How to achieve waiting for the result of a function in an if statement?

Question

Node.js

function testFunc() {
  async.series([
    function(down) {
      setTimeout(function(){
        down();
      }, 10000);
    }
  ],
  
  function() {
    return true;
  });
};

if(testFunc()) console.log('Result function: true');
else console.log('Result function: false');

After running, I get: Result function: false
It is understandable, because return true; in testFunc, will come only after 10 sec.
How to make an if statement wait for the result of the testFunc function?

Answer 1

You can also make it look completely synchronous with the help of generators (plus promises).
You can already safely use it in a node, plus getting rid of unlimited nesting and crap debugging.
habrahabr.ru/sandbox/67590

Answer 2

If it is simpler and without callbacks, then move this operator inside the function. Well, in general, google "Asynchronous JS".