Conditional callback for asynchronous file copy

Question

I'm trying to figure out the most elegant solution to do the following asynchronously using JavaScript (specifically node):

• Given a destination file name, check if it is a directory
• If it is a directory, delete it
• Copy a source file onto the destination file name

I would like to do this asynchronously using callbacks.

Here is what I have come up with:

 var preCopyOp = fs.lstatSync(dstFilename).isDirectory() ?
 function(callback) {
 rimraf(dstFilename, callback)
 } :
 function(callback) {
 callback();
 };
 preCopyOp(function() {
 ncp(srcFilename, dstFilename, function(err) {
 if(err) {
 return console.error(err);
 }
 }); 
 });

The no-op passthrough function seems like a bit of a kludge to me. Is there a more elegant way to do this?

Answer 1

You can write

function(callback) {
 callback();
}

as just

callback