golang 通用Contains方法
package mainimport (
"errors"
"fmt"
"reflect"
)
// 判断obj是否在target中，target支持的类型arrary,slice,map
func Contain(obj interface{}, target interface{}) (bool, error) {
targetValue := reflect.ValueOf(target)
switch reflect.TypeOf(target).Kind() {
case reflect.Slice, reflect.Array:
for i := 0; i < targetValue.Len(); i++ {
if targetValue.Index(i).Interface() == obj {
return true, nil
}
}
case reflect.Map:
if targetValue.MapIndex(reflect.ValueOf(obj)).IsValid() {
return true, nil
}
}
return false, errors.New("not in array")
}
func main() {
testMap()
testArray()
testSlice()
}
func testArray() {
a := 1
b := int{1, 2, 3}
fmt.Println(Contain(a, b))
c := "a"
d := string{"b", "c", "d", "a"}
fmt.Println(Contain(c, d))
e := 1.1
f := float64{1.2, 1.3, 1.1, 1.4}
fmt.Println(Contain(e, f))
g := 1
h := interface{}{2, 4, 6, 1}
fmt.Println(Contain(g, h))
i := int64{}
fmt.Println(Contain(a, i))
}
func testSlice() {
a := 1
b := []int{1, 2, 3}
fmt.Println(Contain(a, b))
c := "a"
d := []string{"b", "c", "d", "a"}
fmt.Println(Contain(c, d))
e := 1.1
f := []float64{1.2, 1.3, 1.1, 1.4}
fmt.Println(Contain(e, f))
g := 1
h := []interface{}{2, 4, 6, 1}
fmt.Println(Contain(g, h))
i := []int64{}
fmt.Println(Contain(a, i))
}
func testMap() {
var a = mapstring{1: "1", 2: "2"}
fmt.Println(Contain(3, a))
var b = mapint{"1": 1, "2": 2}
fmt.Println(Contain("1", b))
var c = map[]int{"1": {1, 2}, "2": {2, 3}}
fmt.Println(Contain("6", c))
}
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