GODOT 3 to 4 Example: Changes between file opening, file saving, export and setget, & use of JSON

# Some samples of changes in reading and writing files and converting JSON #


#############
#### 3.5 #### (Any line with ###### at the end will be different in the 4.0 version)
#############

export var dbpath : String = DBFolder + DefaultDB setget set_dbpath ######

func check_for_settings_file(verbose : bool = false) -> bool:
    var got_it = File.new().file_exists(SettingsPath) ######
    if verbose: print(got_it)
    return got_it


func load_settings(verbose : bool = false):
    if !check_for_settings_file():
        if verbose: print("Settings.gd, load_settings || Settings file missing! Creating new settings file from default settings.")
        settings = DefaultSettings
        save_settings()
    else:
        if verbose: print("Settings.gd, load_settings || Settings file found!")
        var source = File.new() ######
        source.open(SettingsPath, File.READ) ######
        settings = JSON.parse(source.get_as_text()).result ######
        source.close() ######
        if verbose: print("Settings.gd, load_settings || settings: \n" + str(settings))


func save_settings(verbose : bool = false):
    var new_file = File.new() ######
    new_file.open(SettingsPath, File.WRITE) ######
    new_file.store_string(to_json(settings)) ######
    new_file.close()
    if verbose: print("Settings.gd, save_settings || Settings file saved.")


#############
#### 4.0 ####
#############

@export var dbpath : String = DBFolder + DefaultDB : set = set_dbpath

func check_for_settings_file(verbose : bool = false) -> bool:
    var got_it = FileAccess.file_exists(SettingsPath)
    if verbose: print(got_it)
    return got_it


func load_settings(verbose : bool = false):
    if !check_for_settings_file():
        if verbose: print("Settings.gd, load_settings || Settings file missing! Creating new settings file from default settings.")
        settings = DefaultSettings
        save_settings()
    else:
        if verbose: print("Settings.gd, load_settings || Settings file found!")
        var source = FileAccess.open(SettingsPath, FileAccess.READ).get_as_text()
        settings = JSON.new().parse_string(source)
        if verbose: print("Settings.gd, load_settings || settings: \n" + str(settings))


func save_settings(verbose : bool = false):
    var new_file = FileAccess.open(SettingsPath, FileAccess.WRITE)
    new_file.store_string(JSON.new().stringify(settings))
    new_file.close()
    if verbose: print("Settings.gd, save_settings || Settings file saved.")