JSFiddle - React, Tailwind, and code Playground

JavaScript

function oneFunc(myCallback)
{
     this.myVar = 1;
    var request = "request";
    var response = "response"
     //there is some widget calling
     myCallback.apply(this,[request,response]);
}

function callback(request, response){
   console.log(request);
    console.log(response);
    console.log(this.myVar);
}

oneFunc(callback);