trail-into-darkness/Packages/com.jovian.utilties/Runtime/GameObjectUtilities.cs

using System;
using UnityEngine;
using Object = UnityEngine.Object;

namespace Jovian.Utilities {
    public static class GameObjectUtilities {
        public static void DestroyGameObjectsOfType<T>() where T : MonoBehaviour {
            T[] objects = Object.FindObjectsOfType<T>();
            for (int i = 0; i < objects.Length; ++i) {
                Object.Destroy(objects[i].gameObject);
            }
        }

        public static bool IsGameObjectAChildOfGameObject(this GameObject targetGameObject, GameObject potentialParentGameObject) {
            if (targetGameObject == null) {
                return false;
            }

            Transform potentialParentTransform = potentialParentGameObject.transform;
            Transform checkTransform = targetGameObject.transform;
            do {
                if (checkTransform == potentialParentTransform) {
                    return true;
                }

                checkTransform = checkTransform.parent;
            } while (checkTransform != null);

            return false;
        }

        public static bool TryFindChildByName(this GameObject gameObject,
            string name,
            out GameObject childGameObject,
            bool includeInactive = false,
            bool allowPartialMatch = false,
            StringComparison stringComparison = StringComparison.Ordinal) {
            childGameObject = null;
            if (gameObject == null) {
                return false;
            }

            Transform[] children = gameObject.GetComponentsInChildren<Transform>(includeInactive);
            foreach (Transform child in children) {
                if (allowPartialMatch && child.name.Contains(name, stringComparison)) {
                    childGameObject = child.gameObject;
                    return true;
                }

                if (!allowPartialMatch && child.name.Equals(name, stringComparison)) {
                    childGameObject = child.gameObject;
                    return true;
                }
            }

            return false;
        }
    }
}