I'm diving into ExpressJS lib at /lib/router/index.js
, it declares as below:
var proto = module.exports = function(options) {
var opts = options || {};
function router(req, res, next) {
router.handle(req, res, next);
}
// mixin Router class functions
setPrototypeOf(router, proto)
router.params = {};
router._params = [];
router.caseSensitive = opts.caseSensitive;
router.mergeParams = opts.mergeParams;
router.strict = opts.strict;
router.stack = [];
return router;
};
proto.handle = function handle(req, res, out) {
var self = this;
debug('dispatching %s %s', req.method, req.url);
var idx = 0;
var protohost = getProtohost(req.url) || ''
.........
}
I confused why they can not invoke directly, by a given way like that
return function(req, res, next) {
handle(req, res, next);
}
it seems it is clearer and simpler.