Learn Go

Variables are declared like this:

var port int = 8333

Or using a shorthand notation:

port := 8333

Use a regular equal sign to re-assign to a variable:

port = port + 1

Or even shorter:

port += 1

There are several types in Go:

bool

string

int  int8  int16  int32  int64
uint uint8 uint16 uint32 uint64 uintptr

byte // alias for uint8

rune // alias for int32
     // represents a Unicode code point

float32 float64

complex64 complex128

Here's what functions look like:

func GetPort() int {
  return 8333
}

port := GetPort() // `port` is now 8333

Fuctions can also return multiple values:

func GetMetadata() (string, int) {
  return "Bitcoin", 8333
}

name, port := GetMetadata()

If you don't need some of the return values, you can throw them away:

_, port := GetMetadata()

You can also make more complex structures:

type Blockchain struct {
  name string
  port int
}

blockchain := Blockchain{
  name: "Bitcoin",
  port: 8333,
}

fmt.Printf("%s runs on port %d.", blockchain.name, blockchain.port)

Structures can have their own methods:

type Blockchain struct {
  name string
  port int
}

func (b Blockchain) About() string {
  return fmt.Sprintf(
    "%s runs on port %d.",
    blockchain.name,
    blockchain.port,
  )
}

blockchain := Blockchain{
  name: "Bitcoin",
  port: 8333,
}

about := blockchain.About()
fmt.Println(about) // Bitcoin runs on port 8333.