Original example Rewrite to dynamic var: https://gist.github.com/qfox/5652201 Rewrite to global var: https://gist.github.com/qfox/5652207

x.js

// Rewrite to dynamic var: https://gist.github.com/qfox/5652201
// Rewrite to global var: https://gist.github.com/qfox/5652207

// original
function start(x){
  var foo = 0;

  if (x === 1) foo = 1;
  else if (x === 2) foo = 2;
  else if (x === 3) foo = 3;
  else if (x === 4) foo = 4;
  else foo = 5; 

  return foo;
}