Cannot push into array that was set with vm.Set()

[mgregory-carecloud]

This example prints a TypeError with no error message.

func main() {
	vm := otto.New();
	arr := []string{"wow", "hey"};
	vm.Set("arr", arr);

	_, err := vm.Run("console.log(arr); arr.push('huh?'); console.log(arr);");
	if err != nil {
		log.Print(err.Error());
	}
}

Otto could fix this by cloning inputs automatically, or at least returning a helpful error message.

For now, cloning your inputs will resolve the issue. (Note the 'arr = arr.slice()')

func main() {
	vm := otto.New();
	arr := []string{"wow", "hey"};
	vm.Set("arr", arr);

	_, err := vm.Run("arr = arr.slice(); console.log(arr); arr.push('huh?'); console.log(arr);");
	if err != nil {
		log.Print(err.Error());
	}
}