Added a maps usage example. (0.37.59)

CMakeLists.txt

@@ -1,5 +1,5 @@
 cmake_minimum_required(VERSION 3.10)
-project(fun VERSION 0.37.58 LANGUAGES C)
+project(fun VERSION 0.37.59 LANGUAGES C)
 
 set(CMAKE_C_STANDARD 99)
 set(CMAKE_C_STANDARD_REQUIRED ON)

examples/maps.fun

@@ -0,0 +1,62 @@
+#!/usr/bin/env fun
+
+/*
+ * This file is part of the Fun programming language.
+ * https://fun-lang.xyz/
+ *
+ * Copyright 2026 Johannes Findeisen <you@hanez.org>
+ * Licensed under the terms of the Apache-2.0 license.
+ * https://opensource.org/license/apache-2-0
+ *
+ * Added: 2026-01-19
+ */
+
+/*
+ * Maps datatype — focused examples
+ *
+ * This script exclusively demonstrates the built-in maps datatype:
+ * - Creating maps with literals and empty maps
+ * - Reading and writing entries via [key]
+ * - Checking for key existence with has(map, key)
+ * - Getting keys(map) and values(map)
+ * - Using nested maps
+ */
+
+// Create an empty map and add entries
+user = {}
+user["name"] = "Ada"
+user["age"] = 37
+print(user)                   // -> {"name": "Ada", "age": 37}
+
+// Read an entry by key
+print(user["name"])          // -> Ada
+
+// Update an existing entry
+user["age"] = 38
+print(user["age"])           // -> 38
+
+// Check if a key exists
+print(has(user, "age"))      // -> 1 (true)
+print(has(user, "email"))    // -> 0 (false)
+
+// Keys and values (order may vary)
+print(keys(user))             // -> [name, age]
+print(values(user))           // -> ["Ada", 38]
+
+// Nested maps
+address = { "city": "London", "zip": "E1" }
+user["address"] = address
+print(user["address"])       // -> {"city": "London", "zip": "E1"}
+print(user["address"]["city"]) // -> London
+
+/* Expected output:
+{"name": Ada, "age": 37}
+Ada
+38
+1
+0
+[name, age]
+[Ada, 38]
+{"zip": E1, "city": London}
+London
+*/