I have an Array a
of Questions:
[
{id: 1,name: "Question 1"},
{id: 2,name: "Question 2"},
{id: 3,name: "Question 3"},
]
and an Array b
of Answers, where the property question_id
references the property id
of Array a
:
[
{id: 1, question_id: 2,name: "My Answer to Question 2"}
]
With lodash, I want to filter Array a
to exlude all the Answers that are referencing to it, expecting the output:
[
{id: 1,name: "Question 1"},
{id: 3,name: "Question 3"},
]
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;
}