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Discussion on: The significance of React keys - a visual explanation

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Regarding the opening statement - '...utilisation of the 'key' attribute on each element can be crucial for avoiding needless rerender performance hits.', am I right to say that the 'key' attribute doesn't prevent or reduce the number of times a component is re-rendered? Instead, it's more of making React's life easier when it comes to deciding what change is needed to update the browser DOM?

Love the explanation btw!