How to define Map in Go language

This article mainly explains "how to define Map in Go language". The content of the explanation is simple and clear, and it is easy to learn and understand. Please follow the editor's train of thought to study and learn "how to define Map in Go language".

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 is go golang is a compiled language that can compile the code into machine code, and the compiled binaries can be deployed directly to the target machine without additional dependencies, so golang outperforms other interpretive languages and can use goroutine in golang to achieve concurrency. It provides a very elegant goroutine scheduler system that can easily generate millions of goroutine.

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