From 0a087d5d80b803e70909848f5b7b28ce2b5df4fc Mon Sep 17 00:00:00 2001
From: Richard Viney <richard.viney@gmail.com>
Date: Mon, 7 Oct 2024 17:40:31 +1300
Subject: Optimise string.repeat

---
 src/gleam/string.gleam | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/gleam/string.gleam b/src/gleam/string.gleam
index e530c8f..0906481 100644
--- a/src/gleam/string.gleam
+++ b/src/gleam/string.gleam
@@ -438,10 +438,14 @@ pub fn concat(strings: List(String)) -> String {
 /// ```
 ///
 pub fn repeat(string: String, times times: Int) -> String {
-  iterator.repeat(string)
-  |> iterator.take(times)
-  |> iterator.to_list
-  |> concat
+  do_repeat(string, times, "")
+}
+
+fn do_repeat(string: String, times: Int, acc: String) -> String {
+  case times <= 0 {
+    True -> acc
+    False -> do_repeat(string, times - 1, acc <> string)
+  }
 }
 
 /// Joins many `String`s together with a given separator.
-- 
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