aciidgh

extension String {
   
    func trimBackTo(boundary: Character) -> String {
        if isEmpty {return ""}
        if self[endIndex.predecessor()] == boundary { return "" }
        return characters.split(boundary).map(String.init).last!
    }
    
    func trimUpTo(boundary: Character) -> String {
        if isEmpty { return "" }

aciidgh

//: Playground - noun: a place where people can play

import UIKit
import XCPlayground

class VC: UIViewController {
    let newView = UIView()
    
    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)