go cheat sheet

goCheatSheet.go

package main

import (
	"fmt"
	"strconv"

	"github.com/afrinjamanbd/firstapp/help"
)

var (
	personname   string = "inside var block"
	personnumber int
	personextst  bool
	personage    = 34.
)

var shadow string = "shadow"

func vals() (int, int) {
	return 3, 7
}

func bitOperator() {
	a := 10             // 1010
	b := 7              // 0111
	fmt.Println(a & b)  // 0010
	fmt.Println(a | b)  // 1111
	fmt.Println(a ^ b)  // 1101
	fmt.Println(a &^ b) // 1000

}

func ikl(ert ...string) string {
	if len(ert) == 0 {
		return "empty"
	}
	return ikl(ert[1:]...) + ert[0]

}

func likl(ert ...int) int {
	if len(ert) == 0 {
		return 0
	}
	return likl(ert[1:]...) + ert[0]

}

func main() {
	var i int = 30
	var j int
	j = 40
	k := "49"
	var l float32 = 99

	fmt.Println(i, j, k, l)
	fmt.Printf("%v and %T\n", l, l)
	fmt.Println(shadow)
	shadow := "I am Shadow var"
	fmt.Println(shadow)

	l = l + 0.9
	j = int(l)
	fmt.Printf("%v and type %T\n", j, j)
	l = float32(j)
	fmt.Printf("%v and type %T\n", l, l)

	var str string
	str = strconv.Itoa(i)
	fmt.Printf("%v and type %T\n", str, str)

	bitOperator()

	//slices
	a := []int{2, 343, 74, 6}
	a = append(a, 12)
	fmt.Println(a)

	Letter := []string{""}
	fmt.Println(Letter)
	Letter = append(Letter, "hi")
	fmt.Printf("%v\n", Letter)
	Letter = append(Letter, "I am afrin")
	Letter[1] = "dff"
	fmt.Println(Letter)

	var op float64 = 3.4
	fmt.Println(op)

	//map
	mapings := make(map[string]float32)
	mapings["one"] = 3
	mapings["two"] = 2
	mapings["thre"] = 4
	fmt.Println(mapings)
	fmt.Println(mapings["two"])
	delete(mapings, "thre")
	fmt.Println(mapings)

	for _, v := range mapings {
		fmt.Println(v, " is value")
	}
	for k := range mapings {
		fmt.Println(k, "is key")
	}

	//print keys()
	keys := make([]string, 0, len(mapings))
	for k := range mapings {
		keys = append(keys, k)
	}
	fmt.Println(keys)

	w := Dosomething(k)
	fmt.Println(w)

	help.Great()

	fmt.Println(ikl("1", "2", "3"))

	var wo int
	var bird string

	fmt.Scan(&bird, &wo)
	fmt.Println(bird)

	fmt.Println(wo)

}