GameObjectExtensions.cs

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namespace UnityEngine
{
    public static class GameObjectExtensions
    {
        public static T GetComponentRequired<T>(this GameObject self) where T : Component
        {
            T component = self.GetComponent<T>();
 
            if (component == null) Debug.LogError("Could not find " + typeof(T) + " on " + self.name);
 
            return component;
        }
 
        public static void SetLayerRecursively(this GameObject self, int newLayer)
        {
            if (null == self)
            {
                return;
            }
 
            self.layer = newLayer;
 
            foreach (Transform child in self.transform)
            {
                if (null == child)
                {
                    continue;
                }
                SetLayerRecursively(child.gameObject, newLayer);
            }
        }
    }
}