Search standard Go packages here: https://pkg.go.dev/std
What are packages belong to golang.org/x:
These packages are part of the Go Project but outside the main Go tree. They are developed under looser compatibility requirements than the Go core. Install them with “go get”.
List of commonly used packages
fmt:
Common use placeholder: %q, %v, %d, %c(one string), %T(type), %p(address).
fmt.Errorf()
fmt.Sprintf()
logrus:
structured logger for Go
strings:
strings.LastIndex(s,“/”), strings([]byte{‘a’,‘b’})
strconv:
strconv.Itoa(55), strconv.Atoi(“1”), strconv.ParseInt(“23”, 10, 64)
bytes:
bytes.Buffer, []byte(“hello”)
unicode/utf8:
utf8.RuneCountInString(“Hello, 世界”)
kubernetes:
https://github.com/kubernetes/kubernetes
kubernetes/client-go:
https://pkg.go.dev/k8s.io/client-go/kubernetes
os:
os.Args, os.Stdin, os.Open, os.Exit(1)
flag:
extract options/flags from CLI, like Python Click
cobra:
powerful CLI for modern app: k8s, etcd, istio, etc
viper:
a complete configuration solution for Go app
path/filepath
httpRouter
net/http:
minimal server, http.Handlefunc(x,handler), http.ListenAndServe(x,x)
func handler(w http.ResponseWriter, r *http.Request) {}
net/url
context
encoding/json
https://pkg.go.dev/encoding/json
json.Marshal(), json.MarshalIndent()
yaml:
gopkg.in/yaml.v3
math/rand:
rand is a subdirectory in math package.
bufio:
Some help for textual I/O: bufio.NewScanner(os.Stdin), bufio.NewReader(os.Stdin)
runtime
runtime.Stack()
io/ioutil:
ioutil.ReadAll()
sync:
sync.Mutex
sort:
sort.Interface
sort.Strings(<[]string>)
sort.Ints(<[]int>)
sort.Reverse(sort.IntSlice(<[]int>))
sort.IsSorted()
text/template
text/tabwriter
html/template
errors
time:
time.Now(), time.Since(xx).Seconds()
testify
hugo:
a static site website generator