1

I understood that the best practice with setTimeOut is sending an anonymous function with the function I want to redo inside. Why won't it work? 

function movement(dir) {
    ...
    ...
        setTimeOut(function (){movement(dir);},21);
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3

It will work. Of course, the name of the function is setTimeout() instead of setTimeOut(). See this example:

function movement(dir) {
  console.log(dir);
  if (dir++ < 5) {
    setTimeout(function () {
      movement(dir);
    }, 21);
  }
};

movement(1);

It prints:

1
2
3
4
5
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