const people = [
{ id: 1, name: 'Ada' },
{ id: 2, name: 'Brian' },
{ id: 1, name: 'Alan' },
{ id: 3, name: 'Grace' },
] as const;
const uniqueById = Arr.uniqBy(people, (person) => person.id);
const expected = [
{ id: 1, name: 'Ada' },
{ id: 2, name: 'Brian' },
{ id: 3, name: 'Grace' },
] as const;
assert.deepStrictEqual<readonly Readonly<{ id: number; name: string }>[]>(
uniqueById,
expected,
);
Creates a new array with unique elements based on a mapped value.