[express]
$ express
- do '# npm install -g express' beforehand, express command
  generates nice template dir structure to get started
- last param in functions usually implies a callback
- app.param
    map/assosiate some logic to a 'route parameter(s)', so when you enter such route
    you can expect to have a variable filled for you, e.g. route: /sys/:id, let's say
    id is 'listdb', then a db would get preloaded by the time we stepped into the route logic
- doing next(new Error('foo')) will stall and end middleware chain

[node]
- process.nextTick()
    when you defined a function that return something, and takes in a callback,
    make sure you callback on the next event loop-around, so at that point you
    would return valid object, that callback might likely want to access/modify

    use this to be nice, similar to yield()? delay executation of callback until next loop-around

[code analysis]
# npm install -g jslint
$ jslint --sloppy --white <file.js>

[make a copy of an array]
var foo = [1, 2, 3];
var bar = foo.slice(0);

- an object that listen for event must be subclass of
  of events.EventEmitter, e.g. http.createServer()

  I'm an eventer, I will emit events, and have a list of
  who responds/listens to those, so we will see statements
  such eventer.on('foo', somehandler)

[modules]
- now.js and dnode--socket.io namespace (function/var sharing)

[mongodb]
$ mongo; show dbs; use nodejs1; show collections; db.getCollectionNames(), db.users.find(), db.users.remove(), db.users.drop()

[debug node]
$ node --debug-brk app.js
$ node-inspector &
http://0.0.0.0:8080/debug?port=5858

- __proto__ in node-inspector imples functions/methods of the 'this' object

[module.exports vs exports]
- if you want your module to be of a specific object type (boolean, string, etc),
  use module.exports; if you want your module to be a typical module instance, use exports
- result of attaching properties to module.exports is akin (same) to attaching properties to exports
- http://www.hacksparrow.com/node-js-exports-vs-module-exports.html