What are the best practices for returning values ​​from functions in Golang?

The values ​​returned by Go functions should: 1. Keep the minimum number; 2. Use named return values; 3. Pay attention to the order of return values; 4. Use error values ​​to indicate failure; 5. Consider using structures to organize related fields.

Best Practices for Returning Values ​​from Go Functions

In Go, functions can return multiple values. This is useful in situations where multiple related pieces of information need to be returned. However, in order to keep your code clear and maintainable, it's important to follow some best practices.

1. Keep the number of return values ​​to a minimum

The more values ​​returned, the harder it is to use and understand the function. Try to return only necessary and relevant information.

2. Use named return values ​​

Named return values ​​make the code easier to read and understand. For example, instead of returning (int, string), return (id int, name string).

3. Pay attention to the order of return values

The order of the values ​​returned by the function is important because the caller needs to use them in the same order. Make sure the order of return values ​​is clearly stated in the documentation.

4. Use error values

If the function may fail, use the error value to indicate the error. This is cleaner and more scalable than returning a boolean or null value.

5. Consider using a structure

If you need to return multiple related fields, you can use a structure to organize them. This makes the code easier to read and maintain.

Practical case:

The following is a GetUser() function, which returns the user's id and name:

func GetUser(id int) (int, string, error) {
    // 从数据库中获取用户数据
    user, err := db.GetUser(id)
    if err != nil {
        return 0, "", err
    }

    // 返回用户 id 和 name
    return user.ID, user.Name, nil
}

By following these best practices, you can write Go functions that are easy to use and maintain.

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