JS decode field for objects

1 files changed, 8 insertions, 0 deletions

diff --git a/src/gleam_stdlib.js b/src/gleam_stdlib.js
index 37f071a..b7173c2 100644
--- a/src/gleam_stdlib.js
+++ b/src/gleam_stdlib.js
@@ -473,6 +473,8 @@ export function decode64(sBase64) {
 export function classify_dynamic(data) {
   if (typeof data === "string") {
     return "String";
+  } else if (Result.isResult(data)) {
+    return "Result";
   } else if (List.isList(data)) {
     return "List";
   } else if (Number.isInteger(data)) {
@@ -552,3 +554,9 @@ export function decode_option(data, decoder) {
     return result;
   }
 }
+
+export function decode_field(value, name) {
+  return name in value
+    ? new Ok(value[name])
+    : decoder_error(`Value with field ${inspect(name)}`, value);
+}