golang array to map

In the Go language, it is sometimes necessary to convert an array into a map type. This article will introduce how to implement this function.

An array is a set of data types arranged in a certain order, while map is a data type stored in the form of key-value pairs. Arrays can access elements using subscripts, while maps require keys to access values. In some scenarios, we need to convert the array into a map type to more conveniently access the elements.

For example, we have an array with a length of 5, which stores the names and corresponding grades of 5 students. We hope to convert it into a map type so that we can quickly find the corresponding grades based on the student's name.

First, we need to define a type to store the names and grades of students:

type Student struct {
    Name  string
    Score int
}

Then, we create an array of length 5 to store the names and grades of 5 students:

students := [5]Student{
    {Name: "张三", Score: 90},
    {Name: "李四", Score: 85},
    {Name: "王五", Score: 78},
    {Name: "赵六", Score: 92},
    {Name: "钱七", Score: 88},
}

Then, we define a map type, using the student name as the key and the student grade as the value:

scores := make(map[string]int)

Next, we traverse each element in the array, using the student name as the key, and the student The grades are stored in scores as values:

for _, student := range students {
    scores[student.Name] = student.Score
}

Finally, we can find the corresponding grades in scores according to the student’s name:

score, ok := scores["张三"]
if ok {
    fmt.Printf("张三的成绩为：%d
", score)
} else {
    fmt.Println("未找到张三的成绩")
}

The complete code is as follows:

package main

import "fmt"

type Student struct {
    Name  string
    Score int
}

func main() {
    students := [5]Student{
        {Name: "张三", Score: 90},
        {Name: "李四", Score: 85},
        {Name: "王五", Score: 78},
        {Name: "赵六", Score: 92},
        {Name: "钱七", Score: 88},
    }

    scores := make(map[string]int)
    for _, student := range students {
        scores[student.Name] = student.Score
    }

    score, ok := scores["张三"]
    if ok {
        fmt.Printf("张三的成绩为：%d
", score)
    } else {
        fmt.Println("未找到张三的成绩")
    }
}

Output The result is:

张三的成绩为：90

Through the above code example, we can see that converting an array to a map is very simple. You only need to define the key-value pair type, create the map object, traverse the array, and fill the elements into the map.

Summary:

• In Go language, you can convert an array into a map type by traversing it.
• During the conversion process, the key-value pair type and map object need to be defined.
• After conversion, you can quickly find the corresponding value based on the key.

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