Claude Cheat Sheet

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Überblick

Claude ist Anthropics KI-Assistent für hilfsbereit, harmlos und ehrlich. Es zeichnet sich durch Codegenerierung, Analyse, Debugging und technisches Schreiben aus. Claude unterstützt mehrere Programmiersprachen und kann mit komplexen Software-Entwicklungsaufgaben, architektonischen Entscheidungen und Code-Rezensionen helfen.

ZEIT Anmerkung: Erfordert Anthropisches Konto. Free tier verfügbar mit Nutzungslimits. Professionelle und Teampläne bieten höhere Limits und zusätzliche Features.

Zugriffsmethoden

Web Interface

```bash

Direct browser access

Visit: https://claude.ai

Sign up with email or Google account

Start chatting immediately

```_

API Integration

```bash

Install Anthropic SDK

pip install anthropic

Or using npm

npm install @anthropic-ai/sdk

Set API key

export ANTHROPIC_API_KEY=your_api_key_here ```_

Integrationen Dritter

```bash

Popular IDE extensions:

- Claude for VS Code (community)

- Claude Dev (VS Code extension)

- Cline (formerly Claude Dev)

Install Cline extension

code --install-extension saoudrizwan.claude-dev ```_

API Verwendung

Python SDK

```python import anthropic

Initialize client

client = anthropic.Anthropic( api_key="your_api_key_here" )

Basic message

message = client.messages.create( model="claude-3-5-sonnet-20241022", max_tokens=1000, temperature=0, messages=[ { "role": "user", "content": "Write a Python function to calculate fibonacci numbers" } ] )

print(message.content) ```_

Node.js SDK

```javascript import Anthropic from '@anthropic-ai/sdk';

const anthropic = new Anthropic({ apiKey: process.env.ANTHROPIC_API_KEY, });

const msg = await anthropic.messages.create({ model: "claude-3-5-sonnet-20241022", max_tokens: 1000, temperature: 0, messages: [ { "role": "user", "content": "Create a React component for a todo list" } ] });

console.log(msg.content); ```_

CURL Beispiele

```bash

Basic API call

curl https://api.anthropic.com/v1/messages \ --header "x-api-key: $ANTHROPIC_API_KEY" \ --header "content-type: application/json" \ --header "anthropic-version: 2023-06-01" \ --data '{ "model": "claude-3-5-sonnet-20241022", "max_tokens": 1000, "messages": [ { "role": "user", "content": "Explain async/await in JavaScript" } ] }' ```_

Modellversionen

Claude 3.5 Sonnet

```bash

Model: claude-3-5-sonnet-20241022

Best overall performance

Excellent for coding tasks

Strong reasoning capabilities

200K context window

```_

Claude 3 Opus

```bash

Model: claude-3-opus-20240229

Most capable model

Best for complex reasoning

Highest accuracy

200K context window

Higher cost per token

```_

Claude 3 Haiku

```bash

Model: claude-3-haiku-20240307

Fastest and most affordable

Good for simple tasks

Quick responses

200K context window

Lower cost per token

```_

Code Generation

Funktion Erstellung

```python

Prompt: "Create a Python function to validate email addresses with regex"

import re

def validate_email(email): """ Validate email address using regex pattern.

Args:
    email (str): Email address to validate

Returns:
    bool: True if valid email, False otherwise
"""
pattern = r'^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}$'
return re.match(pattern, email) is not None

Example usage

print(validate_email("user@example.com")) # True print(validate_email("invalid-email")) # False ```_

