Code reconstruction of golang functions in object-oriented programming

In object-oriented programming, functional code refactoring involves extracting functions and inlining functions. Extract functions: Split complex functions into smaller, reusable functions to improve readability and maintainability. Inline functions: Move simple, directly called functions into the call location, reducing nesting levels and improving performance.

Golang function code reconstruction in object-oriented programming

In object-oriented programming (OOP), objects are viewed as An entity that encapsulates data and behavior. Functions play a vital role in OOP, they can be viewed as independent blocks of code that manipulate the state of an object and perform specific tasks.

Extract functions

A common practice in code refactoring is to extract functions. When a function becomes too long or complex, it can be broken into smaller, more reusable functions. Doing so improves readability and maintainability.

Example:

// 原始函数
func longAndComplexFunction() (int, error) {
    // 复杂代码块
    return 0, nil
}

// 提取的函数
func calculateResult(x int) int {
    // 简单计算
    return x * 2
}

func shortAndSimpleFunction() (int, error) {
    // 调用提取的函数
    return calculateResult(10), nil
}

Inline functions

Inline functions are the opposite of extracting functions. When a function is called simply and directly, it can be inlined to the point where it is called. This helps reduce nesting levels and improve runtime performance.

Example:

// 原始调用
func doSomething() {
    calculateResult(10)
}

// 内联调用
func doSomething() {
    // 直接计算
    _ = 10 * 2
}

Practical case

The following is a practical example that demonstrates how to use extraction functions and inline functions Refactor the code.

// 原始类
type Customer struct {
    Name string
    Address string
    Phone string
}

func (c Customer) GetName() string {
    return c.Name
}

func (c Customer) GetAddress() string {
    return c.Address
}

func (c Customer) GetPhone() string {
    return c.Phone
}

After extracting the function:

type Customer struct {
    Name string
    Address string
    Phone string
}

func (c Customer) GetValue(field string) string {
    switch field {
    case "Name":
        return c.Name
    case "Address":
        return c.Address
    case "Phone":
        return c.Phone
    }
    return ""
}

After inlining the function:

type Customer struct {
    Name string
    Address string
    Phone string
}

func (c Customer) GetValue(field string) string {
    switch field {
    case "Name":
        return c.Name
    case "Address":
        return c.Address
    case "Phone":
        return c.Phone
    }
    return ""
}

func doSomething(c Customer) {
    _ = c.GetValue("Name")
    _ = c.GetValue("Address")
    _ = c.GetValue("Phone")
}

By inserting GetName() By extracting the , GetAddress() and GetPhone() functions into a common GetValue() function, we improve code reusability. Then, by inlining the GetValue() function call, we improve the readability and performance of the code.

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