CreateNote() gets called....

//------------------------------------------

class NoteController {
    constructor() {
        this.store = new NoteStore();
    }

    CreateNote() {
        var title = $("#edtNoteTitle").val();

        if (title.length < 1) {
            this.CreateToast(false);
            return;
        } else if ($.inArray(title, this.store.notes.map(n => n.title)) >= 0) {
            this.CreateToast(false);
            return;
        }

        this.store.AddNote(new Note(title, $("#edtNoteText").val()), this.store);
        this.CreateToast(true);
    }

    CreateToast(isValid) {

    }
}

//------------------------------------------

class NoteStore {
    constructor() {
        this.notes = [];
    }

    AddNote(note) {
        this.notes.push(note);
    }
}

//------------------------------------------

class Note {
    constructor(noteTitle, noteText, noteStore) {
        this.title = noteTitle;
        this.text = noteText;
        this.store = noteStore;
    }
}