title: create a all but one item loop to apply effects
body: <p>I would like my swift code to make a kind of loop that all items follow except one stated by the user. So for example below, I listed 4 buttons and 1 objc functions linked with the buttons. In b1 hit I know I can just write </p>
  
  <p><code>b1.backgroundcolor =  blue and b2.backgroundcolor = green, b3.backgroundcolor = green</code>. Butt I wanted to see if I could do something like <code>[b1!,b2,b3].forEach{$0.backgroundcolor = .green.}</code></p>
  
  <pre><code>import UIKit
  
  class ViewController: UIViewController {
  
  var b1 = UIButton()
  var b2 = UIButton()
  var b3 = UIButton()
  
  override func viewDidLoad() {
      super.viewDidLoad()
      // Do any additional setup after loading the view.
  
      [b1,b3,b2].forEach{
          $0.translatesAutoresizingMaskIntoConstraints = false
          view.addSubview($0)
          $0.backgroundColor = .blue
      }
  
  
      b1.addTarget(self, action: #selector(b1Hit), for: .touchUpInside)
  
  }
  
  @objc func b1Hit(){
  
      change all buttons background color to green except b1
  
  }
  
  }
  </code></pre>