You could take a hash table and get the values of it.
This approach takes the last found object with the same id.
const
array = [{ id: 1, title: 'first' }, { id: 2, title: 'test2' }, { id: 1, title: 'last' }],
unique = Object.values(array.reduce((r, o) => (r[o.id] = o, r), {}));
console.log(unique);By using a Set with a closure, you could filter the array.
This approach takes the first found object with the same id.
const
array = [{ id: 1, title: 'first' }, { id: 2, title: 'test2' }, { id: 1, title: 'last' }],
unique = array.filter((s => ({ id }) => !s.has(id) && s.add(id))(new Set));
console.log(unique);CLICK HERE to find out more related problems solutions.