What happens when you call `Promise.all()` with an empty array?

When Promise.all() is called with an empty array, it resolves immediately with an empty array. This behavior aligns with the way promises work, as Promise.all() is designed to aggregate results from multiple promises. When there are no promises in the array (an empty array), there are effectively no promises to wait for, and thus it resolves immediately.

This feature can be particularly useful in scenarios where you might dynamically generate an array of promises and could end up with no promises to wait for. The immediate resolution with an empty array ensures that your code can handle such cases gracefully without encountering an error.

Furthermore, this behavior is part of the specification for promises, making it consistent across implementations. It allows developers to write more resilient code by not having to add special case handling for empty inputs into Promise.all().