LoxInstance doesnt need a UUID; we can simply use the built in `Obj…

…ectIdentifier` for instances for hashing, and compare references for equality.

slox/LoxInstance.swift

@@ -5,8 +5,6 @@
 //  Created by Danielle Kefford on 3/4/24.
 //
 
-import Foundation
-
 class LoxInstance {
     // `klass` is what is used in the interpreter when we need
     // to know the class of a particular instance. Every Lox
@@ -26,14 +24,12 @@ class LoxInstance {
         return _klass!
     }
     var properties: [String: LoxValue] = [:]
-    var objectId: UUID
 
     /// - Parameter klass: The class this instance belongs to.
     /// Use `nil` if this instance *is* a class; the `klass` property
     /// will then instantiate a metaclass for it on demand.
     required init(klass: LoxClass?) {
         self._klass = klass
-        self.objectId = UUID()
     }
 
     func get(propertyName: String) throws -> LoxValue {

slox/LoxValue.swift

@@ -144,7 +144,7 @@ enum LoxValue: CustomStringConvertible, Equatable, Hashable {
         case (.instance(let leftDict as LoxDictionary), .instance(let rightDict as LoxDictionary)):
             return leftDict.kvPairs == rightDict.kvPairs
         case (.instance(let leftInstance), .instance(let rightInstance)):
-            return leftInstance.objectId == rightInstance.objectId
+            return leftInstance === rightInstance
         default:
             return false
         }
@@ -170,7 +170,7 @@ enum LoxValue: CustomStringConvertible, Equatable, Hashable {
         case .nativeFunction(let nativeFunction):
             hasher.combine(nativeFunction)
         case .instance(let instance):
-            hasher.combine(instance.objectId)
+            hasher.combine(ObjectIdentifier(instance))
         }
     }
 }