Add extension for converting dictionary keys

Sources/AppFoundations/Extensions/Dictionary/Dictionary+KeyConversion.swift

@@ -0,0 +1,26 @@
+//
+//  Dictionary+KeyConversion.swift
+//
+//
+//  Created by Mark DiFranco on 2023-10-21.
+//
+
+import Foundation
+
+public extension Dictionary {
+
+    /// Converts `self` into a new dictionary with a different type of key.
+    /// - parameter converter: The closure to use to convert the keys' types.
+    /// - returns: A new dictionary, with the new type as the key.
+    func convertKeys<NewKey>(_ converter: (Key) -> NewKey?) -> [NewKey : Value] {
+        var newDictionary = [NewKey : Value]()
+
+        keys.forEach { (key) in
+            if let newKey = converter(key) {
+                newDictionary[newKey] = self[key]
+            }
+        }
+
+        return newDictionary
+    }
+}