Go 言語プロジェクトの革新的なテクノロジーとトレンドを理解する

go mod init example.com/myproject

go get github.com/gin-gonic/gin

package main

import "github.com/gin-gonic/gin"

func main() {
    r := gin.Default()
    r.GET("/", func(c *gin.Context) {
        c.JSON(200, gin.H{
            "message": "Hello, World!",
        })
    })
    r.Run()
}

package main

import (
    "fmt"
    "sync"
)

func main() {
    var wg sync.WaitGroup
    ch := make(chan int)

    wg.Add(2)

    go func() {
        defer wg.Done()
        for i := 0; i < 5; i++ {
            ch <- i
        }
        close(ch)
    }()

    go func() {
        defer wg.Done()
        for v := range ch {
            fmt.Println(v)
        }
    }()

    wg.Wait()
}

package main

import (
    "fmt"
    "time"
)

func main() {
    start := time.Now()
    sum := 0
    for i := 0; i < 1000000; i++ {
        sum += i
    }
    fmt.Printf("Sum: %d
", sum)
    fmt.Printf("Time: %s
", time.Since(start))
}