How can I perform an inner join with two object arrays in JavaScript?

Question

I have two object arrays:

var a = [
  {id: 4, name: \'Greg\'},
  {id: 1, name: \'David\'},
  {id: 2, name: \'John\'},
  {id: 3, name: \'Matt\'},
]

var b = [         


        

Answer 1

If you drop the null criteria (many in the community are saying using null is bad) then there's a very simple solution

let a = [1, 2, 3];
let b = [2, 3, 4];

a.filter(x => b.includes(x)) 

// [2, 3]