How to initialize a struct which has a pointer-type property？

Question

The struct is like this:

type Node struct {
    Stat *Stat
}


type Stat struct {
    StatInfo []string
}

Initialize the structure, and set properties.

node := new(Node)
node.Stat.Statinfo=strings.Split(somestr," ")

program calls panic:

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

Answer 1

When you create a struct, it's fields default to the zero value of their corresponding type. It's 0 for int, nil for pointer fields, etc.

In your case, the only field Stat is a pointer, after calling new(Node), node.Stat is nil, so it would result in the runtime error you see.

To avoid the error, make sure you initialize the fields before accessing them.