go - 在循环一个带有范围应用程序中断的 channel 之后

Question

我有一个问题，我的应用程序在 channel 循环后不会到达下一条语句。为了阐明我的意思，请查看以下代码片段。

func CreateAccount(name, email, password string) (string, string) {

    validation := make(chan error)
    errColl := make([]error, 3, 3)
    iterator := 0

    go func() {
        nameErr := IsNameValid(name)
        validation <- nameErr
    }()

    go func() {
        emailErr := IsEmailValid(email)
        validation <- emailErr

    }()

    go func() {
        passwordErr := IsPasswordValid(password)
        validation <- passwordErr
    }()

    for err := range validation {
        errColl[iterator] = err
        iterator++
    }
    fmt.Println("Hello")


    return "hello", "dude"

}

这是我的创建帐户功能。在三个 goroutine 之后，我对 channel 验证进行了循环。循环完成后，语句

fmt.Println("Hello)

永远不会执行。但是当我像这样更改功能时。

func CreateAccount(name, email, password string) (string, string) {

    validation := make(chan error)
    errColl := make([]error, 3, 3)
    //iterator := 0

    go func() {
        nameErr := IsNameValid(name)
        validation <- nameErr
    }()

    go func() {
        emailErr := IsEmailValid(email)
        validation <- emailErr

    }()

    go func() {
        passwordErr := IsPasswordValid(password)
        validation <- passwordErr
    }()

    errColl[0] = <-validation
    errColl[1] = <-validation
    errColl[2] = <-validation
    close(validation)
    fmt.Println("Hello")

    return "hello", "dude"

}

你好要打印出来，加上我得到了返回值。
我在第一个代码片段中做错了什么？

Answer 1

validation channel 永远不会关闭。

for err := range validation {
    errColl[iterator] = err
    iterator++
}

The Go Programming Language Specification

For statements

A "for" statement with a "range" clause iterates through all entries of an array, slice, string or map, or values received on a channel.

For channels, the iteration values produced are the successive values sent on the channel until the channel is closed.