Set type for function parameters?

Question

Is there a way to let a javascript function know that a certain parameter is of a certain type?

Being able to do something like this would be perfect:

Answer 1

Not in javascript it self but using Google Closure Compiler's advanced mode you can do that:

/**
 * @param {Date} myDate The date
 * @param {string} myString The string
 */
function myFunction(myDate, myString)
{
    //do stuff
}

See http://code.google.com/closure/compiler/docs/js-for-compiler.html