package slice_test

import "testing"

// 切片定义
func TestSlienceInit(t *testing.T) {
	var s0 []int
	t.Log(len(s0), cap(s0))
	s0 = append(s0, 1)
	t.Log(len(s0), cap(s0))

	s1 := []int{1, 2, 3, 4}
	t.Log(len(s1), cap(s1))

	s2 := make([]int, 3, 5)
	t.Log(len(s2), cap(s2))
	t.Log(s2[0], s2[1], s2[2])
	s2 = append(s2, 4)
	t.Log(len(s2), cap(s2))
	t.Log(s2[0], s2[1], s2[2], s2[3])
}

// 切片增长演示
func TestSliceGrowing(t *testing.T) {
	s := []int{}
	for i := 0; i < 10; i++ {
		s = append(s, i)
		t.Log(len(s), cap(s))
	}
}

// 切片的共享内存 演示
func TestSliceShareMemory(t *testing.T) {
	letter := []string{"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "L"}
	letter2 := letter[3:6]
	t.Log(letter2, len(letter2), cap(letter2))
	l3 := letter[5:8]
	t.Log(l3, len(l3), cap(l3))
	l3[0] = "U"
	t.Log(letter2)
	t.Log(letter)
}

// 切片不能比较
func TestSliceCompare(t *testing.T) {
	// a := []int{1, 2, 3, 4}
	// b := []int{1, 2, 3, 4}
	// if a == b {
	// 	t.Log("equals")
	// }
}