Defining Functions to be Passed Around as Arguments

Alright, so I've been looking at functions and using them as arguments. Let's say I have a function that takes a function and does it:

function run(someFunction,someArgument) {
    someFunction(someArgument);
}

I see that I can pass an existing function, say:

function foo(bar) {
    // foo that bar!
}

By calling run(foo,bar); I can also make up a function in an object on the fly and run it:

var whiteBoy = {
    playThat: function(funkyMusic) {
        // funk out in every way
    }
};

And then I call run(whiteBoy.playThat,funkyMusic); What I'd l开发者_开发百科ike to be able to do is define a function in the call, like this:

run(/* define a new function */,relevantArgument);

How would I go about doing that?

Like this:

run(function(funkyMusic) {
    // funk out in every way
}, relevantArgument);

You were very close when you wrote this:

var whiteBoy = {
    playThat: function(funkyMusic) {
        // funk out in every way
    }
};

What you did there was define a function and assign it to the playThat property - the only change that I made was to define a function and pass it as an argument instead of assigning it to something.

run(function(when)
   { 
      alert("play that funky music " + when);
   },
  "noooow!");