How does the value in the Golang Map interface change?

How do the values ​​in the Golang Map interface change? This is a question that confuses many Golang developers. In Go language, map is a very important data structure, which stores data in the form of key-value pairs. However, when using map, we need to pay attention to some details, especially when dealing with value changes. So, let's take a closer look at how values ​​change in Golang's Map interface.

Question content

This is the code base - https://go.dev/play/p/bedouz9qhag

Output -

map[something:map[acm:34.12 age:12 dune:dune]]

What effect does changing the value of the t variable have on x?

package main

import "fmt"

    func main() {
        x: = make(map[string] interface {}, 10)
        x["something"] = map[string] interface {} {
            "dune": "dune", "age": 12
        }
    
        t: = x["something"].(map[string] interface {})
        t["ACM"] = 34.12
       

 fmt.Println(x)
}

Solution

The mapped type is a reference type, such as a pointer or slice,

So this line

t := x["something"].(map[string]interface{}) t["ACM"] = 34.12 fmt.Println(x) }

Just create a shallow copy of the existing map x you created in the alias variable, so they point to the same memory address where the original map you created is.

See reference -https://www.php.cn/link/0bf31d0d702fcac8c8e07912f3347c31

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