Golang formal parameter requirements: function signature, parameter type restrictions

Golang formal parameter requirements to learn: function signature, parameter type restrictions

In the Go language, the formal parameter requirements of a function are very important, they define the function The parameters are entered and the parameter type and requirements are specified. Understanding function signatures and parameter type restrictions can help us write more robust and readable code. This article will introduce function signatures and parameter type regulations in Golang, and provide specific code examples.

Function signature

Function signature refers to the type and characteristics of the function, mainly including function name, parameter list and return value type. In Go language, function signature is defined when declaring the function, for example:

func add(a, b int) int {
    return a + b
}

In the above example, the signature of function add is func add(a, b int) int . Among them, the function name is add, the parameter list is two integer parameters a and b, and the return value type is integer type int.

Parameter type restrictions

In the Go language, we can limit the type of parameters by specifying the type of formal parameters. If the actual parameter type passed in does not match the formal parameter type, the compiler will report an error. The following is an example of parameter type restriction:

func greet(name string) {
    fmt.Println("Hello, " + name)
}

func main() {
    greet("Alice") // 正确
    greet(123)     // 报错，传入参数类型不匹配
}

In the above code, the function greet requires a string type parameter to be passed in. If an integer type is passed in, the compiler will prompt that the type does not match. mistake.

Specific code example

Next, let’s look at a more specific code example to show the use of function signatures and parameter type restrictions:

package main

import "fmt"

func greet(name string) {
    fmt.Println("Hello, " + name)
}

func add(a, b int) int {
    return a + b
}

func main() {
    greet("Alice")
    // greet(123)  // 传入错误类型，编译器会报错

    result := add(10, 20)
    fmt.Println("10 + 20 =", result)
    // add("hello", "world")  // 传入错误类型，编译器会报错
}

In the above example, we Two functions greet and add are defined, which are used to print greetings and calculate the sum of two integers respectively. In the main function, we demonstrate the correct and incorrect parameters passed in. Through the compiler's error prompts, we can better understand the parameter type requirements.

Through the introduction and examples of this article, I believe readers can better understand the concepts of function signatures and parameter type restrictions in Golang. When writing code, be sure to pass in parameters strictly in accordance with the requirements of function parameters to ensure the correctness and reliability of the code. Hope this article helps you!

The above is the detailed content of Golang formal parameter requirements: function signature, parameter type restrictions. For more information, please follow other related articles on the PHP Chinese website!