Creating named parameter to base class in typescript and javascript

Question

I have created a base model class with is a model for the incoming data, I will be modeling the data inside of a class for some external reasons. Although I ran into a problem with is defining the incoming data into this model class.

This is my class

export class EntityBasic {
  constructor(
    public id: string,
    public title: string,
    public urn?: string,
    public risk_level?: string,
    public be_aware?: string,
    public body?: string,
    public published_at?: string,
    public created_at?: string,
    public updated_at?: string,
    public description?: string,
    public notes?: string,
  ) {}}
}

How I define the content inside of it in another page:

public getEntity(setEntity) {
    return new EntityBasic(
      setEntity.id,
      setEntity.title,
      setEntity?.urn,
      setEntity?.risk_level,
      setEntity?.be_aware,
      setEntity?.body,
      setEntity?.published_at,
      setEntity?.created_at,
      setEntity?.updated_at,
      setEntity?.report?.summary || '',
      setEntity?.report?.metadata?.source_notes,
      setEntity?.report?.metadata?.notes,
    );
  }

But defining the data like so, gave me problems, since some times there won't be a urn, or a risk_level for example, and the data will be messed up inside the class.
I would like a way to define like so (This didnt work):

public getEntity(setEntity) {
    return new EntityBasic(
      id = setEntity.id,
      title = setEntity.title,
      urn = setEntity?.urn,
      risk_level = setEntity?.risk_level,
    )
}

Can you not define a default value for each field? Or keep them null and overwrite this value in case there is a value from the incomming data. This way each field is atleast defined. — Allart
– Allart, Commented Nov 8, 2021 at 15:11

Xeelley · Accepted Answer · 2021-11-08 15:10:42Z

1

I believe wrap all parameters into one object is the best solution.

Wrap them as interface

interface EntityBasicParameters {
    id: string;
    title: string;
    urn?: string;
    risk_level?: string;
    be_aware?: string;
    body?: string;
    published_at?: string;
    created_at?: string;
    updated_at?: string;
    description?: string;
    notes?: string;
}

Accept only this object as constructor parameter

export class EntityBasic {
  constructor(params: EntityBasicParameters) {}}
}

Now you can pass existent data only

public getEntity(setEntity) {
    return new EntityBasic({
      id: setEntity.id,
      title: setEntity.title,
      urn: setEntity?.urn,
      risk_level: setEntity?.risk_level,
    })
}

or just

public getEntity(setEntity) {
    return new EntityBasic(setEntity)
}

answered Nov 8, 2021 at 15:10

Xeelley

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