fn main() {
	types := ['game', 'web', 'tools', 'GUI']
	for typ in types {
		println('Hello, $typ developers!')
	}
}	

struct Story {
    title string
}

// Fetches top HN stories in 8 coroutines 
fn main() {
    resp := http.get('https://hacker-news.firebaseio.com/v0/topstories.json')?
    ids := json.decode([]int, resp.body)?
    mut cursor := 0
    for _ in 0..8 {
        go fn() {
            for  {
                lock { // Without this lock the program will not compile 
                    if cursor >= ids.len {
                        break
                    }
                    id := ids[cursor]
                    cursor++
                }
                resp := http.get('https://hacker-news.firebaseio.com/v0/item/$id.json')? 
                story := json.decode(Story, resp.body)?
                println(story.title)
            }
        }()
    }
    runtime.wait() // Waits for all coroutines to finish 
} 

import ui  // Native cross platform ui toolkit (uses Cocoa, win32, GTK+)  

// There are no globals, so we have to use a context struct 
struct Context {
    input ui.TextBox // this uses native conrols (NSTextView on macOS, edit HWND on Windows)  
    names []string   // let's log the names to demonstrate how arrays work  
}

fn main() {
    wnd := ui.new_window(ui.WindowCfg{  // V has no default arguments and overloading. 
        width:  600                     // All stdlib functions with many args use Cfg wrappers.
        height: 300 
        title:  'hello world' 
    }) 
    ctx := Context{
        input: ui.new_textbox(wnd) 
        // we don't need to initialize the names array, it's done automatically  
    }
    ctx.input.set_placeholder('Enter your name')
    btn := ui.new_button(wnd, 'Click me', ctx.btn_click)
    for {
        ui.wait_events()
    }
}

fn (ctx mut Context) btn_click() { 
    name := ctx.input.text()
    ctx.input.hide()
    println('current list of names: $ctx.names')  // >> current list of names: [ "Bob", "Alex" ] 
    ui.alert('Hello, $name!')
    if ctx.names.contains(name) {
        ui.alert('I already greeted you ;)') 
    } 
    ctx.names << name 
} 

struct User { /* ... */ }
struct Post { /* ... */ }
struct DB   { /* ... */ }

struct Repo <T> {
    db DB
}

fn new_repo<T>(db DB) Repo {
    return Repo<T>{db: db}
}

fn (r Repo) find_by_id(id int) T? { // `?` means the function returns an optional
    table_name := T.name // in this example getting the name of the type gives us the table name
    return r.db.query_one<T>('select * from $table_name where id = ?', id)
}

fn main() {
    db := new_db()
    users_repo := new_repo<User>(db)
    posts_repo := new_repo<Post>(db)
    user := users_repo.find_by_id(1) or {
        eprintln('User not found')
        return
    }
    post := posts_repo.find_by_id(1) or {
        eprintln('Post not found')
        return
    }
}