可变参数切片作为参数错误:无法用 1 个值初始化 2 个变量

Question

尝试使用可变数组组合多个切片，我收到错误：无法使用 2 个值初始化 1 个变量

如何调用此组合函数？

代码如下：

func Combine(ss ...[]string) []string {
    mp := map[string]bool{}
    for _, s := range ss {
        for _, v := range s {
            if v != "" {
                if _, ok := mp[v]; !ok {
                    mp[v] = true
                }
            }
        }
    }
    combined := []string{}
    for v := range mp {
        combined = append(combined, v)
    }
    return combined
}

tests := []struct {
        caseName string
        s1       []string
        s2       []string
        want     []string
    }{
        {
            caseName: "Test combining 2 slices",
            s1:       []string{"a", "b", "c", "c", ""},
            s2:       []string{"a", "b", "z", "z", "", "y"},
            want:     []string{"a", "b", "c", "y", "z"},
        },
    }

actual, _ := Combine(test.s1, test.s2)

Answer 1

可变参数调用参数格式很好。

该错误是由于您的函数Combine返回一个项目，而不是两个项目：

// actual, _ := Combine(test.s1, test.s2) // fails as only one item is returned
actual := Combine(test.s1, test.s2)