Let’s talk about how to implement array intersection in Golang

As Go language becomes more and more widely used in the Internet field, array operations in Golang language have also become a problem often involved in development. Among them, the intersection of arrays in Golang is also one of the common operations. Let us learn how to implement the intersection of arrays in Golang.

1. Golang array

Golang array is composed of continuous elements. The type of elements can be numbers, strings, Boolean values, etc. In the Golang language, the length of the array is also fixed. Once the array is defined, its length cannot be modified. According to the grammar of the Golang language, when defining an array, you need to specify the array type and the length of the array. The example is as follows:

var arr1 [3]int //定义一个包含三个整数的数组
var arr2 [2]string //定义一个包含两个字符串的数组

2. Find the intersection of Golang arrays

Let’s introduce the search method in Golang How to intersect two arrays. Suppose we have two arrays arr1 and arr2, and we need to find their intersection. So, how to achieve it? We can use a for loop to traverse the elements in each array and store the elements in a map. According to the characteristics of the map, we can easily achieve intersection.

The sample code is as follows:

func intersection(arr1 []int, arr2 []int) []int {
    m := make(map[int]bool)
    res := make([]int, 0)
    for _, v := range arr1 {
        m[v] = true
    }
    for _, v := range arr2 {
        if m[v] {
            res = append(res, v)
        }
    }
    return res
}

In this code, the intersection function receives two array parameters arr1 and arr2, uses the make function to create a map m, and then we traverse arr1 All elements of are stored in map m. After that, we traverse all the elements in arr2 to determine whether these elements exist in map m. If they exist, it means that this element exists in both arr1 and arr2. We add it to the res array and finally return the res array. Can.

The test code is as follows:

func main() {
    arr1 := []int{1, 2, 3, 4, 5}
    arr2 := []int{2, 4, 6, 8, 10}
    fmt.Println(intersection(arr1, arr2))
}

The output result is:

[2 4]

We can see that the program returns the intersection of arr1 and arr2, which is 2 and 4.

3. Summary

Through the above introduction, we understand the definition of Golang array and the implementation method of intersection of Golang array. For developers, the skill of intersection of Golang arrays is a necessary skill. Mastering these methods can also better apply these skills in development and improve the quality and efficiency of the code.

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