/docs/standard-library/Recent content in Standard Library on Go Basics TrainingHugo -- gohugo.ioen/docs/standard-library/io/Mon, 01 Jan 0001 00:00:00 +0000/docs/standard-library/io/Basics 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 package main import ( "fmt" "log" "os" ) func main() { const filename = "/tmp/file.txt" err := os.WriteFile(filename, []byte("Hello, file system\n"), 0644) if err != nil { log.Fatal(err) } content, err := os.ReadFile(filename) if err != nil { log.Fatal(err) } fmt.Printf("%s", content) } Output: Hello, file system Reader/Writer The above example of reading a file loads the whole file into memory./docs/standard-library/json/Mon, 01 Jan 0001 00:00:00 +0000/docs/standard-library/json/Encoding Go allows us to encode structs to json by using json.Marshal . 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 package main import ( "encoding/json" "fmt" "os" ) type User struct { Name string FullName string Followers int } func main() { user := User{ Name: "Alice", FullName: "Alice Nyffenegger", Followers: 44, } output, err := json./docs/standard-library/http-client/Mon, 01 Jan 0001 00:00:00 +0000/docs/standard-library/http-client/The Go standard library offers a HTTP package which provides a server and a client. In the following sections we learn how we can use the HTTP client. Quick start The following example shows how we can perform a GET request and print the body to the standard output. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 package main import ( "fmt" "io" "net/http" "os" ) func main() { resp, err := http./docs/standard-library/http-server/Mon, 01 Jan 0001 00:00:00 +0000/docs/standard-library/http-server/Quick start Go allows us to start a simple HTTP server with minimal code: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 package main import ( "fmt" "net/http" "os" ) func helloHandler(w http.ResponseWriter, r *http.Request) { fmt.Fprintln(w, "Hello World") } func main() { http.HandleFunc("/hello", helloHandler) err := http.ListenAndServe(":8080", nil) if err != nil { fmt.Println(err) os.Exit(1) } } Now you can access http://localhost:8080/hello ./docs/standard-library/time/Mon, 01 Jan 0001 00:00:00 +0000/docs/standard-library/time/Basics Time is represented with the time.Time struct. The output in the examples below is generated by the Go playground . The Go playground uses a static time to achieve optimal caching performance. 1 2 3 4 5 6 7 8 9 10 11 package main import ( "fmt" "time" ) func main() { time := time.Now() fmt.Println(time) } Output: 2009-11-10 23:00:00 +0000 UTC m=+0.000000001 Parsing To parse a string to time.