Tips on coding Javascript for performance

  //FROM

  for (var i = 0; i < myArray.length; i++) {
    ...
  }

  //TO

  var arrayLength = myArray.length;
  
  for (var i = 0; i < arrayLength; i++) {
    ...
  }

---

  //FROM
  var myVar = "Hello World";
  
  function printHello() {
    console.log(myVar);
  }

  //TO
  var myVar = "Hello World";
  
  function printHello(myVar) {
    console.log(myVar);
  }

---

Any other tip for general Javascript performance?