How to access calling function from called function in node.js?

Question

How to access calling function from called function in node.js?

I want to know calling return parent function in child function.

app.get('/path', function(req, res, next) {
        var result = child('test_Val', next);

        return res.send(200);
    }); 

function child(arg1, next) {
   if (condition) {
      //I want to call return parent function with next() here.
   }
}

Is it possible?

node.js
express

Answer 1

To preface, you really shouldn't do this. Your question almost certainly means that you're designing something wrong, and doing this will disable large swathes of optimizations in v8.

But you can do it.

From inside a function, the magic variable arguments is available. This is an array-like that contains all of the arguments to that function. Additionally, it has some interesting properties - one of which is callee. This is a reference to the function you're currently in. It also has a few interesting properties. One is arguments, which points back to the original arguments object. The one we're looking for is caller.

So, from inside a function, arguments.callee.caller is a reference to the calling function.

Again, please don't do this. You should ask another question with more context so that someone can help you solve the real problem here.