Add list.isEmpty(), .lastIndex()

packages_v5/example.candy

@@ -116,6 +116,7 @@ struct List[T] = builtin
 fun listFilled[T](length: Int, item: T) List[T] {
   builtinListFilled(length, item)
 }
+# TODO: listGenerate(…)
 fun listOf[T]() List[T] {
   builtinListOf[T]()
 }
@@ -137,6 +138,15 @@ fun listOf[T](item0: T, item1: T, item2: T, item3: T, item4: T) List[T] {
 fun length[T](list: List[T]) Int {
   builtinListLength(list)
 }
+fun isEmpty[T](list: List[T]) Bool {
+  list.length().equals(0)
+}
+fun lastIndex[T](list: List[T]) Maybe[Int] {
+  switch list.isEmpty() {
+    true => none[Int](),
+    false => some(list.length().subtract(1)),
+  }
+}
 fun get[T](list: List[T], index: Int) Maybe[T] {
   builtinListGet(list, index)
 }
@@ -164,11 +174,11 @@ fun append[T](list: List[T], item: T) List[T] {
 fun replace[T](list: List[T], index: Int, item: T) List[T] {
   builtinListReplace(list, index, item)
 }
-# TODO: list.update
+# TODO: list.update(…)
 fun removeAt[T](list: List[T], index: Int) List[T] {
   builtinListRemoveAt(list, index)
 }
-
+# TODO: list.getRange(…), .concatenate(…), .firstIndexWhere(…), .firstWhere(…), .firstIndexOf(…), .lastIndexWhere(…), .lastWhere(…), .lastIndexOf(…)
 fun print[T: ToText](t: T) {
   builtinPrint(t.toText())
 }