creating TypeScript model classes is essential to organizing and structuring your

Question

creating TypeScript model classes is essential to organizing and structuring your

My approach to defining model classes involves using the following structure:

export class Company {
  constructor(
    public id?: number,
    public name?: string,
    public shortName?: string
  ) {}
}

I utilize the ? symbol to prevent errors when assigning an empty company object to a variable, such as in this example:

this.editDataItem = new Company();

Is there a way to eliminate the need for using ? in the model declaration? Is this method appropriate for creating instances with empty properties? Are there any recommended best practices for handling this situation?

angular typescript

Answer 1

Answer №1

If you prefer, you can also achieve the same results in JavaScript with the following code:

class Company {
  constructor(
     id = 0,
     name = '',
     shortName = ''
  ) {}
}

const company1 = new Company();

console.log(company1);

In Typescript, here's how you can do it:

export class Company {
  constructor(
    public id: number = 0,
    public name: string = '',
    public shortName: string = ''
  ) {}
}

const company1 = new Company();

console.log(company1);

The code snippet above demonstrates setting default values even if parameters are not passed. This approach using ? allows for accepting undefined as a valid value.

Answer 2

If you prefer, you can also achieve the same results in JavaScript with the following code:

class Company {
  constructor(
     id = 0,
     name = '',
     shortName = ''
  ) {}
}

const company1 = new Company();

console.log(company1);

In Typescript, here's how you can do it:

export class Company {
  constructor(
    public id: number = 0,
    public name: string = '',
    public shortName: string = ''
  ) {}
}

const company1 = new Company();

console.log(company1);

The code snippet above demonstrates setting default values even if parameters are not passed. This approach using ? allows for accepting undefined as a valid value.

Answer 3

Answer №2

The symbol ? is actually a convenient shortcut for representing undefined. To ensure that a property is not left as undefined, you should initialize it either by providing values in the constructor or setting default values.

For certain scenarios, this method of defining property types within models is entirely valid and accurate.

You could also modify your class like so:

export class Company {
  id?: number;
  name?: string;
  shortName?: string;

  constructor(
  ) {}
}

With this change, your public properties will default to being undefined, eliminating the need to pass any values to the constructor.

Answer 4

The symbol ? is actually a convenient shortcut for representing undefined. To ensure that a property is not left as undefined, you should initialize it either by providing values in the constructor or setting default values.

For certain scenarios, this method of defining property types within models is entirely valid and accurate.

You could also modify your class like so:

export class Company {
  id?: number;
  name?: string;
  shortName?: string;

  constructor(
  ) {}
}

With this change, your public properties will default to being undefined, eliminating the need to pass any values to the constructor.

creating TypeScript model classes is essential to organizing and structuring your

Answer №1

Answer №2

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