Learn Go language built-in methods from scratch: a practical guide

Learn the built-in methods of Go language from scratch: a practical guide

Go language is praised by many developers as a simple and efficient programming language, and the built-in methods of Go language Method is one of its strengths. This article will introduce you to a practical guide for learning the built-in methods of the Go language from scratch, helping you to understand and apply the built-in methods of the Go language more deeply.

What are built-in methods?

In the Go language, built-in methods are a series of methods and functions provided by the language itself to implement various commonly used functions. These built-in methods can be used directly in the code without the need to import any additional libraries or modules, which greatly facilitates developers' programming work.

Classification of built-in methods

The built-in methods of Go language can be divided into several main categories, including string processing, mathematical operations, set operations, file operations, etc. Next, we will introduce the commonly used built-in methods in these categories with specific code examples.

String processing method

String processing method is very commonly used in Go language, which can help developers perform various operations on strings, such as splicing, interception, replacement, etc. The following are code examples of some common string processing methods:

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "hello world"
    
    // 字符串拼接
    newStr := str + "!"
    fmt.Println(newStr)
    
    // 字符串替换
    replacedStr := strings.Replace(str, "world", "Go", -1)
    fmt.Println(replacedStr)
    
    // 字符串截取
    substr := str[6:]
    fmt.Println(substr)
}

Mathematical operation methods

The built-in methods of the Go language also include various mathematical operation methods, such as logarithms, power operations, Take the absolute value, etc. The following are code examples of some common mathematical operation methods:

package main

import (
    "fmt"
    "math"
)

func main() {
    x := 10.5
    y := -3.2
    
    // 取绝对值
    fmt.Println(math.Abs(y))
    
    // 幂运算
    fmt.Println(math.Pow(x, 2))
    
    // 对数运算
    fmt.Println(math.Log(x))
}

Set operation methods

The built-in methods of the Go language also provide a wealth of set operation methods, such as sorting slices, searching, etc. operate. The following are code examples of some common collection operation methods:

package main

import (
    "fmt"
    "sort"
)

func main() {
    nums := []int{5, 2, 4, 1, 3}
    
    // 切片排序
    sort.Ints(nums)
    fmt.Println(nums)
    
    // 切片查找
    fmt.Println(sort.SearchInts(nums, 3))
}

File operation methods

The built-in methods of the Go language also include various operation methods for files, such as reading and writing. , delete, etc. The following are code examples of some common file operation methods:

package main

import (
    "fmt"
    "os"
)

func main() {
    // 创建文件
    file, err := os.Create("test.txt")
    if err != nil {
        fmt.Println(err)
    }
    defer file.Close()
    
    // 写入内容
    file.WriteString("Hello, Go!")
    
    // 读取内容
    data, _ := os.ReadFile("test.txt")
    fmt.Println(string(data))
}

Summary

This article introduces a practical guide to learning the built-in methods of the Go language from scratch, showing the characters in specific code examples Commonly used built-in methods in multiple categories such as string processing, mathematical operations, set operations, file operations, etc. I believe that through practical exercises, you will become more proficient in using the built-in methods of the Go language and improve programming efficiency.

I hope this article can help you better master the use of the built-in methods of the Go language. Welcome to continue to study and explore in depth and continuously improve your programming skills!

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