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interface User {
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  id: number;
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  name: string;
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  email: string;
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}
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async function fetchUser(id: number): Promise<User> {
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  const response = await fetch(`/api/users/${id}`);
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  if (!response.ok) {
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    throw new Error('User not found');
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  }
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  return response.json();
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}
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const user = await fetchUser(1);
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console.log(user.name);

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from dataclasses import dataclass
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from typing import Optional
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import httpx
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@dataclass
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class User:
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    id: int
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    name: str
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    email: str
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async def fetch_user(user_id: int) -> Optional[User]:
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    async with httpx.AsyncClient() as client:
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        response = await client.get(f"/api/users/{user_id}")
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        if response.status_code != 200:
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            return None
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        data = response.json()
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        return User(**data)
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user = await fetch_user(1)
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print(user.name)

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use serde::{Deserialize, Serialize};
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#[derive(Debug, Serialize, Deserialize)]
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struct User {
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    id: u32,
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    name: String,
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    email: String,
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}
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async fn fetch_user(id: u32) -> Result<User, reqwest::Error> {
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    let url = format!("/api/users/{}", id);
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    let user = reqwest::get(&url)
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        .await?
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        .json::<User>()
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        .await?;
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    Ok(user)
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}
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#[tokio::main]
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async fn main() {
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    let user = fetch_user(1).await.unwrap();
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    println!("{}", user.name);
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}

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#include <iostream>
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#include <string>
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#include <optional>
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struct User {
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    int id;
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    std::string name;
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    std::string email;
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};
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std::optional<User> fetch_user(int id) {
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    // Simulated API call
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    if (id <= 0) {
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        return std::nullopt;
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    }
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    return User{id, "John Doe", "john@example.com"};
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}
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int main() {
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    if (auto user = fetch_user(1)) {
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        std::cout << user->name << std::endl;
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    }
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    return 0;
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}