splice.ts

const userToRemoveIndex = this.users.indexOf(user);
 
this.users = this.users.filter((_, index) => {
  return index !== userToRemoveIndex;
}); // BAD
 
this.users = [
  ...this.users.slice(0, userToRemoveIndex),
  ...this.users.slice(userToRemoveIndex + 1)
]; // BAD
 
const users = this.users.slice();
users.splice(userToRemoveIndex, 1);
this.users = users; // GOOD, we also change the reference