初始化指针数组-无法使类型* [] type

Question

Its a simple code, saving car type objects into a car type array. I am trying to use pointer here to pass array reference.

There are 2 problems:

1 - I can't initialize it as empty array. When I use make, it says:

cannot make type *[]car

2 - If I don't use make, runtime error occurs:

panic: runtime error: invalid memory address or nil pointer dereference

---

Code:

import "fmt"

type car struct {
    plate string
    color string
}

func main() {

    var _cars *[]car        // list of cars
    _cars = make(*[]car, 4) // initialize empty cars list

    saveCar(_cars, car{"ABC-123", "Black"})
    saveCar(_cars, car{"ABC-456", "Black"})
    saveCar(_cars, car{"ABC-789", "Black"})

    fmt.Println(_cars)
}

func saveCar(_cars_list *[]car, _car car) int {

    for index, current := range *_cars_list {
        // if empty place found, save car
        if (car{}) == current {

            // save car
            (*_cars_list)[index] = _car

            // return the saved index
            return index
        }
    }

    return -1
}

Answer 1

Changing this would make your code work:

tCars := make([]car, 4)
_cars = &tCars