named tuple toMap extension method

library/src/scala/NamedTuple.scala

@@ -1,5 +1,7 @@
 package scala
 import compiletime.ops.boolean.*
+import compiletime.summonAll
+import collection.immutable.ListMap
 
 import language.experimental.captureChecking
 
@@ -30,7 +32,7 @@ object NamedTuple:
   import NamedTupleDecomposition.{Names, DropNames}
   export NamedTupleDecomposition.{
     Names, DropNames,
-    apply, size, init, head, last, tail, take, drop, splitAt, ++, map, reverse, zip, toList, toArray, toIArray
+    apply, size, init, head, last, tail, take, drop, splitAt, ++, map, reverse, zip, toList, toArray, toIArray, toListMap
   }
 
   extension [N <: Tuple, V <: Tuple](x: NamedTuple[N, V])
@@ -209,6 +211,12 @@ object NamedTupleDecomposition:
     /** An immutable array consisting of all element values */
     inline def toIArray: IArray[Object] = x.toTuple.toIArray
 
+    /** An immutable map consisting of all element values preserving an order of fields.
+     *  Keys are the names of the elements.
+     */
+    inline def toListMap: ListMap[String, Tuple.Union[V]] =
+      inline compiletime.constValueTuple[N].toList match
+        case names: List[String] => ListMap.from(names.zip(x.toList))
   end extension
 
   /** The names of a named tuple, represented as a tuple of literal string values. */

tests/run/named-tuple-ops.scala

@@ -1,5 +1,6 @@
 //> using options -source future
 import scala.compiletime.asMatchable
+import scala.collection.immutable.ListMap
 
 type City = (name: String, zip: Int, pop: Int)
 type Raw = (String, Int, Int)
@@ -82,7 +83,10 @@ type Labels = (x: String, y: String)
   val _: List[String | Int] = cityFields
   assert(cityFields == List("Lausanne", 1000, 140000))
 
-  val citArr = city.toArray
-  val _: List[String | Int] = cityFields
-  assert(cityFields == List("Lausanne", 1000, 140000))
+  val cityArr = city.toArray
+  val _: Array[Object] = cityArr
+  assert(cityArr.sameElements(Array("Lausanne", 1000, 140000)))
 
+  val cityMap = city.toListMap
+  val _: ListMap[String, String | Int] = cityMap
+  assert(cityMap == ListMap("name" -> "Lausanne", "zip" -> 1000, "pop" -> 140000))