Label for nullable

3 files changed, 5 insertions, 6 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2f615d7..9549e20 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,7 @@
   `thoas` Erlang JSON library.
 - The `encode` function has been replaced by `to_string` and `to_string_builder`
   functions.
+- The `nullable` function gains argument labels.
 
 ## v0.1.0 - 2020-07-30
 
diff --git a/src/gleam/json.gleam b/src/gleam/json.gleam
index b509d7c..dcaf02e 100644
--- a/src/gleam/json.gleam
+++ b/src/gleam/json.gleam
@@ -47,11 +47,9 @@ pub external fn null() -> Json =
   "thoas_encode" "null"
 
 // TODO: document
-// TODO: test
-// TODO: change argument order
-pub fn nullable(input: Option(a), inner: fn(a) -> Json) -> Json {
+pub fn nullable(input: Option(a), the inner_type: fn(a) -> Json) -> Json {
   case input {
-    Some(value) -> inner(value)
+    Some(value) -> inner_type(value)
     None -> null()
   }
 }
diff --git a/test/gleam_json_test.gleam b/test/gleam_json_test.gleam
index 7617ebb..dae51b6 100644
--- a/test/gleam_json_test.gleam
+++ b/test/gleam_json_test.gleam
@@ -47,12 +47,12 @@ pub fn encode_list_test() {
 }
 
 pub fn encode_nullable_some_test() {
-  json.nullable(Some(5), json.int)
+  json.nullable(Some(5), the: json.int)
   |> should_encode("5")
 }
 
 pub fn encode_nullable_none_test() {
-  json.nullable(None, json.int)
+  json.nullable(None, the: json.int)
   |> should_encode("null")
 }