Efficient way to initialize a nested object in Angular 8

Efficient way to initialize a nested object in Angular 8

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I have a User class with a nested Address class. In the component I would like to initialize an object of type User with something like let user = new User() or let user:User.

But errors are thrown, because Angular/Typescript wants me to assign values. Is there an efficient way to do this, without assigning all the empty "" values to the object.

Below the classes:

class Address {
    constructor(
        public street: string,
        public number: number,
        public suffix: string,
        public houseLetter: string,
        public city: string,
        public zipcode: string,
    ) { }
}

export class User {
    constructor(
        public id: number,
        public firstName: string,
        public lastName: string,
        public email: string,
        public address: Address,
    ) { }
}

You can mark these parameters as optional like this:

export class User {
    constructor(
        public id?: number,
        public firstName?: string,
        public lastName?: string,
        public email?: string,
        public address?: Address,
    ) { }
}

now you can easily instantiate user object with let user = new User()

Working demo link

TypeScript: Easier way to Initialize Nested Objects?, Try this: let myObj = { prop1: 'foo', pop2: 'bar', childObj: { childProp: 'my child prop' } } as MyObj;. Kara Erickson of the Angular Core Team presented this approach at the Angular Connect 2017 . Three Ways to implement nested forms: We will see the most commonly used techniques to implement nested


you can try like this

Model

export class AddressModel {
    constructor(data?: any) {
    if (data != null) {
        this.street = data.street;
        this.number = data.number;
        this.suffix = data.suffix;
        this.houseLetter = data.houseLetter;
        this.city = data.city;
        this.zipcode = data.zipcode;
    }
 }
        public street: string = null;
        public number: number = null;
        public suffix: string = null;
        public houseLetter: string = null;
        public city: string = null;
        public zipcode: string = null;
}

TS

someFunction() {
let data = new AddressModel({data to pass}); // here we are passing the data
}

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I use this pattern:

export class Address {
    street: string;
    number: number;
    suffix: string;
    houseLetter: string;
    city: string;
    zipcode: string;

    constructor(values? : Partial<Address>)
    { 
        Object.assign(this, values);
    }
}

export class User {
    id: number;
    firstName: string;
    lastName: string;
    email: string;
    address: Address;
    constructor(values? : Partial<User>)
    { 
        Object.assign(this, values);
    }
}

Usage:

const p1 = new User();

const p2 = new User({
  firstName: 'paul',
  address: new Address({
    street: '1 st james street'
  })
});

Passing data between nested components with Angular - DEV, With the change to one-way data binding in Angular, data is passed down through Declare the object and instantiate a new instance in the constructor. There are more efficient ways to display the information, for example,� 1. Understand Nested Forms in Angular 9/8/7. Let’s assume if a user requires to add an item using the form. In this kind of condition, you have to create a form which allows a user to add dynamic form fields to add additional data.


This seems to work fine:

export class User {
  public id: number = 0;
  public firstName: string = "";
  public lastName: string = "";
  public email: string = "";
}

In TS:

user = new User();
 constructor() {
  console.log(this.user); // {"id":0,"firstName":"","lastName":"","email":""}
}

Online_Demo

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