Differences between method receivers in different languages ​​and Go language method receivers

Method receivers in Go language are different from method receivers in other programming languages. In Go language: method receivers are located in the function signature, immediately after the function name. The method receiver is a value rather than a pointer, which makes it more lightweight.

Method receivers in different languages ​​and Go language method receivers

In object-oriented programming, method receivers allow us Defines a method that operates on a specific object. The syntax and usage of method receivers may vary in different languages. This article will discuss the differences between method receivers in different languages ​​and Go language method receivers.

Java

In Java, method receiver is called this keyword. It refers to the object on which the method is called:

class MyClass {
    public void myMethod() {
        System.out.println(this); // 打印调用该方法的对象
    }
}

Python

In Python, a method receiver is the first parameter of a method. It is often called self:

class MyClass:
    def my_method(self):
        print(self)  # 打印调用该方法的对象

C

In C, a method receiver is passed to a method as the implicit first argument. It is accessed using the this keyword:

class MyClass {
public:
    void myMethod() {
        std::cout << this;  // 打印调用该方法的对象
    }
};

Go

The Go language's method receivers are significantly different from other languages. The method receiver is located in the function signature, immediately after the function name:

type MyClass struct {
    // 字段
}

func (myClass MyClass) myMethod() {
    // 实现
}

In the Go language, a method receiver is a value, not a pointer. This makes method receivers in Go more lightweight and avoids null pointer checks.

Practical case

The following is an example of implementing a similar method in Go language and Python:

Go language:

type Person struct {
    Name string
}

func (p Person) Greet() {
    fmt.Printf("Hello, %s!\n", p.Name)
}

Python:

class Person:
    def __init__(self, name):
        self.name = name

    def greet(self):
        print("Hello, {}!".format(self.name))

As you can see, the method receiver in Go language is more concise because it does not require an explicit reference to the object.

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