What parameter is used as a unique identifier for elements in data structures of the Map type?

In Go, the keys for elements in a data structure map can be of types that support comparison operations (== and !=). This means the key must be a comparable type, for example:

• basic types: int, string, float64, bool
• pointers
• structs, if all their fields are comparable

Slices, maps, functions, and other non-comparable types cannot be used as keys.

Example:

m := make(map[string]int)
m["key1"] = 100
m["key2"] = 200

fmt.Println(m["key1"]) // 100

Thus, the unique identifier for elements in a map is a key that must be a comparable type.