The filesystem is an often overlooked database engine. While filesystems don't have the sort of query features supported by database engines, they are a reliable place to store files. The notes schema is simple enough that the filesystem can easily serve as its data storage layer.
Let's start by adding a function to Note.js:
get JSON() {
return JSON.stringify({
key: this.key, title: this.title, body: this.body
});
}This is a getter, which means note.JSON (no parenthesis) will simply give us the JSON representation. We'll use this later for writing to JSON files.
Take a peek at the static function mentioned in the following code:
static fromJSON(json) {
var data = JSON.parse(json);
var note = new Note(data.key, data.title, data.body);
return note;
}This is a static function to aid in constructing Note objects if we have a JSON string. In other words, fromJSON is a factory method. The difference is that JSON is associated with an instance...