plusAssign
Appends or replaces all pairs from prefs to this MutablePreferences. Keys in prefs will overwrite keys in this Preferences.
Example usage: mutablePrefs += preferencesOf(COUNTER_KEY to 100, NAME to "abcdef")
Parameters
prefs
Preferences to append to this MutablePreferences
Appends or replaces all pair to this MutablePreferences.
Example usage: mutablePrefs += COUNTER_KEY to 100
Parameters
pair
the Preference.Pair to add to this MutablePreferences