From 09e2c7ee3950b0fa22d9ca1b1b68d71cc811d018 Mon Sep 17 00:00:00 2001
From: Gioele Bucci <gioelebucci@gmail.com>
Date: Tue, 28 May 2024 23:30:33 +0200
Subject: Fix infinite recursion loop in `list.window` when `by` is 0

The function would enter an endless loop if 0 was passed as second argument, for e.g
`list.window([1, 2], 0) // endless loop!`
---
 src/gleam/list.gleam | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'src')

diff --git a/src/gleam/list.gleam b/src/gleam/list.gleam
index e782b45..83870b4 100644
--- a/src/gleam/list.gleam
+++ b/src/gleam/list.gleam
@@ -1913,8 +1913,10 @@ fn do_window(acc: List(List(a)), l: List(a), n: Int) -> List(List(a)) {
 /// ```
 ///
 pub fn window(l: List(a), by n: Int) -> List(List(a)) {
-  do_window([], l, n)
-  |> reverse
+  case n <= 0 {
+    True -> []
+    False -> do_window([], l, n) |> reverse
+  }
 }
 
 /// Returns a list of tuples containing two contiguous elements.
-- 
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