File handling in Go

 File handling in Go

Go has built-in support for reading and writing files.

The os package provides functions for opening, closing, reading, and writing files.

f, err := os.Create("data.txt")

if err != nil {

    // handle the error

}

defer f.Close()

_, err = f.WriteString("Hello, world!\n")

if err != nil {

    // handle the error

}

data := make([]byte, 100)

n, err := f.Read(data)

if err != nil {

    // handle the error

}

fmt.Println(string(data[:n])) // prints Hello, world!

In this example, we create a new file called data.txt by using the os.Create() function. We write a string to the file by using the f.WriteString() function, and we read the contents of the file into a byte slice by using the f.Read() function.

We also use the defer keyword to ensure that the file is closed when the function returns, regardless of whether an error occurred.