Created
March 24, 2019 13:15
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Go语言语法片段
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// 判断go语言中变量的类型 | |
package main | |
import ( | |
"fmt" | |
) | |
var container = []string{"zero", "one", "two"} | |
func main() { | |
container := map[int]string{0: "zero", 1: "one", 2: "two"} | |
// 方式1。 | |
_, ok1 := interface{}(container).([]string) | |
_, ok2 := interface{}(container).(map[int]string) | |
if !(ok1 || ok2) { | |
fmt.Printf("Error: unsupported container type: %T\n", container) | |
return | |
} | |
fmt.Printf("The element is %q. (container type: %T)\n", | |
container[1], container) | |
// 方式2。 | |
elem, err := getElement(container) | |
if err != nil { | |
fmt.Printf("Error: %s\n", err) | |
return | |
} | |
fmt.Printf("The element is %q. (container type: %T)\n", | |
elem, container) | |
} | |
func getElement(containerI interface{}) (elem string, err error) { | |
switch t := containerI.(type) { | |
case []string: | |
elem = t[1] | |
case map[int]string: | |
elem = t[1] | |
default: | |
err = fmt.Errorf("unsupported container type: %T", containerI) | |
return | |
} | |
return | |
} |
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