How to make a loop wait for a function?

Question

JavaScript

Good afternoon. There are 2 functions:

function showUser(data) {
  for (var k = 0; k < 10; k++) {
    arrayMess = [];
    getMes(data[k][0],data[k][0] );
  }
}
function getMes(data1,data2) {
      var i = 200;
      var timerId = setInterval(function() {
        addScript('https://api.vk.com/method/execute?code=' + encodeURIComponent('var mes = API.messages.getHistory({"user_id":'+ data1 +',"count": 200});var i = '+ i +';var arr = [];arr = arr + [email protected]_id;while (i < ('+ i +' + 4800) ) {var mes = API.messages.getHistory({"offset":i,"user_id":'+ data1 +',"count": 200});arr = arr + [email protected]_id;i = i + 200;}return {"count":mes.count,"users":arr};') + '&access_token=' + token + '&callback=showMess&v=5.69');
        if (data2 == arrayMess.length) { 
          clearInterval(timerId);
        }
      i = i + 5000;
      }, 1000);	
}

After the showUser function is launched, the cycle starts to work and pull another function, now for some reason it immediately works out and calls a bunch of functions, but it is necessary that it waits for the function that it launches to work and only then continues, how to do this?

Answer 1

With async/await you can do this: https://jsfiddle.net/rockon404/ewpbd4bv/