damus

SequenceUtils.swift (415B)

---

 //
 //  SequenceUtils.swift
 //  damus
 //
 //  Created by Daniel D’Aquino on 2023-11-24.
 //
 
 import Foundation
 
 extension Sequence {
     func just_one() -> Element? {
         var got_one = false
         var the_x: Element? = nil
         for x in self {
             guard !got_one else {
                 return nil
             }
             the_x = x
             got_one = true
         }
         return the_x
     }
 }