even after giving key={index}
General Tech Bugs & Fixes 2 years ago
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manpreet ![Tuteehub forum best answer]()
Best Answer
2 years ago
I am building the photo-feed application, project-repo-here , in the comments section after clicking on show-comments, it shows comment page on a device, but in a terminal, it breaks with error as,
error is in comments.js file.
Warning: Each child in an array or iterator should have a unique "key" prop.%s%s See documentationOfREact/react-warning-keys for more information.%s,
Check the render method of `VirtualizedList`., ,
in CellRenderer (at VirtualizedList.js:687)
in VirtualizedList (at FlatList.js:662)
in FlatList (at comments.js:212)
in RCTView (at View.js:44)
in comments (created by SceneView)
in SceneView (at StackViewLayout.js:795)
in RCTView (at View.js:44)
in AnimatedComponent (at StackViewCard.js:69)
in RCTView (at View.js:44)
in AnimatedComponent (at screens.native.js:59)
in Screen (at StackViewCard.js:57)
in Card (at createPointerEventsContainer.js:27)
in Container (at StackViewLayout.js:860)
in RCTView (at View.js:44)
in ScreenContainer (at StackViewLayout.js:311)
in RCTView (at View.js:44)
in AnimatedComponent (at StackViewLayout.js:307)
in Handler (at StackViewLayout.js:300)
in StackViewLayout (at withOrientation.js:30)
in withOrientation (at StackView.js:79)
in RCTView (at View.js:44)
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return, else is the same. I am following a tutorial, but the tutor does not return item.id, he simply gives the item.id like I did, but how didn't he get any error, without returning key? – ganeshdeshmukh 22 hours agoindex as keyinstead ofitem.id– ganeshdeshmukh 21 hours agokeyExtractor={(value, index) => index.toString()}if you don't use any braces it will simply return the result – Rishabh Rawat21 hours ago