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Golang Program to Create an Interface Named Writer that Defines a Write Method
In this Golang article we will learn to create an interface named writer that defines a write method write method for file type as well as writer interface and filet type.
Syntax
data := []byte("Hello, World!")
It is used to declare a byte slice in go language.
data : it is a variable declaration for a var named data.
[]byte: the type of variable “data” as a byte slice.
it is used to convert the string literal into byte slice.
Example 1
In this example, we are going to interface named writers that include a write() method. The code given below demonstrates writing data into a file by calling write method on file object.
package main
import "fmt"
type Writer interface {
Write(p []byte) (n int, err error)
}
type File struct {
}
func (f *File) Write(p []byte) (n int, err error) {
return len(p), nil
}
func main() {
file := &File{}
data := []byte("Hello, World!")
bytesWritten, err := file.Write(data)
if err != nil {
fmt.Println("Error:", err)
return
}
fmt.Println("Bytes written:", bytesWritten)
}
Output
Bytes Written : 13
Example 2
In this method instead of creating a struct we can use the built in os.file() type that satisfies the writer interface. The below code demonstrates the use of interface and struct to write data into a file.
package main
import "fmt"
type Writer interface {
Write(p []byte) (n int, err error)
}
type File struct {
}
func (f *File) Write(p []byte) (n int, err error) {
return len(p), nil
}
func main() {
file := &File{}
data := []byte("Hello, World!")
bytesWritten, err := writeToFile(file, data)
if err != nil {
fmt.Println("Error:", err)
return
}
fmt.Println("Bytes written:", bytesWritten)
}
func writeToFile(writer Writer, data []byte) (int, error) {
return writer.Write(data)
}
Output
Bytes Written : 13
Conclusion
In this article we have discussed how we can create an interface named writer that defines a write method. We have explored different examples of writing data to a file using the Writer interface and the File type emphasized the advantages of interfaces and their role in fostering code reusability and abstraction.
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