Everything Lingua does. Honestly.

// runs in a sandboxed worker, capped output, instant feedback
const reqs = ['/api/health', '/api/version', '/api/build'];
const probes = await Promise.all(
  reqs.map((u) => fetch(u).then((r) => [u, r.status]))
);
console.table(Object.fromEntries(probes));

// type-check happens in your editor; runtime is the JS worker
type Tier = 'free' | 'pro' | 'pro_lifetime' | 'team';
const limits: Record<Tier, number | 'unlimited'> = {
  free: 5, pro: 'unlimited', pro_lifetime: 'unlimited', team: 'unlimited',
};
console.log(limits.free); //=> 5

# zero install — Pyodide ships inside the binary
import statistics
samples = [42, 51, 39, 47, 55, 38, 49, 44, 52, 46]
print({
    'mean': round(statistics.mean(samples), 2),
    'stdev': round(statistics.stdev(samples), 2),
})

# bundled WASM runs everywhere; desktop can use system Ruby
events = [
  { name: 'build', duration_ms: 184 },
  { name: 'test', duration_ms: 92 },
]
puts events.sort_by { |event| event[:duration_ms] }.map { |event|
  "#{event[:name]}: #{event[:duration_ms]}ms"
}

package main

import "fmt"

func main() {
    langs := []string{"js", "ts", "python", "ruby", "go", "rust"}
    fmt.Printf("lingua runs %d languages\n", len(langs))
}

fn main() {
    let langs = ["js", "ts", "python", "ruby", "go", "rust"];
    let total: usize = langs.iter().map(|l| l.len()).sum();
    println!("{} chars across {} langs", total, langs.len());
}