1. The keys given to a list of elements in React should be ______.
Keys must be unique only among siblings in a list, not globally. They help React track which list items change during rendering.
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Atlassian · React
Practice React questions specifically asked in Atlassian interviews – ideal for online test preparation, technical rounds and final HR discussions.
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Keys must be unique only among siblings in a list, not globally. They help React track which list items change during rendering.
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The Real DOM updates the UI directly and is slow for frequent changes. The Virtual DOM is a lightweight copy stored in memory that React updates first, and only the differences are applied to the real DOM, making it much faster.