What are the forms of map assignment in go language?

The forms of map assignment in Go language are: 1. Use the "make" function to create and initialize the map, use the "make" function to create an empty map and assign the value directly; 2. Use literals to create and initialize the map, Use "{}" to directly create and initialize a map; 3. Use multiple assignment statements to assign map values, and use multiple assignment statements to assign key-value pairs to the map one by one; 4. Use a for loop to assign map values, and use for Loop through a slice or array and assign its elements to map key-value pairs, etc.

The operating environment of this article: Windows 10 system, go1.20 version, DELL G3 computer.

Go language map assignment tutorial

Map in Go language is an unordered collection of key-value pairs used to store and retrieve data. In the Go language, there are many forms that can be used to perform Map assignment operations.

1. Use the make function to create and initialize the Map: You can use the make function to create an empty Map and assign values ​​directly.

   // 创建并初始化一个Map
   m := make(map[string]int)
   m["apple"] = 1
   m["banana"] = 2
   m["orange"] = 3

2. Use literals to create and initialize a Map: You can use curly braces `{}` to directly create and initialize a Map.

   // 创建并初始化一个Map
   m := map[string]int{
       "apple": 1,
       "banana": 2,
       "orange": 3,
   }

3. Use multiple assignment statements for Map assignment: You can use multiple assignment statements to assign values ​​to the key-value pairs of the Map one by one.

   // 创建一个空的Map
   m := map[string]int{}
   
   // 逐个赋值给Map的键值对
   m["apple"] = 1
   m["banana"] = 2
   m["orange"] = 3

4. Use for loop for Map assignment: You can use for loop to traverse a slice or array and assign its elements to the key-value pairs of the Map.

    // 创建一个空的Map
   m := map[string]int{}
   
   // 切片或数组用于遍历赋值
   fruits := []string{"apple", "banana", "orange"}
   quantities := []int{1, 2, 3}
   
   // 使用for循环进行Map赋值
   for i := 0; i < len(fruits); i++ {
       m[fruits[i]] = quantities[i]
   }

5. Use range traversal for Map assignment: You can use the range keyword to traverse a slice or array and assign its elements to the key-value pairs of the Map.

     // 创建一个空的Map
   m := map[string]int{}
   
   // 切片或数组用于遍历赋值
   fruits := []string{"apple", "banana", "orange"}
   quantities := []int{1, 2, 3}
   
   // 使用range遍历进行Map赋值
   for idx, fruit := range fruits {
       m[fruit] = quantities[idx]
   }

The above are several common forms of Map assignment in Go language. You can choose the appropriate method to perform the Map assignment operation according to actual needs. No matter which form you choose, you can assign values ​​to the key-value pairs of the Map.

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