Built-ins: Maps and more... ;)

examples/builtins_maps_and_more.fun

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+#!/usr/bin/env fun
+
+// Maps, map/filter/reduce, labeled break/continue (depth), and file I/O
+
+// Map literal and indexing
+m = { "a": 1, "b": 2 }
+print(m)                         // -> {"a": 1, "b": 2} (order may vary)
+print(m["a"])                    // -> 1
+m["c"] = 5
+print(has(m, "c"))               // -> 1
+print(keys(m))                   // -> ["a", "b", "c"] (order may vary)
+print(values(m))                 // -> [1, 2, 5]       (order may vary)
+
+// map/filter/reduce
+nums = [1, 2, 3, 4]
+
+fun double(x)
+  return x + x
+
+fun is_odd(x)
+  return x % 2 == 1
+
+fun sum2(a, b)
+  return a + b
+
+print(map(nums, double))         // -> [2, 4, 6, 8]
+print(filter(nums, is_odd))      // -> [1, 3]
+print(reduce(nums, 0, sum2))     // -> 10
+
+// labeled break/continue by depth using nested loops
+for i in range(0, 3)
+  for j in range(0, 5)
+    if j == 1
+      continue 1                 // skip to next j
+    if i == 1 && j == 2
+      break 2                    // break outer and inner
+    print(i * 10 + j)
+
+// file I/O (writes then reads)
+path = "tmp_io_example.txt"
+ok = write_file(path, "hello-io")
+print(ok)                        // -> 1
+content = read_file(path)
+print(content)                   // -> hello-io
+
+/* Expected output:
+{"a": 1, "b": 2}
+1
+1
+["a", "b", "c"]
+[1, 2, 5]
+[2, 4, 6, 8]
+[1, 3]
+10
+0
+2
+3
+1
+hello-io
+*/