String slice tco (#338)

1 files changed, 7 insertions, 2 deletions

diff --git a/src/gleam/string.gleam b/src/gleam/string.gleam
index 1645894..9c1bc9e 100644
--- a/src/gleam/string.gleam
+++ b/src/gleam/string.gleam
@@ -710,9 +710,14 @@ if javascript {
 /// ```
 ///
 pub fn to_graphemes(string: String) -> List(String) {
+  do_to_graphemes(string, [])
+  |> list.reverse
+}
+
+pub fn do_to_graphemes(string: String, acc: List(String)) -> List(String) {
   case pop_grapheme(string) {
-    Ok(#(grapheme, rest)) -> [grapheme, ..to_graphemes(rest)]
-    _ -> []
+    Ok(#(grapheme, rest)) -> do_to_graphemes(rest, [grapheme, ..acc])
+    _ -> acc
   }
 }