Software Engineer Front End Interview Questions

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Can you explain the difference between the Task (Macrotask) Queue and the Microtask Queue in the JavaScript Event Loop? Specifically, how does the browser prioritize Promise resolutions over scheduled callbacks from a setTimeout function, and what impact does this have on UI rendering performance?
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Software Engineer - Front End

Interviewed at Amazon

3.5
Mar 25, 2026

Can you explain the difference between the Task (Macrotask) Queue and the Microtask Queue in the JavaScript Event Loop? Specifically, how does the browser prioritize Promise resolutions over scheduled callbacks from a setTimeout function, and what impact does this have on UI rendering performance?

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