How to customize implementation function in golang?

To implement a custom function in Go, you need to use the func keyword followed by the function name, parameter list and return type (optional). A custom function is called by calling the function name and supplying the appropriate parameters. Custom functions can be used for a variety of tasks, such as processing data, formatting output, or creating reusable code blocks.

How to customize the implementation function in Go

Introduction

In Go , we can implement our custom functions to add custom functionality and flexibility to our applications. Custom functions allow us to create reusable blocks of code, perform specific tasks, or perform complex operations.

Create a custom function

To create a custom function, we use the func keyword, followed by the function name, parameter list if needed ) and return type (if needed). For example:

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

This function accepts a string parameter named name and returns a string containing the greeting.

Call a custom function

To call a custom function, we just use the function name and the appropriate parameters just like calling a standard library function. For example:

name := "John"
msg := greet(name)
fmt.Println(msg) // 输出: "Hello, John!"

Practical case

Suppose we have a Product structure, which contains Name and Price Field. We want to create a function that formats product information and prints it on the terminal.

We can create a custom function like this:

import "fmt"

type Product struct {
    Name string
    Price float64
}

func formatProduct(p Product) {
    fmt.Printf("Product: %s (%f)\n", p.Name, p.Price)
}

We can call the formatProduct function like this and pass the Product instance:

product := Product{Name: "iPhone 13", Price: 999.00}
formatProduct(product) // 输出: "Product: iPhone 13 (999.00)"

Other notes

• Function parameters and return values ​​can be of any type, including structures, slices, and custom types.
• Functions can have multiple parameters and return values.
• Functions can declare an explicit return type or use automatic inference.
• Custom functions can be imported from external packages or defined in local scope.

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