Filter array of objects by array of ids

Question

I have an array activeIds of ids of services and there is another array servicesList which contains objects of services.

Example: -

activeIds = [202, 204] serviceList = [{                   "id":201,                 "title":"a"                },                {                   "id":202,                 "title":"a"                },                {                   "id":203,                 "title":"c"                },                {                   "id":204,                 "title":"d"                },                {                   "id":205,                 "title":"e"                }]; 

I want all the services(obj) whose ids are not a part of the first array i.e., activeIds. From the above example code I want service obj of ids 201,203,205

Final output -

expectedArray = [{                   "id":201,                 "title":"a"                },                {                   "id":203,                 "title":"c"                },                {                   "id":205,                 "title":"e"                }]; 

Here is my attempt to code. But it is not correct at all. Please help-

    const activeIds = e; // [202, 204]     const obj = [];     this.serviceList.map((s: IService) => {         activeIds.map((id: number) => {             if (id !== s.id) {                 obj.push(s);             }         });     }); 

Answer 1

You can simply use array.filter with indexOf to check the matching element in the next array.

var arr = serviceList.filter(item => activeIds.indexOf(item.id) === -1); 

DEMO

let activeIds = [202, 204] let serviceList = [{                   "id":201,                 "title":"a"                },                {                   "id":202,                 "title":"a"                },                {                   "id":203,                 "title":"c"                },                {                   "id":204,                 "title":"d"                },                {                   "id":205,                 "title":"e"                }];   let  arr = serviceList.filter(function(item){       return activeIds.indexOf(item.id) === -1;     });      console.log(arr);