Q. Which operator delays emissions for a specific time?
Q. Which operator groups emitted values by a key?
Q. Which operator emits only when the value changes?
Q. Which operator runs inner Observables sequentially?
Q. Which operator ensures only one inner Observable runs at a time and ignores new ones?
Q. Which operator converts a Promise into an Observable?
Q. What does throttleTime() do?
Q. Which operator buffers values and emits them as an array periodically?
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