How to distinguish golang functions and methods?

The difference between Go functions and methods is that the function is defined outside the package and does not receive a receiver; while the method is defined within the type and receives the type receiver as the first parameter.

#How to distinguish between Go functions and methods?

In the Go language, although functions and methods look similar, there are essential differences between them.

Function

• is defined outside the package scope and can be called directly.
• Does not accept type receivers.

func Greet(name string) string {
    return "Hello, " + name + "!"
}

Method

• is defined within the type and can only be called through type instances.
• Receive type receiver as first parameter.

type Person struct {
    Name string
}

func (p Person) Greet() string {
    return "Hello, " + p.Name + "!"
}

Practical case

The following code demonstrates the difference between functions and methods:

package main

import "fmt"

func main() {
    // 调用函数
    greeting1 := Greet("Alice")
    fmt.Println(greeting1) // 输出：Hello, Alice!

    // 实例化类型并调用方法
    alice := Person{Name: "Alice"}
    greeting2 := alice.Greet()
    fmt.Println(greeting2) // 输出：Hello, Alice!
}

func Greet(name string) string {
    return "Hello, " + name + "!"
}

type Person struct {
    Name string
}

func (p Person) Greet() string {
    return "Hello, " + p.Name + "!"
}

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