1 files changed, 92 insertions, 2 deletions
diff --git a/src/iodata.gleam b/src/iodata.gleam
index 2d14ed0..cc54965 100644
--- a/src/iodata.gleam
+++ b/src/iodata.gleam
@@ -8,7 +8,10 @@ pub external fn prepend(Iodata, String) -> Iodata =
 pub external fn append(Iodata, String) -> Iodata =
   "gleam__stdlib" "iodata_append";
 
-pub external fn from(List(String)) -> Iodata =
+pub external fn concat(List(String)) -> Iodata =
+  "gleam__stdlib" "identity";
+
+pub external fn new(String) -> Iodata =
   "gleam__stdlib" "identity";
 
 pub external fn to_string(Iodata) -> String =
@@ -18,7 +21,7 @@ pub external fn byte_size(Iodata) -> Int =
   "erlang" "iolist_size";
 
 test iodata {
-  let iodata = from(["ello"])
+  let iodata = new("ello")
     |> append(_, ",")
     |> append(_, " world!")
     |> prepend(_, "H")
@@ -31,3 +34,90 @@ test iodata {
   |> byte_size
   |> expect:equal(_, 13)
 }
+
+pub external fn lowercase(Iodata) -> Iodata = "string" "lowercase"
+
+test lowercase {
+  ["Gleam", "Gleam"]
+  |> concat
+  |> lowercase
+  |> to_string
+  |> expect:equal(_, "gleamgleam")
+}
+
+pub external fn uppercase(Iodata) -> Iodata = "string" "uppercase"
+
+test uppercase {
+  ["Gleam", "Gleam"]
+  |> concat
+  |> uppercase
+  |> to_string
+  |> expect:equal(_, "GLEAMGLEAM")
+}
+
+pub external fn reverse(Iodata) -> Iodata = "string" "reverse"
+
+enum Direction =
+  | All
+
+external fn erl_split(Iodata, String, Direction) -> List(Iodata) =
+  "string" "split"
+
+pub fn split(iodata, on) {
+  erl_split(iodata, on, All)
+}
+
+test split {
+  "Gleam,Erlang,Elixir"
+  |> new
+  |> split(_, ",")
+  |> expect:equal(_, [new("Gleam"), new("Erlang"), new("Elixir")])
+
+  ["Gleam, Erl", "ang,Elixir"]
+  |> concat
+  |> split(_, ", ")
+  |> expect:equal(_, [new("Gleam"), concat(["Erl", "ang,Elixir"])])
+}
+
+external fn erl_replace(Iodata, String, String, Direction) -> Iodata =
+  "string" "replace"
+
+pub fn replace(iodata, pattern, replacement) {
+  erl_replace(iodata, pattern, replacement, All)
+}
+
+pub external fn is_equal(Iodata, Iodata) -> Bool = "string" "equal"
+
+test is_equal {
+  new("12")
+  |> is_equal(_, concat(["1", "2"]))
+  |> expect:true
+
+  new("12")
+  |> is_equal(_, new("12"))
+  |> expect:true
+
+  new("12")
+  |> is_equal(_, new("2"))
+  |> expect:false
+}
+
+pub external fn is_empty(Iodata) -> Bool = "string" "is_empty"
+
+test is_empty {
+  new("")
+  |> is_empty
+  |> expect:true
+
+  new("12")
+  |> is_empty
+  |> expect:false
+
+  concat([])
+  |> is_empty
+  |> expect:true
+
+  concat(["", ""])
+  |> is_empty
+  |> expect:true
+}