Go + Otto minimal sample

gistfile1.txt

package main

import (
       "fmt"
       
       "github.com/robertkrimen/otto"
)

func main() {
     vm := otto.New()
     vm.Run(`
         abc = 2 + 2;
         console.log("The value of abc is " + abc); // 4
     `)
     if value, err := vm.Get("abc"); err == nil {
        if value_int, err := value.ToInteger(); err == nil {
          fmt.Printf("%d, %#v\n", value_int, err)
        }
     }
     vm.Set("twoPlus", func(call otto.FunctionCall) otto.Value {
         right, _ := call.Argument(0).ToInteger()
         result, _ := vm.ToValue(2 + right)
         return result
     })
     result, _ := vm.Run(`
         result = twoPlus(2.0); // 4
    `)
    fmt.Printf("%#v\n", result)
}