title: How to change a variable used as argument for function
body: <p>I've looked around a little bit, and I haven't found a clear answer as to why when this proceeding code is ran, it returns myInt as 0. I've read posts about how the variable is only changed inside the function, but from my perspective, I don't see any reason why myInt cannot be changed. For refrence, this is in Javascript.</p>
  
  <pre><code>var myInt = 0;
  
  function changeVar(x) {
      x += 1;
  }
  changeVar(myInt);
  console.log(myInt);
  </code></pre>