JSFiddle - React, Tailwind, and code Playground

JavaScript

function manager()
{
   var managerParam =0;
   httpGet(function() {
      //this function can use managerParam
      managerParam ++;
   });

  console.log(managerParam === 1); //true
}

function httpGet(onsuccess)
{
   onsuccess();
}

manager();