如何在 Golang 将一张地图复制到另一张地图？
原文:https://www . geeksforgeeks . org/如何将一幅地图复制到另一幅地图中 golang/
Golang 中的地图 是无序的键值对的集合。它被广泛使用，因为它提供了快速的查找和值，可以在键的帮助下检索、更新或删除。在地图中，您可以使用 Go 语言提供的 for loop 将地图复制到另一张地图。在 for 循环中，我们用元素获取索引值 1 乘 1，并将其分配给另一个映射。
语法:
for key, value := range originalMap{
}
让我们借助例子来讨论这个概念:
例 1:
// Go program to illustrate how to
// copy a map to another map
package main
import "fmt"
func main() {
// Creating and initializing a map
// Using shorthand declaration and
// using map literals
originalMap := make(map[string]int)
originalMap["one"] = 1
originalMap["two"] = 2
originalMap["three"] = 3
originalMap["four"] = 4
originalMap["five"] = 5
originalMap["six"] = 6
originalMap["seven"] = 7
originalMap["eight"] = 8
originalMap["nine"] = 9
// Creating empty map
CopiedMap:= make(map[string]int)
/* Copy Content from Map1 to Map2*/
for index, element := range originalMap{
CopiedMap[index] = element
}
for index, element := range CopiedMap{
fmt.Println(index, "=>", element)
}
}
输出:
seven => 7
eight => 8
two => 2
four => 4
three => 3
six => 6
nine => 9
one => 1
five => 5
例 2:
// Go program to illustrate how to
// copy a map to another map
package main
import "fmt"
func main() {
// Creating and initializing a map
// Using shorthand declaration and
// using map literals
map_1 := map[int]string{
90: "Dog",
91: "Cat",
92: "Cow",
93: "Bird",
94: "Rabbit",
}
// Creating and initializing empty map
map2 := map[string]int{}
/* Copy Content from Map1 to Map2*/
for key, value := range map_1{
map2[value] = key
}
fmt.Println("Copied Map :", map2)
}
输出:
Copied Map : map[Bird:93 Rabbit:94 Dog:90 Cat:91 Cow:92]
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