restructure project

internal/builtins/id.go

@@ -0,0 +1,41 @@
+package builtins
+
+import (
+	"fmt"
+	"monkey/internal/object"
+	"monkey/internal/typing"
+)
+
+// IdOf ...
+func IdOf(args ...object.Object) object.Object {
+	if err := typing.Check(
+		"id", args,
+		typing.ExactArgs(1),
+	); err != nil {
+		return newError(err.Error())
+	}
+
+	arg := args[0]
+
+	if n, ok := arg.(*object.Null); ok {
+		return &object.String{Value: fmt.Sprintf("%p", n)}
+	} else if b, ok := arg.(*object.Boolean); ok {
+		return &object.String{Value: fmt.Sprintf("%p", b)}
+	} else if i, ok := arg.(*object.Integer); ok {
+		return &object.String{Value: fmt.Sprintf("%p", i)}
+	} else if s, ok := arg.(*object.String); ok {
+		return &object.String{Value: fmt.Sprintf("%p", s)}
+	} else if a, ok := arg.(*object.Array); ok {
+		return &object.String{Value: fmt.Sprintf("%p", a)}
+	} else if h, ok := arg.(*object.Hash); ok {
+		return &object.String{Value: fmt.Sprintf("%p", h)}
+	} else if f, ok := arg.(*object.Function); ok {
+		return &object.String{Value: fmt.Sprintf("%p", f)}
+	} else if c, ok := arg.(*object.Closure); ok {
+		return &object.String{Value: fmt.Sprintf("%p", c)}
+	} else if b, ok := arg.(*object.Builtin); ok {
+		return &object.String{Value: fmt.Sprintf("%p", b)}
+	}
+
+	return nil
+}