What is the difference between golang array and slice?

The difference between arrays and slices in golang:

● Slices are pointer types, arrays are value types

● Arrays The length is fixed, but slices are not (slices are dynamic arrays)

● Slices have one more attribute than arrays: capacity (cap)

● The bottom layer of slices is arrays

Related recommendations: golang tutorial

Since one is a pointer type and the other is a value type, where is the difference?

Look at this example

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

The result is:

[22 3 6 10 15 21]

Replace the slice with an array:

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

The result is:

[7 3 5 7 9 11]

It’s obvious: after traversing, each element in the array becomes the sum of the current element and the previous element; the same is true for slicing, except that each element becomes the changed value of the previous element and the sum of the current element. and.

Analysis: During the for loop, the elements in numbers are {1,2,3,4,5,6}. The variables that receive the for loop are i and e, and i are both [0,1,2,3,4,5]. But e is different, the array is passed by value, so when traversing the array, e is {1,2,3,4,5,6}; slicing passes a pointer, so every time it is accumulated, the changed value is accumulated.

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