英文:
Multidimensional Slices in Go
问题
我想在Go语言中使用一个具有可变数量元素的数组/切片（在编译时不知道），并且能够动态添加不同类型的新元素，例如：
data[0] := "string"
data[1] // 切片
data[1][0] := "another string"
data[1][1] := 42 // 整数
这种情况是否可能？
英文:
I would like to have an array / slice in Go with a variadic number of elements (not known at compile time) and be able to dinamically add new elements of different types, for instance:
data[0] := "string"
data[1] // slice
data[1][0] := "another string"
data[1][1] := 42 // int
Is this possible somehow?
答案1
得分: 6
这是一个使用空接口interface{}的方法，虽然有点丑陋，但是可行：
package main
import "fmt"
func main() {
variadic := []interface{}{}
variadic = append(variadic, "foo")
variadic = append(variadic, []interface{}{"bar", 42})
// 这将打印出"foo"
fmt.Println(variadic[0])
// 注意，在访问之前，你需要将variadic[1]转换为数组
fmt.Println(variadic[1].([]interface{})[0])
}
如果你允许每个元素都是一个长度可变的任意类型的数组，那么代码会稍微简洁一些：
package main
import "fmt"
func main() {
variadic := [][]interface{}{}
variadic = append(variadic, []interface{}{"foo"})
variadic = append(variadic, []interface{}{"bar", 42})
fmt.Println(variadic[0])
fmt.Println(variadic[1][0])
fmt.Println(variadic[1][1])
}
英文:
It's a bit ugly but possible using empty interfaces, interface{}:
package main
import "fmt"
func main() {
variadic := []interface{}{}
variadic = append(variadic, "foo")
variadic = append(variadic, []interface{}{"bar", 42})
//this will print "foo"
fmt.Println(variadic[0])
//note that you have to cast variadic[1] to an array before accessing it
fmt.Println(variadic[1].([]interface{})[0])
}
If you allow the assumption that each element must be an array of anything with varying length, it's a bit less ugly:
package main
import "fmt"
func main() {
variadic := [][]interface{}{}
variadic = append(variadic, []interface{}{"foo"})
variadic = append(variadic, []interface{}{"bar", 42})
fmt.Println(variadic[0])
fmt.Println(variadic[1][0])
fmt.Println(variadic[1][1])
}
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