Typescript inherit constructor param object

Question

import hospital from "./hospital.json";


class Hospital {
    constructor(public hospital) {
   
    }
    ...other_methods

}

const SampleHospital = new Hospital(hospital);

I have raw data which is hospital.json.

I decided to create a class for a hospital to add some methods to the hospital.

The problem is

When I want to access to hospital's field there will always be extra access .hospital.

SampleHospital.hospital.contact

I want to make it SampleHospital.contact.

Of course, I can add another public field.

But to create every public field for hospital object will require a lot of effort.

---

I tried

type THospital = typeof hospital ;
class Hospital implements THospital {
    constructor(hospital: THospital) {
        [...Object.keys(hospital)].forEach(key => this[key] = hospital[key])
    }
}

But the typescript didn't understand my field assignment.

It says fields are missing

Answer 1

you can loop on all keys of parameter object and assign current object to parameter object value

const hospital = {
  name: 'win',
  contact: 'test'
};

class Hospital {
  constructor(hospital) {
    [...Object.keys(hospital)].forEach(key => this[key] = hospital[key]);
  }
}

const SampleHospital = new Hospital(hospital);

console.log(SampleHospital.name);

In typescript you will have to say my type can have other property you have to use index signature for this [index: string]: any;

const hospital = {
    name: 'win',
    contact: 'test'
  };
  
  class Hospital {
    [index: string]: any;
    constructor(hospital) {
      [...Object.keys(hospital)].forEach(key => this[key] = hospital[key]);
    }
  }
  
  const SampleHospital = new Hospital(hospital);
  
  console.log(SampleHospital.name);