map + reduce

2 files changed, 25 insertions, 1 deletions

diff --git a/examples/README.md b/examples/README.md
index 33c957d..1d0e0c1 100644
--- a/examples/README.md
+++ b/examples/README.md
@@ -1,6 +1,7 @@
 ## A guided tour of KaiScript through examples
 
-Open this in your IDE of choice--make sure your LSP is running so you can inspect types.
+Open this in your IDE of choice--make sure your LSP is running so you can inspect types. Feel free to run `tsx` on each file to verify the runtime outputs.
+If you're reading this without an LSP, I've added type annotations in comments above each result. I promise these match what you'd see if you hovered over the value!
 
 1. [Breaking the second wall](./mapper.ts)
 
@@ -11,3 +12,5 @@ Open this in your IDE of choice--make sure your LSP is running so you can inspec
 4. [Turing completeness](./branching.ts)
 
 5. [Infinite computation](./recursion.ts)
+
+6. [Infinite transformation](./mapReduce.ts)
diff --git a/examples/mapReduce.ts b/examples/mapReduce.ts
new file mode 100644
index 0000000..3904b2a
--- /dev/null
+++ b/examples/mapReduce.ts
@@ -0,0 +1,21 @@
+/*
+You can do anything with map + reduce!
+*/
+
+import { createFn } from "../src";
+
+const concatNumbers = createFn<[number[]]>()(
+  `fn(a, reduce(map(a, fn(n, tostring(n))), fn(acc, cur, add(acc,cur)), ""))`
+);
+
+// const result: "1235"
+const concatted = concatNumbers([1, 2, 35]);
+console.log(concatted);
+
+const arrayLength = createFn<[any[]]>()(
+  `fn(a, reduce(a, fn(acc, add(acc, 1)), 0))`
+);
+
+// const length: 2
+const length = arrayLength(["hello", "world"]);
+console.log(length);