For developers who know the foundations but feel stuck.

function checkout(cart) {
  let total = 0;
  for (let i = 0; i < cart.items.length; i++) {
    total += cart.items[i].price * cart.items[i].qty;
  }
  if (total > 100) {
    total = total * 0.9;
  }
  let tax = total * 0.2;
  return total + tax;
}

interface CartItem { price: number; quantity: number; }

export class CheckoutService {
  private readonly TAX_RATE = 0.2;
  private readonly DISCOUNT_THRESHOLD = 100;

  public calculateTotal(items: CartItem[]): number {
    const subtotal = this.sumItems(items);
    const discounted = this.applyDiscounts(subtotal);
    return discounted + this.calculateTax(discounted);
  }

  private sumItems = (items: CartItem[]) => 
    items.reduce((acc, item) => acc + (item.price * item.quantity), 0);

  private applyDiscounts = (amount: number) => 
    amount > this.DISCOUNT_THRESHOLD ? amount * 0.9 : amount;

  private calculateTax = (amount: number) => amount * this.TAX_RATE;
}

def import_users(filename):
    with open(filename, 'r') as f:
        for line in f:
            row = line.split(',')
            user = {
                'name': row[0],
                'email': row[1],
                'age': int(row[2])
            }
            db.save(user)

@dataclass(frozen=True)
class UserSchema:
    full_name: str
    email: str
    age: int

def parse_user_row(row: list[str]) -> UserSchema:
    if len(row) < 3:
        raise ValueError("Invalid row format")
    
    return UserSchema(
        full_name=row[0].strip(),
        email=normalize_email(row[1]),
        age=safe_int(row[2])
    )

def process_import(rows: list[list[str]]):
    valid_users = [
        parse_user_row(r) for r in rows 
        if is_valid_row(r)
    ]
    repository.bulk_save(valid_users)

<div style="background:#112a3a;padding:20px;border-radius:8px">
  <h3 style="color:#fff;margin:0">Is this for you?</h3>
  <p style="color:#94a3b8">Check your eligibility.</p>
  <button id="btn" onclick="check()" style="background:#38bdf8;border:none;padding:10px">Start</button>
</div>
<script>
function check() {
  document.getElementById('btn').innerText = 'Loading...';
}
</script>

<article x-data="{ loading: false }" class="p-8 bg-brand-surface border border-brand-border rounded-brand">
  <h3 class="text-xl font-bold text-brand-heading">Programme Fit Check</h3>
  <p class="mt-2 text-brand-body">Find out if the 6-week 1-to-1 is right for your career stage.</p>
  
  <button 
    @click="loading = true"
    :disabled="loading"
    class="mt-6 w-full py-3 bg-brand-primary text-brand-background font-mono font-bold uppercase tracking-wider transition-all disabled:opacity-50"
  >
    <span x-show="!loading">Take the Assessment</span>
    <span x-show="loading">Loading ...</span>
  </button>
</article>

version: '3'
services:
  api:
    image: my-api:latest
    ports:
      - "8080:8080"
    environment:
      - DB_PASSWORD=mysecretpassword

apiVersion: apps/v1
kind: Deployment
metadata:
  name: api-server
spec:
  template:
    spec:
      containers:
      - name: api
        image: my-api:v1.2.4
        envFrom:
        - secretRef:
            name: db-credentials
        resources:
          limits:
            cpu: "500m"
            memory: "512Mi"
        livenessProbe:
          httpGet:
            path: /healthz
            port: 8080