UI Button Swap Objects

Hi,
For my first project on Unity I’m trying to implement a UI Button that swap between different object model.
I’ve found some old coding used for cycling objects and tried to use it on my own but i can’t quite understand what i’m missing.
Here is a copy of the script i wrote using System.Collections;using System.Collections.Generic;
using UnityEngine;

public partial class Activate : MonoBehaviour {

public static bool viewCube;
public static bool viewCylinder;
public static bool viewSphere;
private int itemSelector;
private int objectCount;

`void Start() {
    itemSelector = 1;
}

void Update() {
    Debug.Log(itemSelector);
    Debug.Log(viewCube);
    Debug.Log(viewCylinder);
    Debug.Log(viewSphere);

    ViewableObjects = FindObjectOfType(typeof(scriptaray)) as scriptaray[];
    objectCount = new ViewableObjects;

    if (Input.GetButtonDown)
    {= "Button") }

    {
        itemSelector -= 1;
    }
    if (itemSelector >= 4)
    {
        itemSelector = 1;
    }

    if (itemSelector <= 0)
    {
        itemSelector = 3;
    }
    if (itemSelector == 1)
    {
        viewCube = true;
    }
    else {
        viewCube = false;
    }
    if (itemSelector == 2)
    {
        viewCylinder = true;
    }
    else {
        viewCylinder = false;
    }
    if (itemSelector == 3)  {
        viewSphere = true;  }
    else  {
        viewSphere = false; }

    for (int = 0; int < objectCount; int++)
    {
        if (viewCube)  {
            if (ViewableObjects.gameObject.tag == "cube")
            {
                ViewableObjects.gameObject.setActive.enabled = true;
            }
            else   {
                ViewableObjects.gameObject.render.enabled = false;
            }
        }

        if (viewCylinder) {
            if (ViewableObjects.gameObject.renderer.tag == "Cylinder")
            {
                ViewableObjects.gameObject.renderer.enabled = true;
            }
            else {
                ViewableObjects.gameObject.renderer.enabled = false;
            }
        }

        if (viewSphere) {
            if (ViewableObjects.gameObject.renderer.tag == "Sphere")
            {
                ViewableObjects.gameObject.renderer.enabled = true;
            }
            else {
                ViewableObjects.gameObject.renderer.enabled = false;
            }
        }

    }
}

} `

I really appreciate any help you can provide.

There are a lot of things wrong with this script.

In this line, you attempt to assign an object of type ViewableObjects to a variable of type int. You also don’t construct your instance of ViewableObjects correctly.

objectCount = new ViewableObjects;

This bit just won’t parse at all:

if (Input.GetButtonDown)
     {= "Button") }
     {

There are a lot of basic C# errors. That is, problems that would be problems if you were just writing an algorithm in Visual Studio; they aren’t Unity specific, near as I can tell. You might want to go use a tool like HackerRank to help walk you through the language and get you past these kinds of problems.