notes.js

const fs = require('fs');

var fetchNotes = () => {
    try{
        var notesString = fs.readFileSync('notes-data.json');
        return JSON.parse(notesString);
    }catch(e){
        return [];
    }   
}

var saveNote = (notes) => {
    fs.writeFileSync('notes-data.json',JSON.stringify(notes));
}

var addNote = (title, body) => {
    notes = [];
    note = {
        title,
        body
    }

    notes = fetchNotes();

    var duplicateNotes = notes.filter((note) => note.title === title);

    if(duplicateNotes.length === 0){
    notes.push(note);
    saveNote(notes);
    return note;    
    }
}

var getAll = () => {
    return fetchNotes();
}

var getNote = (title) =>{
    var notes = fetchNotes();

    var filteredNotes = notes.filter((note) => note.title === title);
   
    return filteredNotes[0];
}

var removeNote = (title) => {
    var notes = fetchNotes();

    var filteredNotes = notes.filter((note) => note.title !== title);
        
    saveNote(filteredNotes);

    return notes.length !== filteredNotes.length;

}

    var logNote = (note) => {
        debugger;
        console.log('--');
        console.log(`Title: ${note.title}`);
        console.log(`Body: ${note.body}`);
    }

module.exports = {
    addNote,
    getAll,
    getNote,
    removeNote,
    logNote
}