Today in “Things not to do when writing Javascript”

Pop quiz: what’s wrong with this piece of code?

function foo() {
  var route = route();
  // ...
}

The answer: it won’t do anything. That’s because in Javascript, everything is an object, including functions and variables, and they all share the same name space. By declaring a variable called route in the current scope, the function route() from the surrounding scope is hidden.