untyped json unmarshal

main.go

package main

import "encoding/json"
import "fmt"
import "strconv"
import "reflect"

var A = `[1, "2"]`
var B = `[3, 4]`
var C = `[5, {"a":"b"}]`

func Decode(data string) {
	fmt.Print("decode:", data, " -> ")
	s := []interface{}{}
	json.Unmarshal([]byte(data), &s)
	for _, x := range s {
		var y float64
		switch i := x.(type) {
		case float64:
			y = i
		case string:
			y, _ = strconv.ParseFloat(i, 64)
		default:
			fmt.Println(" unknown type:", reflect.TypeOf(x))
			continue
		}
		fmt.Print(" ", y)
	}
	fmt.Println()
}

func main() {
	Decode(A)
	Decode(B)
	Decode(C)
}