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How to realize the random sorting of golang array? in view of this problem, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible method.

Preface

At present, due to the demand for recommended data, the data obtained in the database need to be randomly sorted and returned to the user. Considering that there are two ways to use it, one is through the database order by rand (), and the other is the code processing that needs to be used in this article.

The specific implementation steps are as follows

1. Import the library

The code is as follows:

Import ("fmt"math/rand"time") 2. Assemble the data and sort it (option 1)

The code is as follows:

Type CategoryEntity struct {GrouponId int64 / / regiment ID MerchandiseId int64 / / Commodity ID CategoryId int64 / / Classification ID CategoryTitle string / / Classification name} func main () {data: = make ([] CategoryEntity, 10) data [0] = CategoryEntity {GrouponId: 0, MerchandiseId: 1117891, CategoryId: 726, CategoryTitle: "vegetables"} data [1] = CategoryEntity {GrouponId: 1, MerchandiseId: 1110162, CategoryId: 1505, CategoryTitle: "seasoning"} data [2] = CategoryEntity {GrouponId: 2, MerchandiseId: 1117822, CategoryId: 746 CategoryTitle: "fruit"} data [3] = CategoryEntity {GrouponId: 3, MerchandiseId: 1115770, CategoryId: 1408, CategoryTitle: "personal care"} data [4] = CategoryEntity {GrouponId: 4, MerchandiseId: 1116528, CategoryId: 732, CategoryTitle: "meat"} data [5] = CategoryEntity {GrouponId: 5, MerchandiseId: 1116526, CategoryId: 727, CategoryTitle: "snack food"} data [6] = CategoryEntity {GrouponId: 6, MerchandiseId: 1117188, CategoryId: 728, CategoryTitle: "Grain and oil seasoning"} data [7] = CategoryEntity {GrouponId: 7 MerchandiseId: 1117379, CategoryId: 726, CategoryTitle: "vegetables"} data [8] = CategoryEntity {GrouponId: 8, MerchandiseId: 1118166, CategoryId: 1005, CategoryTitle: "Home Department Store"} data [9] = CategoryEntity {GrouponId: 9, MerchandiseId: 1117377, CategoryId: 746, CategoryTitle: "fruits"} fmt.Println ("before Random:", data) / / if rand.Seed (seed int64) is not used For each run, the random number will be the same as rand.Seed (time.Now (). Unix ()) / / using rand.Shuffle. The slice will be randomized and returned to rand.Shuffle (len (data), func (I, j int) {data [I], data [j] = data [j], data [I]}) fmt.Println ("Random:", data)} 3. Assemble the data and sort it (option 2)

The code is as follows:

Type CategoryEntity struct {GrouponId int64 / / regiment ID MerchandiseId int64 / / Commodity ID CategoryId int64 / / Classification ID CategoryTitle string / / Classification name} func main () {data: = make ([] CategoryEntity, 10) data [0] = CategoryEntity {GrouponId: 0, MerchandiseId: 1117891, CategoryId: 726, CategoryTitle: "vegetables"} data [1] = CategoryEntity {GrouponId: 1, MerchandiseId: 1110162, CategoryId: 1505, CategoryTitle: "seasoning"} data [2] = CategoryEntity {GrouponId: 2, MerchandiseId: 1117822, CategoryId: 746 CategoryTitle: "fruit"} data [3] = CategoryEntity {GrouponId: 3, MerchandiseId: 1115770, CategoryId: 1408, CategoryTitle: "personal care"} data [4] = CategoryEntity {GrouponId: 4, MerchandiseId: 1116528, CategoryId: 732, CategoryTitle: "meat"} data [5] = CategoryEntity {GrouponId: 5, MerchandiseId: 1116526, CategoryId: 727, CategoryTitle: "snack food"} data [6] = CategoryEntity {GrouponId: 6, MerchandiseId: 1117188, CategoryId: 728, CategoryTitle: "Grain and oil seasoning"} data [7] = CategoryEntity {GrouponId: 7 MerchandiseId: 1117379, CategoryId: 726, CategoryTitle: "vegetables"} data [8] = CategoryEntity {GrouponId: 8, MerchandiseId: 1118166, CategoryId: 1005, CategoryTitle: "Home Department Store"} data [9] = CategoryEntity {GrouponId: 9, MerchandiseId: 1117377, CategoryId: 746, CategoryTitle: "fruits"} fmt.Println ("before Random:", data) / / if rand.Seed (seed int64) is not used For each run, the random number will be the same as rand.Seed (time.Now (). Unix ()) length: = len (data) for I: = 0 I < length; iTunes + {exchange (data, rand.Intn (length), I)} fmt.Println ("after Random:", data)} / / Exchange data func exchange (data [] CategoryEntity, I, j int) {data [I], data [j] = data [j], data [I]}

The whole is relatively simple, but there are two points to pay attention to:

The way rand is used in 1:golang. If you don't use rand.Seed (seed int64), you will get the same random number each time you run it.

2: one scheme uses the rand.Shuffle+ anonymous function to randomize the slice and return it.

3: solution 2 uses the unique array exchange method of golang:

Func exchange (data [] CategoryEntity, I, j int) {data [I], data [j] = data [j], data [I]} on how to carry out random sorting of golang arrays, this is the answer shared here. I hope the above content can be of some help to everyone. If you still have a lot of doubts to be solved, you can follow the industry information channel for more related knowledge.

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