Structs and methods

Focus: one Task struct and one method that returns an updated copy.

task_methods.slx


struct Task {
    id: u64,
    title: string,
    done: bool
}
 
fn (task Task) mark_done() -> Task {
    return Task {
        id: task.id,
        title: task.title,
        done: true
    }
}
 
entry complete_task(id: u64, title: string) -> Task {
    let task: Task = Task {
        id,
        title,
        done: false
    }
    return task.mark_done()
}

How it works

Task is the contract’s typed return value.
fn (task Task) mark_done() -> Task declares a method with task as the receiver.
complete_task(id, title) creates a new task with done: false.
task.mark_done() returns a new Task with the same id and title and done: true.