Implement Promise.all

Challenge summary

all equivalent that coordinates a collection of values and promises. The challenge covers ordering, empty input, normalization, and fail-fast rejection without revealing an implementation.

What you'll practice

• Normalize plain values and promises through one asynchronous contract.
• Preserve input order even when values settle in a different order.
• Resolve an empty input collection with an empty result.
• Reject as soon as any input rejects.

What Premium unlocks

Premium unlocks the runnable workspace, behavioral checks, implementation walkthrough, and edge-case discussion.