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⚙️ Option Pattern в Go: гибкая и читаемая настройка объектов

В статье Leapcell ["Option Pattern in Go: Advanced Parameter Handling"](https://dev.to/leapcell/option-pattern-in-go-advanced-parameter-handling-15hf) рассматривается эффективный способ управления параметрами функций и конструкторов в Go.:contentReference[oaicite:7]{index=7}

## 🧩 Проблема

:contentReference[oaicite:9]{index=9}:contentReference[oaicite:11]{index=11}


func NewServer(addr string, port int, timeout time.Duration, maxConn int, protocol string) *Server {
// ...
}


Недостатки:
- :contentReference[oaicite:13]{index=13}
- :contentReference[oaicite:16]{index=16}
- :contentReference[oaicite:19]{index=19}
- :contentReference[oaicite:22]{index=22}:contentReference[oaicite:24]{index=24}

## 💡 Решение: Option Pattern

:contentReference[oaicite:26]{index=26}:contentReference[oaicite:28]{index=28}


type Server struct {
addr string
port int
timeout time.Duration
maxConn int
protocol string
}

type Option func(*Server)

func WithTimeout(t time.Duration) Option {
return func(s *Server) {
s.timeout = t
}
}

func WithMaxConn(max int) Option {
return func(s *Server) {
s.maxConn = max
}
}



:contentReference[oaicite:30]{index=30}:contentReference[oaicite:32]{index=32}


func NewServer(addr string, opts ...Option) *Server {
s := &Server{
addr: addr,
port: 8080,
timeout: 30 * time.Second,
maxConn: 100,
protocol: "tcp",
}

for _, opt := range opts {
opt(s)
}
return s
}


Использование:


server := NewServer("localhost",
WithTimeout(60*time.Second),
WithMaxConn(500),
)


## 🛠️ Дополнительные возможности

- Валидация параметров:


func WithPort(port int) Option {
return func(s *Server) {
if port < 0 || port > 65535 {
panic("invalid port number")
}
s.port = port
}
}


- Группировка опций:


type NetworkOptions struct {
Protocol string
Timeout time.Duration
}

func WithNetworkOptions(opts NetworkOptions) Option {
return func(s *Server) {
s.protocol = opts.Protocol
s.timeout = opts.Timeout
}
}


Преимущества

- :contentReference[oaicite:34]{index=34}
- :contentReference[oaicite:37]{index=37}
- :contentReference[oaicite:40]{index=40}
- :contentReference[oaicite:43]{index=43}:contentReference[oaicite:45]{index=45}

:contentReference[oaicite:47]{index=47}:contentReference[oaicite:49]{index=49}

📌 Читать



tg-me.com/golang_interview/1192
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Last Update:

⚙️ Option Pattern в Go: гибкая и читаемая настройка объектов

В статье Leapcell ["Option Pattern in Go: Advanced Parameter Handling"](https://dev.to/leapcell/option-pattern-in-go-advanced-parameter-handling-15hf) рассматривается эффективный способ управления параметрами функций и конструкторов в Go.:contentReference[oaicite:7]{index=7}

## 🧩 Проблема

:contentReference[oaicite:9]{index=9}:contentReference[oaicite:11]{index=11}


func NewServer(addr string, port int, timeout time.Duration, maxConn int, protocol string) *Server {
// ...
}


Недостатки:
- :contentReference[oaicite:13]{index=13}
- :contentReference[oaicite:16]{index=16}
- :contentReference[oaicite:19]{index=19}
- :contentReference[oaicite:22]{index=22}:contentReference[oaicite:24]{index=24}

## 💡 Решение: Option Pattern

:contentReference[oaicite:26]{index=26}:contentReference[oaicite:28]{index=28}


type Server struct {
addr string
port int
timeout time.Duration
maxConn int
protocol string
}

type Option func(*Server)

func WithTimeout(t time.Duration) Option {
return func(s *Server) {
s.timeout = t
}
}

func WithMaxConn(max int) Option {
return func(s *Server) {
s.maxConn = max
}
}



:contentReference[oaicite:30]{index=30}:contentReference[oaicite:32]{index=32}


func NewServer(addr string, opts ...Option) *Server {
s := &Server{
addr: addr,
port: 8080,
timeout: 30 * time.Second,
maxConn: 100,
protocol: "tcp",
}

for _, opt := range opts {
opt(s)
}
return s
}


Использование:


server := NewServer("localhost",
WithTimeout(60*time.Second),
WithMaxConn(500),
)


## 🛠️ Дополнительные возможности

- Валидация параметров:


func WithPort(port int) Option {
return func(s *Server) {
if port < 0 || port > 65535 {
panic("invalid port number")
}
s.port = port
}
}


- Группировка опций:


type NetworkOptions struct {
Protocol string
Timeout time.Duration
}

func WithNetworkOptions(opts NetworkOptions) Option {
return func(s *Server) {
s.protocol = opts.Protocol
s.timeout = opts.Timeout
}
}


Преимущества

- :contentReference[oaicite:34]{index=34}
- :contentReference[oaicite:37]{index=37}
- :contentReference[oaicite:40]{index=40}
- :contentReference[oaicite:43]{index=43}:contentReference[oaicite:45]{index=45}

:contentReference[oaicite:47]{index=47}:contentReference[oaicite:49]{index=49}

📌 Читать

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