package main

import (
	"errors"
	"fmt"
	"testing"
)

func Test_1(t *testing.T) {
	type T struct {
		A string
		B []string
	}

	x := T{"煎鱼", []string{"上班"}}

	y := x
	y.A = "咸鱼"
	y.B[0] = "下班"

	fmt.Println(x)
	fmt.Println(y)

	/* slice浅拷贝
	{煎鱼 [下班]}
	{咸鱼 [下班]}*/
}

func Test_2(t *testing.T) {
	x := [3]int{1, 2, 3}

	func(arr [3]int) {
		arr[0] = 7
		fmt.Println(arr)
	}(x)

	fmt.Println(x)
}

func Test_3(t *testing.T) {
	x := []int{1, 2, 3}

	func(arr []int) {
		arr[0] = 7
		fmt.Println(arr)
	}(x)

	fmt.Println(x)
}

func Test_4(t *testing.T) {
	m := map[string]string{
		"1": "1",
		"2": "2",
		"3": "3",
	}

	for k, v := range m {
		fmt.Printf("%v %v | ", k, v)
	}
	fmt.Printf("\n")
	for k, v := range m {
		fmt.Printf("%v %v | ", k, v)
	}
	fmt.Printf("\n")
	for k, v := range m {
		fmt.Printf("%v %v | ", k, v)
	}
}

func Foo() (err error) {
	if err := errors.New("error testing"); err != nil {
		return err
	}
	return
}
func Test_5(t *testing.T) {
	err := Foo()
	fmt.Println(err.Error())
}