Golang function design principles and specifications

Go function design principles include: readability (use meaningful names, short function bodies, and avoid nested functions), maintainability (error handling, value passing, and input validation) and reusability (package grouping) , interface definitions and docstrings). Following these principles helps you write clear, maintainable, and reusable Go functions. This will greatly improve code quality and development efficiency.

Go function design principles and specifications

In Golang, good function design principles are adopted to write readable and maintainable files. and reusable code are crucial. Here are some key principles:

Principle 1: Readability

• Use meaningful function names.
• Function bodies should be short and focused.
• Avoid using nested functions as they can make the code difficult to understand.

Case:

// 计算圆的面积
func AreaOfCircle(radius float64) float64 {
    return math.Pi * radius * radius
}

// 错误示例（可读性差）
func area(r float64) float64 {
    return 3.14 * r * r
}

Principle 2: Maintainability

• Use error handling to be elegant Handle errors appropriately.
• Pass function parameters as values ​​rather than pointers to avoid accidental modifications.
• Validate input to ensure the function receives valid data.

Case:

// 计算两数之和，返回错误如果输入为负数
func Sum(a, b int) (int, error) {
    if a < 0 || b < 0 {
        return 0, errors.New("invalid input: negative numbers")
    }
    return a + b, nil
}

Principle 3: Reusability

• Group related functions into in a package or module.
• Use interfaces to define the public behavior of functions to achieve polymorphism.
• Use docstrings to describe the function's purpose, parameters, and return values.

Case:

// 定义一个计算几何形状面积的接口
type Shape interface {
    Area() float64
}

// 定义一个计算圆形面积的类型
type Circle struct {
    Radius float64
}

func (c Circle) Area() float64 {
    return math.Pi * c.Radius * c.Radius
}

// 使用接口计算各种形状的面积
func CalculateArea(shapes []Shape) float64 {
    var totalArea float64
    for _, shape := range shapes {
        totalArea += shape.Area()
    }
    return totalArea
}

By following these principles, you can write Go functions that are clear, maintainable, and reusable. This will greatly improve your code quality and development efficiency.

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