What is the best way to refresh the properties in an object?

Question

What is the best way to refresh the properties in an object?

I am working with a custom type object defined as follows:

export interface IPupilFilter {
  Fullname: string;
  Gender: string;
  ClassType: number;
  Language: number;
  Class: number;
  ClassNumber: number;
  Phone: string;
  Movement: string;
}
public requestLoadPupils: IPupilFilter = <IPupilFilter>{};

As I fill out the form, this object is populated according to the defined interface.

What is the best way to reset all the value properties and set them to null?

I have attempted the following:

this.requestLoadPupils = <IPupilFilter>{} as IPupilFilter;

While I can reset each property individually like:

this.requestLoadPupils.Gender = null;

I would prefer a more efficient method.

typescript typescript2.0

Answer 1

Answer №1

Using the Partial type in TypeScript would be the solution in this case.

public requestLoadPupils: Partial<IPupilFilter> = {};

If you want to clear the object, you can simply assign it to a new empty object like this:

this.requestLoadPupils = {};

Once you are confident that the form has been filled out completely, you can cast it back to a full IPupilFilter like so:

const pupilFilter = this.requestLoadPupils as IPupilFilter;

When you use Partial on an interface, it essentially makes all the properties optional. For example:

type PartialIPupilFilter = Partial<IPupilFilter>

Is equivalent to:

interface PartialIPupilFilter {
  Fullname?: string;
  Gender?: string;
  ClassType?: number;
  Language?: number;
  Class?: number;
  ClassNumber?: number;
  Phone?: string;
  Movement?: string;
}

All the elements are still typed, but you don't have to set them during instantiation.

Answer 2

Using the Partial type in TypeScript would be the solution in this case.

public requestLoadPupils: Partial<IPupilFilter> = {};

If you want to clear the object, you can simply assign it to a new empty object like this:

this.requestLoadPupils = {};

Once you are confident that the form has been filled out completely, you can cast it back to a full IPupilFilter like so:

const pupilFilter = this.requestLoadPupils as IPupilFilter;

When you use Partial on an interface, it essentially makes all the properties optional. For example:

type PartialIPupilFilter = Partial<IPupilFilter>

Is equivalent to:

interface PartialIPupilFilter {
  Fullname?: string;
  Gender?: string;
  ClassType?: number;
  Language?: number;
  Class?: number;
  ClassNumber?: number;
  Phone?: string;
  Movement?: string;
}

All the elements are still typed, but you don't have to set them during instantiation.

What is the best way to refresh the properties in an object?

Answer №1

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