【Unity】【Tips】拡張メソッドを定義してCollision2DのGetComponentを短く記述する

Before

private void OnCollisionEnter2D( Collision2D other )
{
    var rigidBody = other.gameObject.GetComponent<Rigidbody2D>();
}

After

public static class Collision2DExtensions
{
    public static T GetComponent<T>( this Collision2D self )
    {
        return self.gameObject.GetComponent<T>();
    }
}

private void OnCollisionEnter2D( Collision2D other )
{
    var rigidBody = other.GetComponent<Rigidbody2D>();
}