blog: Add 2025-07-28.md

Author: ingydotnet

blog/2025-07-28.md

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+---
+title: YS on jank, bb and ys
+date: 2025-07-28
+draft: false
+authors: [ingydotnet]
+categories: [Summer-of-YS]
+edit: blog/2025-07-28.md
+comments: true
+---
+
+Last [Friday](2025-07-25.md) we got a YS program running on Go using Glojure.
+
+Today we'll show how to run it on 3 other Clojure platforms:
+
+1. [jank](https://github.com/jank-lang/jank) - Clojure hosted by C++ on LLVM
+2. [bb](https://babashka.org) - Clojure using
+   [SCI](https://github.com/babashka/sci) and [GraalVM](https://graalvm.org)
+3. [ys](https://yamlscript.org) - YS can run Clojure from a YS
+   `ys -c` compile command
+
+
+<!-- more -->
+
+
+## jank
+
+jank is a work in progress, but if you can get it to compile, you can run at
+least some YS code through it.
+
+Again, we use `ys -c` to compile the code to Clojure.
+In this example, we write it to a temporary file and then run it with `jank
+run`.
+
+
+```bash
+$ ys -ce '
+defn rng(a b): range(a b:inc)
+defn or?(a b): a:empty?.if(b a)
+say =: println
+
+doseq x (1 .. 16): !:say
+  or?:
+    str:
+      zero?(x % 3).when("Fizz")
+      zero?(x % 5).when("Buzz")
+    =>: x
+' | jank run $(f=$(mktemp);cat>$f;echo $f)
+1
+2
+Fizz
+4
+Buzz
+Fizz
+7
+8
+Fizz
+Buzz
+11
+Fizz
+13
+14
+FizzBuzz
+16
+nil
+```
+
+
+## bb
+
+bb (aka Babashka) is a Clojure interpreter that is GraalVM compiled.
+It is very mature.
+
+```bash
+$ ys -ce '
+defn rng(a b): range(a b:inc)
+defn or?(a b): a:empty?.if(b a)
+say =: println
+
+doseq x (1 .. 16): !:say
+  or?:
+    str:
+      zero?(x % 3).when("Fizz")
+      zero?(x % 5).when("Buzz")
+    =>: x
+' | bb /dev/stdin
+1
+2
+Fizz
+4
+Buzz
+Fizz
+7
+8
+Fizz
+Buzz
+11
+Fizz
+13
+14
+FizzBuzz
+16
+```
+
+
+## ys
+
+The `ys` YS interpreter can run a lot of Clojure code.
+As long as it has access to the Java classes used in the code.
+
+Here we use `ys` twice.
+It's a bit silly.
+But it shows that `ys` can run Clojure code with the `ys -C` flag.
+
+The `-c` flag is used to compile the code to Clojure.
+The `-C` flag is used to **not** compile the code to Clojure.
+(It's already Clojure!)
+
+```bash
+$ ys -ce '
+defn rng(a b): range(a b:inc)
+defn or?(a b): a:empty?.if(b a)
+say =: println
+
+doseq x (1 .. 16): !:say
+  or?:
+    str:
+      zero?(x % 3).when("Fizz")
+      zero?(x % 5).when("Buzz")
+    =>: x
+' | ys -C -
+1
+2
+Fizz
+4
+Buzz
+Fizz
+7
+8
+Fizz
+Buzz
+11
+Fizz
+13
+14
+FizzBuzz
+16
+```
+
+
+## What's Next?
+
+I guess we could have also shown this evaluated by:
+
+* Clojure - For the JVM
+* ClojureScript - For the browser and Node.js
+
+or any of the other emerging Clojure platforms.