How to check if a map contains a specific key in Go?

Hello everyone! I just started learning Go, and I have a problem with checking if a key exists in a map. In Python, I'm used to just writing `if key in dict:`, but Go doesn't have such a construct. Let's say I have a map of users: ```go users := map[int]string{ 1: "Alice", 2: "Bob", 3: "Charlie", } ``` I need to check if a user with ID = 4 exists. I tried this code: ```go if users[4] != "" { fmt.Println("User found!") } ``` But this doesn't work if the key's value is an empty string. For example, if I add `4: ""`, my code can't distinguish between a missing key and an empty value. The same goes for numeric maps: if the value is 0, the check will also break. I know that in Go, accessing a non-existent key returns the zero value of the type. But