10 Common Go (Golang) Code Snippets for Various Tasks



10 Common Go (Golang) Code Snippets for Various Tasks

It’s challenging to provide a definitive list of the “top 10” Go (Golang) code snippets, as the usefulness of code snippets depends on the specific problem you’re trying to solve. However, I can provide you with ten commonly used Go code snippets that cover a range of tasks and concepts:

1. Hello World:

package main

import "fmt"

func main() {
    fmt.Println("Hello, World!")
}

2. Reading Input from Console:

package main

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

func main() {
    scanner := bufio.NewScanner(os.Stdin)
    fmt.Print("Enter text: ")
    scanner.Scan()
    input := scanner.Text()
    fmt.Println("You entered:", input)
}

3. Creating a Goroutine:

package main

import (
    "fmt"
    "time"
)

func printNumbers() {
    for i := 1; i <= 5; i++ {
        fmt.Println(i)
        time.Sleep(time.Second)
    }
}

func main() {
    go printNumbers()
    time.Sleep(3 * time.Second)
}

4. Working with Slices:

package main

import "fmt"

func main() {
    numbers := []int{1, 2, 3, 4, 5}
    fmt.Println("Slice:", numbers)
    fmt.Println("Length:", len(numbers))
    fmt.Println("First Element:", numbers[0])
}

5. Error Handling:

package main

import (
    "errors"
    "fmt"
)

func divide(a, b float64) (float64, error) {
    if b == 0 {
        return 0, errors.New("division by zero")
    }
    return a / b, nil
}

func main() {
    result, err := divide(10, 2)
    if err != nil {
        fmt.Println("Error:", err)
        return
    }
    fmt.Println("Result:", result)
}

6. HTTP Server:

package main

import (
    "fmt"
    "net/http"
)

func handler(w http.ResponseWriter, r *http.Request) {
    fmt.Fprintln(w, "Hello, HTTP!")
}

func main() {
    http.HandleFunc("/", handler)
    http.ListenAndServe(":8080", nil)
}

7. JSON Marshalling and Unmarshalling:

package main

import (
    "fmt"
    "encoding/json"
)

type Person struct {
    Name  string `json:"name"`
    Age   int    `json:"age"`
}

func main() {
    jsonStr := `{"name":"Alice", "age":30}`
    var person Person
    err := json.Unmarshal([]byte(jsonStr), &person)
    if err != nil {
        fmt.Println("Error:", err)
        return
    }
    fmt.Println("Name:", person.Name)
    fmt.Println("Age:", person.Age)
}

8. Concurrency with Wait Groups:

package main

import (
    "fmt"
    "sync"
)

func worker(id int, wg *sync.WaitGroup) {
    defer wg.Done()
    fmt.Printf("Worker %d started\n", id)
}

func main() {
    var wg sync.WaitGroup
    for i := 1; i <= 5; i++ {
        wg.Add(1)
        go worker(i, &wg)
    }
    wg.Wait()
    fmt.Println("All workers have finished.")
}

9. Reading and Writing Files:

package main

import (
    "fmt"
    "io/ioutil"
)

func main() {
    data := []byte("Hello, File!")
    err := ioutil.WriteFile("example.txt", data, 0644)
    if err != nil {
        fmt.Println("Error:", err)
        return
    }
    content, err := ioutil.ReadFile("example.txt")
    if err != nil {
        fmt.Println("Error:", err)
        return
    }
    fmt.Println("File Content:", string(content))
}

10. Sorting Slices:

```go
package main

import (
    "fmt"
    "sort"
)

func main() {
    numbers := []int{5, 2, 9, 1, 5}
    sort.Ints(numbers)
    fmt.Println("Sorted Slice:", numbers)
}
```

These code snippets cover a range of common Go programming tasks and concepts, from basic I/O operations to concurrency, error handling, and more. Feel free to adapt and use them as needed in your Go projects.


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