Comparing two GameObjects to pick up items

Im trying to create a script for my 2d game, while hovering over the item, select it so that it then can be used, i found some code over the internet which relates closely to picking up a weapon but im having trouble following it how would you go about a weapon pick up

 if(selectedWeapon && Input.GetButtonDown("pickup")){
     for (var i : int=0 ;i<playerWeapons.weapons.length; i++){
         if(playerWeapons.weapons[i] == selectedWeapon.GetComponent(SelectableWeapon).weapon)
             return;
     }

Im doing my work in c# rather than java script and when i try to type this code out i get an error at where it would say getComponent().weapon(becuase it would be impossible for the compiler to know that selectedweapon has a variable of type weapon :S?), from what i understand, the code essentially asks whether the two gameobjects are the same. So in that case do i have to compare it in this way, can i not just refer to the tag of the object. Or is it more a case that selectedWeapon (in my case selectedTool) will have to be a custom class of some sort here is my code for. I'm literally a month in learning unity so this is pretty new, if there is any other way of doing this im open to any suggestions

 using UnityEngine;
 using System.Collections;
 
 public class SelectTool : MonoBehaviour {
     
     public Tools tools;
     public float startTime;
     public bool ScalpalSelected;
     public GameObject selectedTool;
     
     void Start()
     {
         tools = this.GetComponent<Tools>(); //in order to use this tools muyst be attached to the game object
         //this is essentially saying  with regards to this game object get the component named tools
     }
     void update()
     {
         /*this script will be attached to the cursor
          * essentially what could be done is to
          * 
          * 
          * 
          * 
          */ 
     }
     void OnCollisionStay(Collision Other)
     {
         startTime +=Time.deltaTime;
         
         if(startTime >5f){
             if(Other.collider.tag==("Scalpal"))
             {
                 selectedTool = Other.collider.gameObject;
                 Debug.Log(selectedTool+" What in gods good name is:");
                 //this essential creates a scalpal object out of selected tool
             }
             else {
                 selectedTool=null;
             }
             if(selectedTool){
                 for(int i=0;i<tools.utilities.Length;i++)
                 {
                     if(tools.utilities[i]==selectedTool.GetComponent(SelectableUtils).tool)
                         return;
                 }    
             }
     
             
                 ScalpalSelected=true;
                 renderer.material.color = Color.yellow;    
         }
     }
     void OncollisionStay(Collision other){
     
         startTime = 0f;
     }
     
 }