Is map in golang a pointer?

map in golang is not a pointer.

Pointer:

A pointer variable points to the memory address of a value.

Similar to variables and constants, you need to declare a pointer before using it. The pointer declaration format is as follows:

var var_name *var-type

var-type is the pointer type, var_name is the pointer variable name, and the * sign is used to specify that the variable is used as a pointer. The following are valid pointer declarations:

map:

Map is an unordered collection of key-value pairs. The most important point of Map is to quickly retrieve data through key. Key is similar to an index and points to the value of the data.

Map is a collection, so we can iterate over it just like arrays and slices. However, Map is unordered and we cannot determine the order in which it is returned. This is because Map is implemented using a hash table.

Define Map

You can use the built-in function make or the map keyword to define Map:

/* 声明变量，默认 map 是 nil */
var map_variable map[key_data_type]value_data_type
/* 使用 make 函数 */
map_variable := make(map[key_data_type]value_data_type)

If the map is not initialized, a nil map will be created. nil map cannot be used to store key-value pairs

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