Type conversion of golang function

Type conversion in a function allows one type of data to be converted to another type, thereby extending the functionality of the function. Use the syntax: type_name := variable.(type). For example, you can use the strconv.Atoi function to convert a string to a number and handle errors if the conversion fails.

Introduction to type conversion in Go language functions

In the Go language, type conversion is very important for processing different types of data. Type conversion is used in functions to convert data of one type into another type, thus extending the functionality of the function.

Grammar

The syntax for function type conversion in Go language is very simple:

type_name := variable.(type)

Among them:

• type_name: Converted variable name
• variable: Variable to be converted
• type: Type to be converted

For example, convert a interface{} type value to int Type:

num := i.(int)

Practical case: Convert a string to a number

The following is a function that converts a string to a number:

func ConvertStringToInt(s string) (int, error) {
    num, err := strconv.Atoi(s)
    if err != nil {
        return 0, err
    }
    return num, nil
}

In this function, we use the strconv.Atoi function to convert a string to an integer. If the conversion succeeds, the converted number is returned; if the conversion fails, an error is returned.

Note

You need to pay attention to the following points when using type conversion:

• Implicit type conversion: Some types can be implicitly converted Type conversion, such as int to float64.
• Type assertion: In addition to type conversion, the Go language also provides type assertion, which is used to test whether a value belongs to a specific type.
• Error handling: When type conversion fails, attention should be paid to handling errors.

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