Go基础--06 数组与切片

数组

package array

import "testing"

func TestArrayInit(t *testing.T){
	var arr = [...]int{1,2,3}
	arr1 := [3]int{1,2}
	for i:=0;i<3;i++{
		t.Log(arr[i])
	}
	t.Log(arr1[1:])
}

func TestArrayLoop(t *testing.T){
	arr3 := [...]int{1,2,3}
	for _,data := range(arr3){
		t.Log(data)
	}
	t.Log(arr3[:len(arr3)])
}

切片内部结构

package slice

import "testing"

func TestSliceInit(t *testing.T) {
	var s0 []int
	t.Log(len(s0))
	t.Log(cap(s0))
	s0 = append(s0,1)
	t.Log(len(s0))
	t.Log(cap(s0))

	s1:=[]int{11,22}
	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[3],s2[4]) //只初始化元素个数
	s2 = append(s2,5)
	t.Log(len(s2),cap(s2))

}
//切片可变长过程
func TestSliceGrowing(t *testing.T){
	s := []int{}
	for i:=0;i<10;i++{
		s = append(s,i)
		t.Log(len(s),cap(s))
	}
}

//共享空间
func TestSliceShareMemory(t *testing.T){
	year := []string{"Jan","Feb","Mar","Apr","May","Jun","Jul","Aug","Sep","Oct","Nov","Dec"}
	Q2 := year[3:6]
	t.Log(Q2,len(Q2),cap(Q2)) // 3 9
	summer := year[5:8]
	t.Log(summer,len(summer),cap(summer)) //3 7
	summer[0] = "Unkonow"
	t.Log(Q2)
}

数组与切片

1. 容量是否可伸缩

切片可伸缩

1. 是否可以进行比较 

数组可以比较，容量不可以比较，切片可以和nil比较