Filter nested array in object array by array of values

Question

Considering below object array:

[
    {
        \"guid\": \"j5Dc9Z\",            
        \"courses\": [
            {
                \"id\": 1,
                    


        

Answer 1

try this,

results = [
        {
            "guid": "j5Dc9Z",            
            "courses": [
                {
                    "id": 3,
                    "name": "foo",                    
                }
            ]
        },
        {
            "guid": "a5gdfS",
            "courses": [
                {
                    "id": 1,
                    "name": "bar",                    
                },
                {
                    "id": 3,
                    "name": "foo",                    
                },    
            ]
         } 
    ]

var filter = [1]
console.log(results.map(result=>{
      result.courses = result.courses.filter(course=>(filter.includes(course.id)))
      return result
    }))

Answer 2

If you're trying to filter the elements whose course IDs contain in the filter.courses, you may use Array#every and Array#includes to do that:

const data = [{"guid":"j5Dc9Z","courses":[{"id":3,"name":"foo"}]},{"guid":"a5gdfS","courses":[{"id":1,"name":"bar"},{"id":3,"name":"foo"}]},{"guid":"jHab6i","courses":[{"id":7,"name":"foobar"}]}];
const courses = [1, 6, 3];

const r = data.filter(d => d.courses.every(c => courses.includes(c.id)));
console.log(r);