Finish day 3

1 files changed, 14 insertions, 0 deletions

diff --git a/aoc-2020-gleam/src/ext/iteratorx.gleam b/aoc-2020-gleam/src/ext/iteratorx.gleam
new file mode 100644
index 0000000..456c1d1
--- /dev/null
+++ b/aoc-2020-gleam/src/ext/iteratorx.gleam
@@ -0,0 +1,14 @@
+import gleam/iterator.{Iterator} as iter
+import gleam/list
+
+pub fn length(iterator: Iterator(a)) -> Int {
+  iterator
+  |> iter.to_list
+  |> list.length
+}
+
+pub fn count(iterator: Iterator(a), satisfying predicate: fn(a) -> Bool) -> Int {
+  iterator
+  |> iter.filter(for: predicate)
+  |> length
+}