Go Notes

go.go

/*
STRING OPERATIONS
package strings
*/
exStr := "Hello World"
strings.Contains(exStr, "lo") //returns true/false
strings.Index(exStr, "lo") //returns 3
strings.Count(exStr, "o") //returns 2
strings.Replace(exStr, "l", "_", 3) //here first 3 l's is replaced with _
strings.Fields(exStr) //splits on space 
strings.Split(exStr, "o") //splits on a given character i.e splits on "o"

strArr := []string {"c", "b", "a"}
strings.Join(strArr, "-")//joins the array values with - seperator
//package sort
sort.Strings(strArr) //sorts the string
//package strconv
strInt := "100"
strconv.ParseInt(str, 0, 8)//string 100->int 100, 8: size of char is 8 bits


/*
FILE IO
packages
fmt
os
log
io/ioutil
*/
file, err := os.Create("sampa.txt")
	
if err != nil{
	log.Fatal(err)
}
	
file.WriteString("Amit")
file.Close()

stream, err := ioutil.ReadFile("sampa.txt")

if err != nil{
	log.Fatal(err)
}
	
fmt.Println(string(stream))


/*
  HTTP server
  package net/http
*/
http.HandleFunc("/", handler)
http.ListenAndServe(":8080", nil)

func handler(w http.ResponseWriter, r *http.Request){
  fmt.Println(w, "hello world")
}