Golang {} initialization

This is a created article in which the information may have evolved or changed.

Some of the types in the Golang can be assigned nil, and some types cannot be assigned a value of nil.

You cannot assign nil to a type that initialized value is not nil, for example:

bool

int, IntN

UINT, UINTN

Floatn

Complexn

Byte

Rune

String

struct

You can assign nil to a type that initialized value is nil, for example:

Array

Slice

Map

Chan

Func

Interface

Pointer

But there is another problem with these types, which can be used to initialize the list with {}.

Simply understood, {} can be used to initialize the list with {} in the type definition. Otherwise, you can't.

bool

int, IntN

UINT, UINTN

Floatn

Complexn

Byte

Rune

String

Chan

Pointer

Cannot use {} to initialize the list

But

Array

Slice

Map

struct

You can use {} to initialize the list.

The above is just a simple understanding, the exact answer also refer to the official go information.