我收到关于没有足够参数返回的错误消息

Question

I want return string or slice at one function, I can use in php. but, get some error in Go

package main

import "fmt"

func main() {
    // arr := []int {34, 23, 45, 56, 62, 45, 12, 96, 22}
    arr := []int{}

    fmt.Println(test(arr))
}

func test(dataList []int ) ( string ,  []int )  {
    if dataList == nil{
       return "this is string"
    }

    return []int{}
}

error: not enough arguments to return

Answer 1

If you define two return types, you always need to return the two types. You can not return only one.

Have a look at this:

func test(dataList []int) (string, []int) {
    if dataList == nil {
        return "this is string", []int{}
    }

    return "", []int{}
}

This would work, because I am returning both a string and an []int in every case (and in exact the defined order).

Maybe if you can explain what your function tries to accomplish, we can give better advice on how to design the function.