Microsoft Interview Question: Common js questions, scopes var let, implement Promise.all. Explain JS event loop. React render a parent will it render the child if there are no state changes in the child? (how to prevent re-render, useMemo). What are keys ?

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Common js questions, scopes var let, implement Promise.all. Explain JS event loop. React render a parent will it render the child if there are no state changes in the child? (how to prevent re-render, useMemo). What are keys ?

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