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 {
        public street: string,
        public number: number,
        public suffix: string,
        public houseLetter: string,
        public city: string,
        public zipcode: string,
    ) { }

export class User {
        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 {
        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


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;


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

[New Feature] Initialize Classes by Using an Object Initializer � Issue , Which allows you to initialize an object inline, without specifying the object everytime. But now I use a class with methods in it, so I cannot just switch to interfaces. MeirionHughes commented on Jun 8, 2016 • it is when you have a lot of nesting going on; I guess the initialisation of the objects would have to be flattened� Efficient way to initialize a nested object in Angular 8 Hot Network Questions Is it possible to download an app and install it on iPhone/iPad by using Finder

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);


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":""}


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TypeScript Arrays, There are two ways to declare an array in typescript: 1. Using square Advantages Code Optimization: We can retrieve or sort the array data more efficiently. Reactive forms provide a model-driven approach to handling form inputs whose values change over time. This guide shows you how to create and update a basic form control, progress to using multiple controls in a group, validate form values, and create dynamic forms where you can add or remove controls at run time.