Why component needs key attribute! #react #reactjs #reactcomponent #coding #frontenddevelopment #new

Keys help React identify which items have changed, are added, or are removed. Keys should be given to the elements inside the array to give the elements a stable identity.
The best way to pick a key is to use a string that uniquely identifies a list item among its siblings. Most often, you would use IDs from your data as keys. When you don’t have stable IDs for rendered items, you may use the item index as a key as a last resort.

We don’t recommend using indexes for keys if the order of items may change. This can negatively impact performance and may cause issues with the component state.

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