Update README.md

README.md

@@ -285,96 +285,7 @@ func main() {
 
 In the example above, a variable `b` is defined by the user before compilation using `Script.Add()` function. Then a compiled bytecode `c` is used to execute the bytecode and get the value of global variables. In this example, the value of global variable `a` is read using `Compiled.Get()` function.
 
-If you need the custom data types (outside Tengo's primitive types), you can define your own `struct` that implements `objects.Object` interface _(and optionally `objects.Callable` if you want to make function-like invokable objects)_.
-
-```golang
-import (
-	"errors"
-	"fmt"
-
-	"github.com/d5/tengo/compiler/token"
-	"github.com/d5/tengo/objects"
-	"github.com/d5/tengo/script"
-)
-
-type Counter struct {
-	value int64
-}
-
-func (o *Counter) TypeName() string {
-	return "counter"
-}
-
-func (o *Counter) String() string {
-	return fmt.Sprintf("Counter(%d)", o.value)
-}
-
-func (o *Counter) BinaryOp(op token.Token, rhs objects.Object) (objects.Object, error) {
-	switch rhs := rhs.(type) {
-	case *Counter:
-		switch op {
-		case token.Add:
-			return &Counter{value: o.value + rhs.value}, nil
-		case token.Sub:
-			return &Counter{value: o.value - rhs.value}, nil
-		}
-	case *objects.Int:
-		switch op {
-		case token.Add:
-			return &Counter{value: o.value + rhs.Value}, nil
-		case token.Sub:
-			return &Counter{value: o.value - rhs.Value}, nil
-		}
-	}
-
-	return nil, errors.New("invalid operator")
-}
-
-func (o *Counter) IsFalsy() bool {
-	return o.value == 0
-}
-
-func (o *Counter) Equals(t objects.Object) bool {
-	if tc, ok := t.(*Counter); ok {
-		return o.value == tc.value
-	}
-
-	return false
-}
-
-func (o *Counter) Copy() objects.Object {
-	return &Counter{value: o.value}
-}
-
-func (o *Counter) Call(args ...objects.Object) (objects.Object, error) {
-	return &objects.Int{Value: o.value}, nil
-}
-
-var code = []byte(`
-arr := [1, 2, 3, 4]
-for x in arr {
-	c1 += x
-}
-out := c1()`)
-
-func main() {
-	s := script.New(code)
-
-	// define variable 'c1'
-	_ = s.Add("c1", &Counter{value: 5})
-
-	// compile the source
-	c, err := s.Run()
-	if err != nil {
-		panic(err)
-	}
-
-	// retrieve value of 'out'
-	out := c.Get("out")
-	fmt.Println(out.Int()) // prints "15" ( = 5 + (1 + 2 + 3 + 4) )
-}
-
-```
+One can easily use the custom data types by implementing `objects.Object` interface. See [Interoperability](https://github.com/d5/tengo/wiki/Interoperability) for more details.
 
 As an alternative to using **Script**, you can directly create and interact with the parser, compiler, and, VMs directly. There's no good documentation yet, but, check out Script code if you are interested.