package main

import (
 "fmt"
 "unsafe"
)

func main() {
 slice := []int{1, 2, 3}
 arrayPtr := (*[3]int)(unsafe.Pointer(&slice[0]))
 fmt.Println(*arrayPtr)
}

package main

import "fmt"

func main() {
    slice := []int{1, 2, 3}
    var array [3]int
    copy(array[:], slice)
    fmt.Println(array)
}

package main

import (
    "bufio"
    "fmt"
    "log"
    "os"
)

func main() {
    file, err := os.Open("example.txt")
    if err != nil {
        log.Fatal(err)
    }
    defer file.Close()

    scanner := bufio.NewScanner(file)
    for scanner.Scan() {
        fmt.Println(scanner.Text())
    }

    if err := scanner.Err(); err != nil {
        log.Fatal(err)
    }
}

package main

import (
    "fmt"
    "time"
)

func main() {
    ticker := time.NewTicker(1 * time.Second)
    defer ticker.Stop() 

    for {
        select {
        case <-ticker.C: 
            fmt.Println("Tick at", time.Now())
        // ...
        }
    }
}

info := ProgInfo{0, 1, 2, 3}

info := ProgInfo{
    Flags:    0,
    Reguse:   1,
    Regset:   2,
    Regindex: 3,
}

package main

import (
    "fmt"
    "time"
)

func main() {
    now := time.Now()

    newTime := now.Add(2 * time.Hour)
    fmt.Println("Time after 2 hours:", newTime)
    newTime = now.Add(-2 * time.Hour)
    fmt.Println("Time before 2 hours:", newTime)

    duration := newTime.Sub(now)
    fmt.Println("Duration newTime to now:", duration)
}

data := "test data"

Post(url string, contentType string, body io.Reader) (resp *http.Response, err error)

type Reader interface {
    Read(p []byte) (n int, err error)
}

func main() {
    data := "test data"
  
    contentType := "text/plain"
  
    body := strings.NewReader(data)
    // или 
    // body := bytes.NewBufferString(data)
  
    resp, err := http.Post("https://example.com", contentType, body)
 
    // ....
}

type sigFunc func(a int, b float64) (bool, error)

func functionA(a int, b float64) (bool, error) {
    return true, nil
}

func functionB(a int, b float64) (bool, error) {
    return false, nil
}

func main() {
    var x sigFunc = functionA
    x = functionB
    print(x)
}