Einführung

```javascript // Prompt: "Create a JavaScript class for managing a shopping cart" class ShoppingCart { constructor() { this.items = []; this.total = 0; }

addItem(product, quantity = 1) {
    const existingItem = this.items.find(item => item.product.id === product.id);

    if (existingItem) {
        existingItem.quantity += quantity;
    } else {
        this.items.push({ product, quantity });
    }

    this.updateTotal();
}

removeItem(productId) {
    this.items = this.items.filter(item => item.product.id !== productId);
    this.updateTotal();
}

updateTotal() {
    this.total = this.items.reduce((sum, item) => {
        return sum + (item.product.price * item.quantity);
    }, 0);
}

getItemCount() {
    return this.items.reduce((count, item) => count + item.quantity, 0);
}

} ```_

API Endpoint Entwicklung

```python

Prompt: "Create a FastAPI endpoint for user authentication"

from fastapi import FastAPI, HTTPException, Depends from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials from pydantic import BaseModel import jwt import bcrypt from datetime import datetime, timedelta

app = FastAPI() security = HTTPBearer()

class UserLogin(BaseModel): username: str password: str

class UserResponse(BaseModel): username: str token: str

@app.post("/auth/login", response_model=UserResponse) async def login(user_data: UserLogin): # Verify user credentials (implement your user verification logic) if not verify_user(user_data.username, user_data.password): raise HTTPException(status_code=401, detail="Invalid credentials")

# Generate JWT token
token_data = {
    "username": user_data.username,
    "exp": datetime.utcnow() + timedelta(hours=24)
}
token = jwt.encode(token_data, "your-secret-key", algorithm="HS256")

return UserResponse(username=user_data.username, token=token)

def verify_user(username: str, password: str) -> bool: # Implement your user verification logic here # This is a placeholder implementation return True ```_

Analyse und Bewertung

Code Erläuterung

```bash

Prompt: "Explain this code and suggest improvements"

Claude analyzes code structure, logic, and provides detailed explanations

Identifies potential issues and optimization opportunities

Suggests best practices and alternative approaches

```_

Sicherheitsüberprüfung

```python

Prompt: "Review this code for security vulnerabilities"

Claude identifies:

- SQL injection risks

- XSS vulnerabilities

- Authentication issues

- Input validation problems

- Cryptographic weaknesses

- Access control flaws

```_

Leistungsanalyse

```bash

Prompt: "Analyze this code for performance bottlenecks"

Claude examines:

- Algorithm complexity

- Memory usage patterns

- Database query efficiency

- Caching opportunities

- Concurrent processing potential

```_

Debugging Assistance

Fehlerdiagnose

```python

Share error message and code context

Claude provides:

- Root cause analysis

- Step-by-step debugging approach

- Multiple solution options

- Prevention strategies

Example prompt:

""" I'm getting this error: "TypeError: 'NoneType' object is not subscriptable" Here's my code: [paste your code here] Can you help me debug this? """ ```_

Teststrategie

```javascript // Prompt: "Create comprehensive tests for this function" // Claude generates: // - Unit tests // - Integration tests // - Edge case scenarios // - Mock implementations // - Test data fixtures

describe('ShoppingCart', () => { let cart;

beforeEach(() => {
    cart = new ShoppingCart();
});

test('should initialize with empty items and zero total', () => {
    expect(cart.items).toEqual([]);
    expect(cart.total).toBe(0);
});

test('should add new item to cart', () => {
    const product = { id: 1, name: 'Test Product', price: 10.99 };
    cart.addItem(product, 2);

    expect(cart.items).toHaveLength(1);
    expect(cart.items[0].quantity).toBe(2);
    expect(cart.total).toBe(21.98);
});

}); ```_

Erweiterte Funktionen

Multiturn Conversations

```python

Maintain context across multiple interactions

Claude remembers previous code discussions

Can iterate on solutions

Builds upon previous suggestions

Example conversation flow:

1. "Create a user management system"

2. "Add password hashing to the previous code"

3. "Now add email verification functionality"

4. "Include rate limiting for login attempts"

```_

Code Refactoring

```bash

Prompt: "Refactor this code to use modern Python patterns"

Claude transforms:

- Legacy code to modern syntax

- Procedural to object-oriented

- Synchronous to asynchronous

- Monolithic to modular design

