How to use golang variables

Golang is a statically typed language, and the use of variables is very important. In Golang, the declaration, initialization and use of variables need to follow certain rules. This article will introduce the specific use of Golang variables, hoping to be helpful to beginners.

1. Declaration and initialization of variables

The declaration and initialization of variables in Golang can be completed together or separately:

1. Completed together

var a int = 10

This method is the general declaration and initialization method. Among them, var is the keyword, a is the variable name, int is the variable type, and 10 is the initial value of the variable.

2. Complete it separately

var a int

a = 10

In this way, variable a is declared first, and then variable a is initialized as 10. This method is more suitable for situations where variable declaration and initialization are completed separately.

2. Assignment of variables

Variable assignment in Golang can be completed through the equal sign:

var a int

a = 10

The above method is the most common method of variable assignment.

There is also a more concise way:

a := 10

This way can complete the variable declaration and initialization together, and is the most common variable declaration and initialization method.

3. Multiple assignment of variables

Variables in Golang support multiple assignments, that is, multiple variables can be assigned to multiple variables at the same time:

var a,b int

a,b = 10,20

This method can assign values ​​to a and b at the same time.

There is also a more concise way:

a,b := 10,20

This way can complete the variable declaration and initialization together, or you can Assign values ​​to a and b at the same time.

4. Anonymous variables

The role of anonymous variables in Golang is very important.

1. Function returns multiple values ​​

Golang’s functions support returning multiple values. If you don’t need some of the values, you can use anonymous variables to ignore them, for example:

func test() (int, int) {

return 10, 20

}

var a, _ = test()

In this example, anonymous variables are used to ignore the second return value.

2. Ignore certain values ​​in assignment operations

In some cases, we do not need to use the values ​​​​of certain assignment operations, and we can also use anonymous variables to ignore them, for example:

a, _ := test()

In this example, an anonymous variable is used to ignore the second return value.

3. Global variable initialization

In Golang, global variables must be initialized. If a global variable is not used, you can use an anonymous variable to occupy its position, for example:

var num int = 10

var _ = num

This example , an anonymous variable is used to occupy the position of num.

5. Scope of variables

The scope of variables in Golang is very clear, including global variables and local variables.

1. Global variables

Global variables can be accessed anywhere.

2. Local variables

Local variables can be accessed in the function in which they are located, unless they are passed into another function.

6. Summary

This article introduces how to use Golang variables, including variable declaration and initialization, variable assignment, variable multiple assignment, anonymous variables and variable scope. This knowledge is very important when writing Golang programs, and beginners need to understand and master it.

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