1 / 17Scope & declarations★★★Phone screen
What's the difference between var, let, and const? When would you reach for each?
The Interview Room
Attempt each question out loud, reveal the model answer, then grade yourself. Progress is saved on this device. Pick a track to begin.
Can you reason about the language out loud, types, scope, and the async model, not just recite definitions.
← → move · space reveal · g got it · r review
Prefer the long-form guides?
Each track has full articles with context on how the round is run and why each answer matters.