So far our chat server has only been receiving messages when other people are online. Wouldn't it be nice if we could add persistence to our p2p chat system so you would receive messages from your friends even though you were not online when they sent it?
Luckily there is a really great small database for node called LevelDB. The best thing about LevelDB is that it does very few things! It is a small key value store that runs inside your process and persists to disk.
You can use by installing the level module from npm
npm install level
You can read the documentation for leveldb here, https://github.com/level/levelup
To complete this excercise you should make two new programs.
The first one, put.js should put the value world into the key hello and store it
in a leveldb called test.db.
The other one, get.js should get the key hello from the same leveldb and print it out
To create a new levelup do var db = level(dbName), to put a key/value pair you can do
db.put(key, value, callback) and to get a key you can do db.get(key, callback)
To test if your solution is corrent first run
node put.js
and then
node get.js
If you inserted the value correctly get.js should print out world
When you are done click here to go to the next exercise