Question

I’m trying to add an argument to a function passed along as an argument in an express js route.

This is an expressjs route:

app.get('path', someFunc,
function(req, res, next) {
  res.render('layout');
});

The function someFunc right there takes the arguments req, res, next.

I want to add an additional argument to it. If I use apply or call it seems to replace all the existing arguments.

I want to be able to do:

someFunction (req, res, next, custom) {}

How can I do this? Thanks.

Answer 1

I am not sure that this is the best way but you could do something like this :

var someFunc = function (req, res, next, custom) { console.log(custom); next(); }

app.get('path', 
function (req, res, next) { someFunc(req, res, next, 'custom') },
function(req, res, next) {
    res.render('layout');
});