Golang notes: Closures in loops

This is a creation in Article, where the information may have evolved or changed.

First, a previous error code.

    package main    import (                "fmt"                "sync"                )    func main(){        var wg sync.WaitGroup        var names = [2]string{"1", "2"}        for _, name := range names {            wg.Add(1)            go func() {                    fmt.Println(name)                    wg.Done()            }()        }        wg.Wait()    }

This print, printed two times, but the results are

    2    2

In order to have the effect of looping printing, you need to pass in the form of an input parameter.

    package main    import (                "fmt"                "sync"                )    func main(){        var wg sync.WaitGroup        var names = [2]string{"1", "2"}        for _, name := range names {            wg.Add(1)            go func(n) {                    fmt.Println(n)                    wg.Done()            }(name)        }        wg.Wait()    }

Print it out for

   2   1