有没有一种方法可以在Go中重载功能？

Question

I have read that there is no way to overload a function in Go. I mean by overloading, a way to have two functions with the same name but with different arguments.

I have seen something strange in the built-in functions of Go:

Let's suppose ch1 is a channel variable:

ch1 := make(chan string)

It is possible to read somthing from a channel like this:

result := <-ch1

But it is also possible to get a status like this:

result, status := <-ch1

So, is there is a way to overloaded a function like a built-in function?

Answer 1

No.

For obvious reasons this is called the comma ok idiom (not a function overload ):

result, status := <-ch1

1- Try this for Channels:

package main

import (
    "fmt"
)

func main() {
    ch1 := make(chan string, 1)
    ch1 <- `Hi`
    result, status := <-ch1
    fmt.Println(result, status) // Hi true

    ch1 <- `Hi`
    close(ch1)
    result, status = <-ch1
    fmt.Println(result, status) // Hi true

    result, status = <-ch1
    fmt.Println(result, status) //    false
}

output:

Hi true
Hi true
 false

---

2- Try this for Maps:

package main

import (
    "fmt"
)

func main() {
    m := map[string]int{"One": 1, "Two": 2}

    result, status := m["One"]
    fmt.Println(result, status) // 1 true

    result, status = m["Two"]
    fmt.Println(result, status) // 2 true

    result, status = m["Zero"]
    fmt.Println(result, status) //  0  false
}

output:

1 true
2 true
0 false

---

3- Try this for interface conversions and type assertions:

package main

import (
    "fmt"
)

func main() {
    var s interface{} = `One`

    result, status := s.(string)
    fmt.Println(result, status) // One true

    i, status := s.(int)
    fmt.Println(i, status) // 0 false
}

output:

One true
0 false