Computed Properties

A computed property is a read only method which can be extruded like a value. You can think of it like a C# get-only property.

Computed properties are public by default but can be annotated with :private to make them only visible inside the defining template. They cannot be used with a from mapping but do have access to any top level field declaration.

template ComputedPropertyExample {
    
    state int x;
    state int y;
    
    computed int sum => x + y;
    
    // only visible inside this template's definition
    computed:private int product => x + y;
    
}

template UsingAComputedProperty render {
    
    // a computed property can be extruded with the [] operator
    ComputedPropertyExample() [sum]
    
    Text($"x + y is {sum}");
    
}