Ha, siz PlaceHolder interfeysga quyidagi usulni qo'shishingiz mumkin: ``ts interfeys PlaceHolder {firstname?: string; secondName?: string; age?: string; number; visits?: number; email?: string; getGreeting: string; } ``` The getGreeting () usuli shaxsni to'liq ismi bilan salomlashadigan va qancha tashrif buyurganligini aytib beradigan qatorni qaytaradi. Ushbu usulni PlaceHolder interfeysini amalga oshiradigan sinf yoki ob'ektda quyidagicha amalga oshirishingiz mumkin: ``ts person: PlaceHolder = {firstname: "John", secondName: "Doe", visits: 30, 5, email: "johndoe@example.com", {((((((((((((((((((((((((((((
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