How to execute a method passed as parameter to function

I want to write my own function in JavaScript which takes a callback method as a parameter and executes it after the completion, I don't know how to invoke a method in my method which is passed as an argument. Like Reflection.

example code

function myfunction(param1, callbackfunction)
{
    //do processing here
    //how to invoke callbackfunction at this point?
}

//this is the function call to myfunction
myfunction("hello", function(){
   //call back method implementation here
});

Solution 1:

You can just call it as a normal function:

function myfunction(param1, callbackfunction)
{
    //do processing here
    callbackfunction();
}

The only extra thing is to mention context. If you want to be able to use the this keyword within your callback, you'll have to assign it. This is frequently desirable behaviour. For instance:

function myfunction(param1, callbackfunction)
{
    //do processing here
    callbackfunction.call(param1);
}

In the callback, you can now access param1 as this. See Function.call.

Solution 2:

I too came into same scenario where I have to call the function sent as parameter to another function.

I Tried

mainfunction('callThisFunction');

First Approach

function mainFuntion(functionName)
{
    functionName();
}

But ends up in errors. So I tried

Second Approach

functionName.call(). 

Still no use. So I tried

Third Approach

this[functionName]();

which worked like a champ. So This is to just add one more way of calling. May be there may be problem with my First and Second approaches, but instead googling more and spending time I went for Third Approach.

Solution 3:

function myfunction(param1, callbackfunction)
{
    //do processing here
   callbackfunction(); // or if you want scoped call, callbackfunction.call(scope)
}