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import axios from "axios";
import express from "express";
const PORT = 3000;
const app = express();
const {get} = axios.create({baseURL: `http://localhost:${PORT}`});
const getFib = (n) => get("/fib", {params: {n}}).then(({data}) => data);
app.get("/fib", async (req, res, next) => {
const n = Number(req.query.n);
if (!isFinite(n) || n < 0) {
res.status(400).json("`n` must be a natural number");
} else if (n <= 1) {
res.status(200).json(n);
} else {
const [nSub1, nSub2] = await Promise.all([getFib(n - 1), getFib(n - 2)]);
res.status(200).json(nSub1 + nSub2);
}
return next();
});
app.listen(PORT);
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