codewars/go/simple-app/main.go

package main

import (
	"fmt"

	"github.com/mitchellh/mapstructure"
)

type myStruct struct {
	X, Y int
}

func (p myStruct) method() {
	fmt.Println(p.X)
	fmt.Println(p.Y)
}

func (p *myStruct) methodPtr() {
	fmt.Println(p.X)
	fmt.Println(p.Y)
}

type Point struct {
	X int
	Y int
}

func main() {
	/*
		http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
			fmt.Fprintf(w, "Hello world")
		})
		http.ListenAndServe(":9000", nil)
	*/

	//test2()
	// test3()
	// test4()
	// test5()
	// test6()
	// test7()
	test8()
}

func test1() {
	var name string = "Dmitry"
	var age int = 23
	var c = fmt.Sprintf("My name is %s and ma age is %d", name, age)
	fmt.Println(c)
}

func test2() {
	for i := 0; i < 10; i++ {
		fmt.Println(i)
	}
}

func test3() {
	s1 := myStruct{
		X: 1,
		Y: 2,
	}

	s2 := myStruct{X: 123, Y: 23434}

	//ptr := &s2

	s1.method()
	s2.methodPtr()
}

func test4() {
	var a [2]string
	a[0] = "hello"
	a[1] = "world"

	numbers := [...]int{1, 2, 3}

	fmt.Println(a)
	fmt.Println(numbers)

	// Слайсы. Не имеют фиксированной длины
	letters := []string{"a", "b", "c"}
	letters[1] = "sadfasd"
	letters = append(letters, "new element", "werwe")

	// Пустой слайс
	createSlice := make([]string, 3)

	fmt.Println(letters)
	fmt.Println(len(createSlice))
	fmt.Println(cap(createSlice))
}

func test5() {
	animalArr := [4]string{
		"dog",
		"cat",
		"giraffe",
		"elephant",
	}

	/*
		animalSlic := []string{
			"dog",
			"cat",
			"giraffe",
			"elephant",
		}
	*/
	a := animalArr[0:2]
	fmt.Println(a)

	b := animalArr[1:3]
	fmt.Println(b)

	b[0] = "123"
	fmt.Println(a)
	fmt.Println(animalArr)
}

func test6() {
	arr := []string{"a", "b", "c"}
	for i, l := range arr {
		fmt.Println(i, l)
	}

	for _, l := range arr {
		fmt.Println(l)
	}
}

func test7() {
	pointMap := map[string]Point{}
	otherMap := map[string]Point{
		"b": {X: 23, Y: 12},
	}
	otherPointMap := make(map[int]Point)

	pointMap["a"] = Point{
		X: 1,
		Y: 2,
	}

	fmt.Println(pointMap)
	fmt.Println(pointMap["a"])

	otherPointMap[1] = Point{X: 3, Y: 7}
	fmt.Println(otherPointMap[1])

	fmt.Println(otherMap["b"])

	key := 2
	value, ok := otherPointMap[key]
	if ok {
		fmt.Printf("key=%d exist in map", key)
		fmt.Println(value)
	} else {
		fmt.Printf("key=%d does exist in map", key)
		fmt.Println(value)
	}
}

func test8() {
	pointsMap := map[string]int{
		"X": 1,
		"Y": 2,
	}

	p1 := Point{}
	mapstructure.Decode(pointsMap, &p1)
	fmt.Println(p1)

	for k, v := range pointsMap {
		fmt.Println(k)
		fmt.Println(v)
	}
}