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This article introduces the knowledge of "how to define Map in Go language". In the operation of practical cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Map is a collection of unordered key-value pairs. The most important thing about Map is to retrieve data quickly 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 like arrays and slices. However, Map is unordered, and we cannot determine the order in which it is returned, because Map is implemented using the hash table.

Define Map

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

/ * declare variables. The default map is nil * / var map_variable map [key _ data_type] value_data_type/* using the make function * / 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

What go is suitable for go is the abbreviation of golang, while golang can do server-side development, and golang is very suitable for log processing, data packaging, virtual machine processing, database agent and other work. In the aspect of network programming, it is also widely used in web applications, API applications and other fields.

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