An object that appears and disappears mysteriously

TL;DR: Add the necessary indirection layers, but no more.

Problems

• Accidental complexity

• Readability

• YAGNI violation

Solutions

1. Remove the intermediate object

Context

A poltergeist (or gypsy wagon) is a short-lived object used to perform initialization or to invoke methods in another, more permanent class.

An object is responsible for many small tasks, resulting in excessive coupling and a lack of cohesion in the code.

Sample Code

Wrong

public class Driver
{
    private Car car;

    public Driver(Car car)
    {
        this.car = car;
    }

    public void DriveCar()
    {
        car.driveCar();
    }
}


Car porsche = new Car();
Driver homer = new Driver(porsche);
homer.DriveCar();

Right

Car porsche = new Car();

porsche.driveCar();
// We don't need the driver