sdk/js: cleanup example a bit

ts/main.js

@@ -3,27 +3,28 @@ import {Flatend} from "./flatend.js";
 import {ID} from "./packet.js";
 import ip from "ip";
 
+const getTodos = data => {
+    data = JSON.parse(data);
+
+    const id = parseInt(data?.params?.id);
+    if (id !== 123) {
+        throw new Error(`ID must be 123. Got ${id} instead.`);
+    }
+
+    return data;
+}
 
 async function main() {
     const keys = nacl.sign.keyPair();
     const id = new ID({publicKey: keys.publicKey, host: "127.0.0.1", port: 12000});
 
     const backend = new Flatend({id, keys});
 
-    backend.register("get_todos", data => {
-        data = JSON.parse(data);
-
-        if (parseInt(data?.params?.id) !== 123)
-            throw new Error(`ID must be 123. Got ${data?.params?.id}.`);
-
-        return data;
-    });
-
     backend.register("all_todos", () => "hello world!");
+    backend.register("get_todos", getTodos);
 
     await backend.start({port: 9000, host: "127.0.0.1"});
 
-
     console.log(`Successfully connected to ${ip.toString(backend.id.host, 12, 4)}:${backend.id.port}.`);
 }