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
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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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