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setTimeout allows you to schedule a callback after a specified delay without blocking the main thread. When used inside a promise handler, it ensures the promise resolves only after the delay while still preserving asynchronous behavior.
Async programming and promise handling are common topics in frontend and JavaScript-focused interviews at large tech companies. Problems like this test your understanding of promise chaining, asynchronous control flow, and event loop behavior.
An array is typically used to store the list of promises and their delayed wrappers. Since each promise is processed independently, no complex data structure is required beyond iterating through the array.
The optimal approach is to wrap each promise in a new promise and delay its resolution using a timer such as setTimeout. By chaining a .then() handler, you can capture the original result and resolve it after the specified delay without blocking execution.