Golang

var a int

Статически строго типизированный язык

var b []int

m := make(map[string][]int)

var (
  a int
  b []int
  m = make(map[string][]int)
)

type MyOwnString string

func (str MyOwnString) Upcase() MyOwnString {
  return MyOwnString(
    strings.ToUpper(string(str))
  )
}

func Handle(name Filename) {
  ...
}

type Uploader struct {
    Path    string
    Payload []byte
}

type Post struct {
    Title   string `json:"title" xml:"Head" orm:"size(255)"`
    Content []byte `json:"body" xml:"Body"`
    Tags    []*Tag `xml:"Tags>Tag" orm:"reverse(many)"`
}

type Handler func(*Request)

func (handle Handler) Serve(r *Request) {
  handle(request)
}

package main

import (
  "strings"
)

package main

import (
  "strings"
  "io/ioutil"
)

package main

import (
  "strings"
  "io/ioutil"
  "github.com/valyala/gorpc"
)

НЕТ ВЕРСИЙ

Варианты

Копирование всех зависимостей
Внешние сервисы
Страдать
dep

type Server struct {
  address         string
  config          *Config
  MaxRequestCount int
}

func (s *Server) Start() {
 ...
}

func (s *Server) stop() {
 ...
}

private

public

number := 1

&number      // => 0xc208042058

number := 1

&number      // => 0xc208042058

var pointer *int

pointer = &number

pointer      // => 0xc208042058
*pointer     // => 1

number := 1

&number      // => 0xc208042058

var pointer *int

pointer = &number

pointer      // => 0xc208042058
*pointer     // => 1

*pointer = 2
number       // => 2

func Request(data Data) {
  data.Type = "Error"
}

func Request(data *Data) {
  data.Type = "Error"
}

ARRAYS == POINTERS

Channels & Goroutines

go func(){
    ...
}()

func Serve() error {
  ...
}

go Serve()

func AllPosts() (chan *Post) {
    channel := make(chan *Post)
    
    go func(){
        defer close(channel)
        var posts []*Post
    
        for i := 0; i < PostTable.Count(); i+=1000 {
            PostTable.Limit(1000).Offset(i).All(&posts)
            for _, post := range posts {
                channel <- post
            }
        }
    }()
    
    return channel
}

for post := range AllPosts() {
    ...
}

select {
    case signal := <-sChannel:
        ...
    case <- timer:
        ...
}

Interfaces

type OAuth interface {
}

type OAuth interface {
    Request(*Request) (*Response, eror)
    Callback(*Request) (*Response, error)
}

10 проектов

ИТОГО

Сложная отладка

Производительность и потребление памяти

vast
  api
    api ........................... up  (Mar17, 1%, 17Mb, <25743>)
  sidekiq
    sidekiq ....................... up  (Mar17, 0%, 219Mb, <25751>)
  web
    unicorn ....................... up  (Mar17, 0%, 116Mb, <25768>)
      child-25820 ................. up  (Mar17, 0%, 159Mb, <25820>)
      child-25823 ................. up  (Mar17, 0%, 162Mb, <25823>)

medialib                   
  services                         
    iframe ........................ up  (00:24, 9%, 6Mb, <19437>)
    transform ..................... up  (00:24, 6%, 10Mb, <19408>)
    uploader ...................... up  (00:24, 0%, 9Mb, <19423>)
  sidekiq                          
    first ......................... up  (16:13, 0%, 80Mb, <21492>)
    second ........................ up  (16:13, 0%, 72Mb, <21619>)
    third ......................... up  (16:13, 0%, 70Mb, <21501>)
  web                              
    puma .......................... up  (16:13, 0%, 72Mb, <21536>)
      child-21539 ................. up  (16:13, 0%, 84Mb, <21539>)
      child-21542 ................. up  (16:13, 0%, 93Mb, <21542>)
      child-21545 ................. up  (16:13, 0%, 89Mb, <21545>)
      child-21548 ................. up  (16:13, 0%, 107Mb, <21548>)
      child-21550 ................. up  (16:13, 0%, 85Mb, <21550>)
      child-21554 ................. up  (16:13, 0%, 141Mb, <21554>)
      child-21557 ................. up  (16:13, 0%, 80Mb, <21557>)
      child-21559 ................. up  (16:13, 0%, 90Mb, <21559>)