/// <summary>
/// Use a different vocabulary set
/// </summary>
/// <param name="vocabularySet">New <see cref="VocabularySet"/> to use.</param>
public WordTutorApplication WithVocabularySet(VocabularySet vocabularySet)
{
if (ReferenceEquals(VocabularySet, vocabularySet))
{
return(this);
}
return(new WordTutorApplication(
this,
vocabularySet: vocabularySet ?? throw new ArgumentNullException(nameof(vocabularySet))));
}
public static VocabularySet Add(this VocabularySet vocabulary, params VocabularyWord[] words) => words.Aggregate(
