1 files changed, 8 insertions, 1 deletions
diff --git a/aoc-2020-gleam/src/ext/iteratorx.gleam b/aoc-2020-gleam/src/ext/iteratorx.gleam
index 65e06f2..4e184bd 100644
--- a/aoc-2020-gleam/src/ext/iteratorx.gleam
+++ b/aoc-2020-gleam/src/ext/iteratorx.gleam
@@ -1,4 +1,4 @@
-import gleam/iterator.{Iterator} as iter
+import gleam/iterator.{Iterator, Next} as iter
 
 pub fn length(iterator: Iterator(a)) -> Int {
   iterator
@@ -23,3 +23,10 @@ pub fn filter_map(
     }
   })
 }
+
+pub fn unfold_infinitely(from state: a, with fun: fn(a) -> a) -> Iterator(a) {
+  iter.unfold(
+    from: state,
+    with: fn(s) { Next(element: s, accumulator: fun(s)) },
+  )
+}