TypeScript and field initializers

Question

How to init a new class in TS in such a way (example in C# to show what I want):

// ... some code before
return new MyClass { Field         


        

Answer 1

if you want to create new instance without set initial value when instance

1- you have to use class not interface

2- you have to set initial value when create class

export class IStudentDTO {
 Id:        number = 0;
 Name:      string = '';


student: IStudentDTO = new IStudentDTO();

Answer 2

I suggest an approach that does not require Typescript 2.1:

class Person {
    public name: string;
    public address?: string;
    public age: number;

    public constructor(init:Person) {
        Object.assign(this, init);
    }

    public someFunc() {
        // todo
    }
}

let person = new Person(<Person>{ age:20, name:"John" });
person.someFunc();

key points:

• Typescript 2.1 not required, Partial<T> not required
• It supports functions (in comparison with simple type assertion which does not support functions)