Javascript how to assign multiple nested class instances from json object

August 24, 2022

I have a json with the below format:

let js = {
      "a": 1,
      "b": [
        {
          "h": "example",
          "v": 12
        },
        {
          "h": "example1",
          "v": 23
        }
      ]
    }

I have a class that takes in this json from constructor turning it into an instance of this class:

class A{
    constructor (json){
        Object.assign(this, json)
    }
}

This works well with:

a = new A(js)
console.log(f.a)

I have a second class which has the format of the inner list b:

class B {
    construtor(json){
        Object.assign(this, json)
    }
}

How can I instantiate class B from the object passed to A so that f.b[0] and f.b[1] above would be of type B?

>Solution :

try this,

class A{
    constructor (json){
        // create a new b array with instances of class B.
        json.b = json.b.map(json => new B(json))
        Object.assign(this, json)
    }
}