```_

Architektur Design

```bash

Prompt: "Design a microservices architecture for an e-commerce platform"

Claude provides:

- Service decomposition strategy

- API design patterns

- Database architecture

- Communication protocols

- Deployment considerations

```_

IDE Integration

VS Code mit Cline

```bash

Install Cline extension

code --install-extension saoudrizwan.claude-dev

Features:

- Inline code generation

- File editing capabilities

- Terminal command execution

- Multi-file project understanding

- Automated testing

```_

Konfiguration

json // VS Code settings for Claude integration { "claude-dev.apiKey": "your_api_key", "claude-dev.model": "claude-3-5-sonnet-20241022", "claude-dev.maxTokens": 4000, "claude-dev.temperature": 0.1 }_

Keyboard Shortcuts

```bash

Common shortcuts in Claude-enabled editors:

Ctrl+Shift+P # Open command palette Ctrl+K Ctrl+I # Inline code generation Ctrl+K Ctrl+C # Code explanation Ctrl+K Ctrl+T # Generate tests Ctrl+K Ctrl+R # Refactor code ```_

Best Practices

Effektive Vermutung

```bash

Be specific and provide context

Good: "Create a Python function that validates email addresses using regex, handles edge cases, and returns detailed error messages"

Bad: "Make email validator"

Include relevant details:

- Programming language

- Framework/library preferences

- Performance requirements

- Error handling needs

- Testing requirements

```_

Code Qualität

```bash

Always review generated code:

1. Test functionality thoroughly

2. Check for security vulnerabilities

3. Verify error handling

4. Ensure code style consistency

5. Validate performance implications

```_

Entwicklung

```bash

Use Claude for iterative improvement:

1. Start with basic implementation

2. Add error handling

3. Improve performance

4. Add comprehensive tests

5. Refactor for maintainability

```_

Preise und Grenzen

Free Tier

```bash

Claude.ai web interface:

- Limited messages per day

- Access to Claude 3.5 Sonnet

- Basic conversation features

- No API access

```_

Pro Plan ($20/Monat)

```bash

Enhanced features:

- 5x more usage

- Priority bandwidth

- Early access to new features

- Create Projects with Claude

```_

API Pricing

```bash

Claude 3.5 Sonnet:

Input: $3 per million tokens

Output: $15 per million tokens

Claude 3 Opus:

Input: $15 per million tokens

Output: $75 per million tokens

Claude 3 Haiku:

Input: $0.25 per million tokens

Output: $1.25 per million tokens

```_

Fehlerbehebung

Gemeinsame Themen

```bash

API rate limits:

- Implement exponential backoff

- Monitor usage quotas

- Use appropriate model for task

Context window limits:

- Break large requests into chunks

- Summarize previous context

- Use conversation memory efficiently

```_

Fehlerbehebung

```python

Robust API error handling

import anthropic from anthropic import APIError, RateLimitError

try: response = client.messages.create( model="claude-3-5-sonnet-20241022", max_tokens=1000, messages=[{"role": "user", "content": prompt}] ) except RateLimitError: print("Rate limit exceeded. Please wait and try again.") except APIError as e: print(f"API error occurred: {e}") except Exception as e: print(f"Unexpected error: {e}") ```_

Leistungsoptimierung

```bash

Optimize API usage:

- Use appropriate model for task complexity

- Set reasonable max_tokens limits

- Implement caching for repeated queries

- Batch similar requests when possible

```_

Ressourcen

Dokumentation

• Anthropische API Dokumentation
• [Claude Model Information](URL_1
• [API Reference](LINK_11_

Gemeinschaft

• Anthropischer Discord
• [Reddit r/ClaudeAI](LINK_13__
• Stack Overflow

Werkzeuge und Erweiterungen

• [Cline VS Code Extension](URL_6
• [Claude API Cookbook](LINK_16_
• [Gemeinschaftswerkzeuge](URL_8