在Go中声明带有“ var”的新结构实例与使用“ new”有何不同？

Question

The following code creates a usable instance of the struct, Car. How is this different than using new(Car)?

Example:

type Car struct {
  make string
}

func Main() {
  var car Car; // how is this different than "car := new(Car)"?

  car.make = "Honda"
}

Answer 1

One defines a Car variable, the other returns a pointer to a Car.

var car Car      // defines variable car is a Car
car2 := new(Car) // defines variable car2 is a *Car and assigns a Car to back it

car := new(Car) can be implemented in relation to var car Car like this:

var x Car
car := &x