What data types are suitable for use as keys in a Map data structure?

In Go, only data types that support the comparison operation (==) can be used as keys for a map. This means that keys can be:

• Boolean values (bool)
• All kinds of numbers (int, float64, uint8, etc.)
• Strings (string)
• Pointers
• Channels
• Interfaces, if the concrete values inside them are comparable
• Structs and arrays, if all their fields or elements are comparable

Slices, maps, and functions cannot be used as keys because they do not support comparison.

Example:

m := make(map[string]int)
m["key"] = 42

// Struct with comparable fields
type Point struct {
    X, Y int
}

points := make(map[Point]string)
points[Point{1, 2}] = "A"

If you need to use incomparable types, such as slices, as keys, you typically apply hashing or convert them to a string.