Handling optional parameters in javascript

Question

I have a static javascript function that can take 1, 2 or 3 parameters:

function getData(id, parameters, callback) //parameters (associative array) and callb         


        

Answer 1

I recommend you to use ArgueJS.

You can just type your function this way:

function getData(){
  arguments = __({id: String, parameters: [Object], callback: [Function]})

  // and now access your arguments by arguments.id,
  //          arguments.parameters and arguments.callback
}

I considered by your examples that you want your id parameter to be a string, right? Now, getData is requiring a String id and is accepting the optionals Object parameters and Function callback. All the use cases you posted will work as expected.