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I'm new to Go and I'm a bit confused about the different ways to declare container variables. Specifically, I want to declare a list, and I found three different approaches:
var l1 list.Listl2 := list.New()l3 := new(list.List)
Here's a simple example demonstrating these declarations:
package main
import (
"container/list"
"fmt"
"reflect"
)
func main() {
var l1 list.List // direct declaration
l2 := list.New() // using .New()
l3 := new(list.List) // using new()
fmt.Println(reflect.TypeOf(l1)) // list.List
fmt.Println(reflect.TypeOf(l2)) // *list.List
fmt.Println(reflect.TypeOf(l3)) // *list.List
}
I noticed that the latter two declarations (l2 and l3) result in variables of type *list.List, while the first one (l1) is of type list.List.
I noticed a related question that discusses the difference between v := &Vector{} and v := new(Vector). While that question is helpful, it doesn't address the specific case of declaring the difference between direct declaration and .New() (var l1 list.List l2 := list.New()) and the rest method.
Could someone explain:
The differences between these three approaches in the context?
When should I use each one, and what are the implications of using one over the other?
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