Basics of golang -- the difference between slicing and array

The difference between slices and arrays ：

●　 Slice is a pointer type , Arrays are value types

●　 The length of the array is fixed , Slicing is not （ Slices are dynamic arrays ）

●　 Slice has one more attribute than array ： Capacity （cap)

●　 At the bottom of the slice is an array

Slice is a pointer type , Arrays are value types , So what's the difference ？

Example

package main

import "fmt"

func main() {
    

	//  section 
	numbers := []int{
    1, 2, 3, 4, 5, 6}
	for index, value := range numbers {
    
		if index == len(numbers)-1 {
    
			numbers[0] += value
		} else {
    
			numbers[index+1] += value
		}
	}
	fmt.Println(" section ：", numbers)


	//  Array 
	numbers2 := [...]int{
    1, 2, 3, 4, 5, 6}
	for index, value := range numbers2 {
    
		if index == len(numbers2)-1 {
    
			numbers2[0] += value
		} else {
    
			numbers2[index+1] += value
		}
	}
	fmt.Println(" Array ：", numbers2)
}

section , Each element becomes the sum of the changed value of the previous element and the current element ;
Array , Each element becomes the sum of the current element and the previous element .

The result is ：

 section ： [22 3 6 10 15 21]
 Array ： [7 3 5 7 9 11]

analysis ：

for loop ,numbers The element in is {1,2,3,4,5,6} . receive for The variables of the loop are index and value ,index All are [0,1,2,3,4,5].

and value Different , The array is Value passed , So when traversing an array ,value by {1,2,3,4,5,6} ;

The slice passes The pointer , So add up every time , It's all changed Value accumulation .