What are the common functions supported by Go language?

Go language, as an open source statically typed programming language, has a rich standard library and powerful functions. In the Go language, there are many commonly used functions and methods that can help us simplify the code and improve programming efficiency. The following will introduce several commonly used functions in the Go language and give specific code examples.

1. Printf function in fmt package

fmt package is a standard package for formatting input and output in Go language. The Printf function in it can output the content to in the standard output stream. The following is a sample code:

package main

import "fmt"

func main() {
    name := "Alice"
    age := 20
    fmt.Printf("Name: %s, Age: %d
", name, age)
}

In this example, the Printf function outputs the values ​​of name and age to the standard output stream according to the formatted string.

2. The Contains function in the strings package

The strings package is a standard package for processing strings in the Go language. The Contains function is used to determine whether a string contains another substring. string. The following is a sample code:

package main

import (
    "fmt"
    "strings"
)

func main() {
    str := "Hello, world!"
    sub := "world"
    
    if strings.Contains(str, sub) {
        fmt.Printf("The string '%s' contains the substring '%s'
", str, sub)
    } else {
        fmt.Printf("The string '%s' does not contain the substring '%s'
", str, sub)
    }
}

In this example, the Contains function determines whether str contains the sub substring, and outputs the corresponding prompt information based on the result.

3. The ReadFile function in the ioutil package

The ioutil package is a standard package in the Go language for reading file contents. The ReadFile function in it is used to read the file contents of the specified path and Returns a byte array. Here is a sample code:

package main

import (
    "fmt"
    "io/ioutil"
)

func main() {
    data, err := ioutil.ReadFile("example.txt")
    if err != nil {
        fmt.Println("Error reading file:", err)
        return
    }

    fmt.Println("File content:")
    fmt.Println(string(data))
}

In this example, the ReadFile function reads the contents of the example.txt file and converts it into a string output.

The above are sample codes for some commonly used functions in the Go language. These functions can simplify the code, improve efficiency, and help developers better program in the Go language.

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