go函数make、slice、append

make

// 长度和容量都是5个元素
	array := make([]string,5)

	for i:=0;i<len(array);i++ {
		array[i] = strconv.Itoa(i) // int to string
		fmt.Printf("%d=%s \n",i,array[i])
	}

	fmt.Println()
	//长度为3个  容量为5个
	array1 := make([]string,3,5)
	for i:=0;i<len(array1);i++ { //可以访问3个元素
		array1[i] = strconv.Itoa(i) // int to string
		fmt.Printf("%d=%s \n",i,array1[i])
	}

print

0=0 
1=1 
2=2 
3=3 
4=4 

0=0 
1=1 
2=2 

slice

[start:end]

slice := [] int {1,2,3,4,5,6,7,8,9}

	slice1 := slice[2:5]
	fmt.Printf("\n")
	fmt.Printf("slice1.length=%d \n",len(slice1))
	for i:=0;i<len(slice1);i++ {
		fmt.Printf("%d=%d \n",i,slice1[i])
	}

Output

slice1.length=3 
0=3 
1=4 
2=5 

[i:j:k]

Length is ji, capacity is k-1

append

slice := [] int {1,2,3,4,5,6,7,8,9}
	fmt.Printf("start myappend =============================\n")
	// 3,4,5
	slice1 := slice[2:5]
	fmt.Printf("\n")
	fmt.Printf("slice1.length=%d \n",len(slice1))
	for i:=0;i<len(slice1);i++ {
		fmt.Printf("%d=%d \n",i,slice1[i])
	}
    // 6 变成10  7变成了11
	slice1 = append(slice1,10,11)
	fmt.Printf("\n")

	fmt.Printf("slice.length=%d \n",len(slice))
	for i:=0;i<len(slice);i++ {
		fmt.Printf("%d=%d \n",i,slice[i])
	}
	fmt.Printf("\n")
	fmt.Printf("slice1.length=%d \n",len(slice1))
	for i:=0;i<len(slice1);i++ {
		fmt.Printf("%d=%d \n",i,slice1[i])
	}

Output

start myappend =============================

slice1.length=3 
0=3 
1=4 
2=5 

slice.length=9 
0=1 
1=2 
2=3 
3=4 
4=5 
5=10 
6=11 
7=8 
8=9 

slice1.length=5 
0=3 
1=4 
2=5 
3=10 
4=11 

note

6 becomes 10 7 becomes 11