Pythonic way to create lists based on existing lists. More concise and readable than traditional for loops.

# Basic syntax
squares = [x**2 for x in range(10)]

# With condition
even_squares = [x**2 for x in range(10) if x % 2 == 0]

# Nested comprehension
matrix = [[i*j for j in range(3)] for i in range(3)]

Modern way to handle asynchronous operations. Makes async code look and behave like synchronous code.

// Async function declaration
async function fetchData() {
    try {
        const response = await fetch('/api/data');
        const data = await response.json();
        return data;
    } catch (error) {
        console.error('Error:', error);
    }
}

// Using Promise.all for parallel execution
async function fetchMultiple() {
    const [users, posts] = await Promise.all([
        fetch('/api/users'),
        fetch('/api/posts')
    ]);
    return { users, posts };
}

Key differences between interfaces and abstract classes in Java.

// Interface - contract definition
public interface Drawable {
    void draw(); // implicitly public abstract
    default void print() {
        System.out.println("Printing...");
    }
}

// Abstract class - partial implementation
public abstract class Shape {
    protected String color;
    
    public Shape(String color) {
        this.color = color;
    }
    
    public abstract double getArea();
    
    public String getColor() {
        return color;
    }
}

Decorators are a powerful feature that allows you to modify or enhance functions without changing their source code.

import functools
import time

# Function decorator
def timer(func):
    @functools.wraps(func)
    def wrapper(*args, **kwargs):
        start = time.time()
        result = func(*args, **kwargs)
        elapsed = time.time() - start
        print(f"{func.__name__} took {elapsed:.2f}s")
        return result
    return wrapper

@timer
def slow_function():
    time.sleep(1)
    return "Done"

Language Integrated Query (LINQ) provides a consistent query experience across different data sources.

// Query syntax
var adults = from p in people
             where p.Age >= 18
             orderby p.Name
             select p.Name;

// Method syntax
var adults = people
    .Where(p => p.Age >= 18)
    .OrderBy(p => p.Name)
    .Select(p => p.Name)
    .ToList();

// Aggregation
var avgAge = people.Average(p => p.Age);

Smart pointers manage memory automatically, preventing memory leaks and dangling pointers.

#include 

// Unique pointer - exclusive ownership
std::unique_ptr ptr1 = std::make_unique(42);
auto ptr2 = std::make_unique>(10);

// Shared pointer - shared ownership
std::shared_ptr res1 = std::make_shared();
std::shared_ptr res2 = res1; // reference count: 2

// Weak pointer - non-owning reference
std::weak_ptr weak = res1;