1. Singleton
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class Singleton { private static instance: Singleton; private constructor() { } public static getInstance(): Singleton { if (!Singleton.instance) { Singleton.instance = new Singleton(); } return Singleton.instance; } public someBusinessLogic() { console.log("Excute some business logic") } } // new Singleton() ==> throw exception const s1 = Singleton.getInstance(); const s2 = Singleton.getInstance(); console.log("s1 === s2 =>", s1 === s2) // true // ==> 1 Class chỉ tạo 1 instance duy nhất s1.someBusinessLogic() |
2. Fluent Interface
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class Student { private _name!: string | null private _age!: number | null setName(value: string) { this._name = value return this } setAge(value: number) { this._age = value return this } getInfo(): string { return `Student: ${this._name} - ${this._age} year(s) old ` } } // ==> Sử dụng "return this" để có thể dùng 1 chuỗi câu lệnh const newStudent = new Student().setName('Peter').setAge(20).getInfo() // Student: Peter - 20 year(s) old |
