return properties from object using constructor function

问题

I have a constructor object that is created from a function, which is the response of a axios get request. I then want to return properties of that object and save some of the values to be used as a string in another class. eg: I want to be able to save values: response.data.name, response.data.address from the resposne. So far, im getting undefined when trying to get those values.

export class MyClass {

    private _myobject: any;

    constructor(myobject: any) {
        this._myobject = myobject;
    }

    public static async getData() {

            return axios.get(url)
                .then(response => response.data)
                .catch((error) => {
                    console.log(error);
                });
    }

    public static async getCurrentData() {
        return new MyClass(await this.getData());

    }

   getName() {
       console.log(this._myobject.name);
       return this._myobject.name;
   }
}

other class

const temp = new MyClass(Object).getName(); //  undefined
const temp = new MyClass({}).getName(); //  undefined

回答1:

MyClass.getCurrentData() creates a new instance of MyClass, which will contain any fetched data. This data however remains on this instance, it is not static.

Also, I don't see any await calls for the async function getCurrentData, so it can be that it is executed only after you're doing your getName() checks for debugging.

回答2:

my issue was solved as below:

export class MyClass {

    private _object: any;

    private constructor(object: any) {
        this._object = object;
    }

    private static async getData() {
        return axios.get(url)
            .then(response => response.data)
            .catch((error) => {
                console.log(error);
            });
    }

    // returns data from get request, adds to constructor of same class
    public static async getCurrentData() {
        return new MyClass(await MyClass.getData());
    }

    public getName() {  // getter uses constructor
        return this._object.name;
    }
}

export class Artifact {

    public async addDataToReport() {

        const myClass = await MyClass.getCurrentData(); //  create new instance of MyClass
        const name = myClass.getName(); // call getter from myClass

        console.log(name);
    }
}

来源：https://stackoverflow.com/questions/56725579/return-properties-from-object-using-constructor-function