What is the good practice for using backend variables on frontend side?

To bind my data on the mobile side it works like this :

getHeros() {
    this.wakanda.getCatalog().then(ds => {
        ds['Superhero'].query({orderBy:"ID desc",pageSize:3}).then(collection => {
            this.favoriteSuperheroes = collection.entities;
        });
    });
}

But like this I work directly on the table. I have a method who provide me everything I want on the server side.

I want to know, if I call my method in the backend and store it in a variable like this:

var favoriteMethod = ds.Superhero.myDataClassMethod();

How I can use this variable on the mobile side ?

Your first example is probably the best. Another (longer) trick would be to:

• Create a request handler

  // Let's say you define a http://127.0.0.1:8081/getSuperHeroesData request handler httpServer.addRequestHandler('^/getSuperHeroesData$', 'super-heroes-module', 'getData');

• Define a super-heroes-module module in your backend/modules directory

  // modules/super-heroes-module/index.js exports.getData = function pong( request, response ){ return ds.Superhero.myDataClassMethod(); }

• So when you call http://127.0.0.1:8081/getSuperHeroesData from your mobile front end, it will trigger the getData method from super-heroes-module and return the result in your HTTP request response.

Wakanda request handler documentation