Real Solutions for Real Problems

def get_user(username):
    # Validate input
    if not username or len(username) > 255:
        raise ValueError("Invalid username")
    
    # Use parameterized query
    query = "SELECT * FROM users WHERE username = ?"
    return db.execute(query, (username,))

class DataProcessor {
  constructor() {
    this.cache = [];
    this.maxCacheSize = 100;
    
    this.interval = setInterval(() => {
      this.cache.push(new Date());
      if (this.cache.length > this.maxCacheSize) {
        this.cache.shift(); // Remove oldest
      }
    }, 1000);
  }
  
  destroy() {
    clearInterval(this.interval);
    this.cache = [];
  }
}

import os
from dotenv import load_dotenv

load_dotenv()

API_KEY = os.getenv("API_KEY")
DATABASE_PASSWORD = os.getenv("DATABASE_PASSWORD")

if not API_KEY or not DATABASE_PASSWORD:
    raise ValueError("Missing required environment variables")

def connect_to_api():
    return requests.get(
        "https://api.example.com",
        headers={"Authorization": f"Bearer {API_KEY}"}
    )

let counter = 0;
const lock = new AsyncLock();

async function incrementCounter() {
  await lock.acquire('counter', async () => {
    const current = counter;
    await someAsyncOperation();
    counter = current + 1;
  });
}