lodash：陣列濾波器和對象

Question

排除我有一個Array a的問題：

[ 
    {id: 1,name: "Question 1"}, 
    {id: 2,name: "Question 2"}, 
    {id: 3,name: "Question 3"}, 
] 

和一個Array b問答，其屬性question_id引用idArray a的屬性：

​​

用lodash，我想過濾Array a排除所有的個答案被引用到它，期望輸出：

[ 
    {id: 1,name: "Question 1"}, 
    {id: 3,name: "Question 3"}, 
] 

Answer 1

var questions = [ 
    {id: 1,name: "Question 1"}, 
    {id: 2,name: "Question 2"}, 
    {id: 3,name: "Question 3"}, 
]; 

var answers = [ 
    {id: 1, question_id: 2,name: "My Answer to Question 2"} 
]; 

var filtered = _.filter(questions, isNotReferencedByAnyAnswer); 

function isNotReferencedByAnyAnswer(question) { 
    return _.findIndex(answers, {'question_id': question.id}) === -1; 
}