What is "key" prop and what is the benefit of using it in arrays of elements?
- A prop that determines the order of elements in an array
- A prop that provides a unique identifier for each element in an array
- A prop that specifies the position of an element in an array
- A prop that specifies the type of each element in an array
The "key" prop in React is a special prop that provides a unique identifier for each element in an array of elements. It is used to optimize the performance of rendering by allowing React to identify which elements have changed, and to update only those elements instead of re-rendering the entire list. The "key" prop should be a unique and stable identifier for each element, such as an ID or index.
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