chore: doc

website/docs/guides/miscellaneous/dart-code.md

@@ -0,0 +1,25 @@
+# Extra Dart code
+
+Arbitrary extra Dart code can be inserted into auto-generated Dart classes.
+
+## Example
+
+```rust
+#[frb(dart_code = "
+    int extraMethod() => a * 2;
+"
+)]
+pub struct MyStruct {
+    ...
+}
+```
+
+Then the generated Dart class will look like:
+
+```dart
+class MyStruct {
+  ... // other auto-generated code
+  
+  int extraMethod() => a * 2; // The extra code
+}
+```

website/docs/guides/miscellaneous/eq-hash.md

@@ -0,0 +1,15 @@
+# Equals and Hash
+
+This page discusses the `operator==` (equals) and `hashCode` of the automatically generated Dart class.
+
+## Default
+
+The default for non-`freezed` classes is field-by-field comparison.
+You can use `#[frb(non_hash, non_eq)]` to disable such generated code.
+
+The default for `freezed` classes: Usually field-by-field comparison (see `freezed`'s doc for more details).
+
+## Custom (arbitrary)
+
+Arbitrary equals/hash function can also be implemented by using the [extra Dart code](dart-code) feature.
+For example, `#[frb(dart_code = "int get hashCode { arbitrary_code_calling_whatever_Rust_and_Dart_things }")]`.

website/sidebars.js

@@ -182,6 +182,8 @@ const sidebars = {
                         'guides/miscellaneous/callables',
                         'guides/miscellaneous/properties',
                         'guides/miscellaneous/constructors',
+                        'guides/miscellaneous/dart-code',
+                        'guides/miscellaneous/eq-hash',
                         'guides/miscellaneous/codec',
                         'guides/miscellaneous/build-rs',
                         'guides/miscellaneous/expanding-macros',