List And Keys, and why Keys are important?
Key's the very important aspect in rendering Lists. 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 (But this should be avoided). 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 component state.
Keys are very important and play a vital role in performance and we need to have an understanding of DOM render concepts in React. Once you get these concepts we can avoid bad practices and enhance the overall performance in some way.
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React,
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rendering lists in react
react tutorial
map() to render list in react jsx
List and keys
why keys are important in React / ReactJs
Why do We Need Keys in React?
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