Why are globals bad?

Question

It totaly makes sense to me to use it here. What would be the alternative? How can i generaly avoid to use them and most of all why is it bad according to jsLint to make us

Answer 1

Globale variables could clash with other Scripts or be overwritten. When you don't need a global, it's advisable to avoid them. Simply use var (or let if your JS-Version-Support is greater than 1.7):

(function() {
  var foo = 'bar';
  alert(foo);
})();