Explain maps in Go.

Maps in Go: • Key-value data structure (hash table) • Reference type, zero value is nil • Keys must be comparable types • Dynamic size • Not thread-safe Example: // Declaration var m map[string]int m = make(map[string]int) // Literal m := map[string]int{ "apple": 5, "banana": 3, } // Operations m["orange"] = 7 value, ok := m["apple"] delete(m, "banana")