从自身传递回调函数作为参数

Question

Is it possible for me to pass a callback parameter to another method from within the callback function block itself? Example:

var resultCallback = function(result){
   if(result)
   {
       alert('success!');
   }else{
       callServiceB(resultCallback );
   }
}

callServiceA(resultCallback);

The reason of this is i wish to workout something like a Chain of Responsibility patterns in javascript.

Tried googled but so far gets nothing. Any idea or comment is welcomed.

Answer 1

Is it possible for me to pass a callback parameter to another method from within the callback function block itself?

Yes you can. Try it!

I wish to workout something like a Chain of Responsibility patterns

Putting both the responsibility chain ( callServiceB(resultCallback) ) and the resulting action ( alert('success!') ) in the same function looks like a bad practise/design smell. You should use an extra callback for the result, and separate the declaration of the chain from that.

It might then look like callServiceA(orCallServiceB(alertResult)) or either(callServiceA, callServiceB, …)(alertResult) .

The logic is like 1. call function a 2. if function a ok, then call function b 3. if function b ok, then call function c, and so on.. – ipohfly 8 mins ago

That doesn't sound like a chain of responsibility , where you call the next function only if the current one failed (couldn't process the arguments)? What you describe sounds more like monadic chaining (one action relying on the previous one) - take a look at promises for that:

 callServiceA.then(callServiceB).then(…).then(resultCallback);