4:
type GetPatientsGroup<Patients extends Patient[], Group> = UnionToTuple<{[P in keyof Patients] : Patients[P] extends Group ? Patients[P] : never}[number]> type SeparateByArray<Group extends any[]> = {[Key in keyof Group]: [Group[Key]]}; type Segragate<Patients extends Patient[]> = { sick: GetPatientsGroup<Patients, Sick>, quarantine: SeparateByArray<GetPatientsGroup<Patients, Quarantine>>, healty: GetPatientsGroup<Patients, Healthy>, }
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4:
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