+ Ma is now Delegate

+ way to add pure Lyng parents when declaring kotlin bindings
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sergeych committed 2026-01-06 13:11:07 +01:00
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@@ -224,6 +224,19 @@ A delegate is any object that provides the following methods (all optional depen
- `invoke(thisRef, name, args...)`: Called when a delegated `fun` is invoked.
- `bind(name, access, thisRef)`: Called once during initialization to configure or validate the delegate.
### Map as a Delegate
Maps can also be used as delegates. When delegated to a property, the map uses the property name as the key:
```lyng
val settings = { "theme": "dark", "fontSize": 14 }
val theme by settings
var fontSize by settings
println(theme) // "dark"
fontSize = 16 // Updates settings["fontSize"]
```
For more details and advanced patterns (like `lazy`, `observable`, and shared stateless delegates), see the [Delegation Guide](delegation.md).
## Instance initialization: init block
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@@ -151,6 +151,24 @@ fun test() {
}
```
### 6. Map as a Delegate
Maps can be used as delegates for `val` and `var` properties. When a map is used as a delegate, it uses the property name as a key to read from or write to the map.
```lyng
val m = { "a": 1, "b": 2 }
val a by m
var b by m
println(a) // 1
println(b) // 2
b = 42
println(m["b"]) // 42
```
Because `Map` implements `getValue` and `setValue`, it works seamlessly with any object that needs to store its properties in a map (e.g., when implementing dynamic schemas or JSON-backed objects).
## The `bind` Hook
The `bind(name, access, thisRef)` method is called exactly once when the member is being initialized. It allows the delegate to: