When to use class vs function in Python?
As a beginner, I'm confused about when I should use a class vs just functions. What are the guidelines?...
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Debounce vs Throttle - What's the difference?
I keep seeing debounce and throttle functions in JavaScript libraries. What's the difference between them? When should I use debounce vs throttle? Can someone provide simple implementations of both w...
Understanding Python decorators
I see @decorator syntax in Python code but I don't understand how decorators work. Can someone explain with examples?...
What is Object-Oriented Programming?
I keep hearing about OOP but I don't understand encapsulation, inheritance, and polymorphism. Can someone explain?...
How does garbage collection work?
How does garbage collection work in languages like Java and Python? How does it know when to free memory?...
SQL JOIN types explained with examples
I always mix up the different types of SQL JOINs. Can someone explain with clear examples: - INNER JOIN - LEFT JOIN - RIGHT JOIN - FULL OUTER JOIN - CROSS JOIN What's the difference and when would I...
Understanding Promise.all vs Promise.allSettled
I'm confused about when to use Promise.all() vs Promise.allSettled() in JavaScript. From what I understand: - Promise.all() fails fast if any promise rejects - Promise.allSettled() waits for all prom...
What is *args and **kwargs in Python?
I see *args and **kwargs in Python function definitions but I don't understand what they mean. ```python def my_function(*args, **kwargs): pass ``` Can someone explain with examples?...
Multithreading vs Multiprocessing
What's the difference between multithreading and multiprocessing? When should I use each?...
Understanding pointers in C
Pointers in C are confusing me. What exactly is a pointer and why do we need them?...
How to reverse a string in JavaScript?
I need to reverse a string in JavaScript. For example, "hello" should become "olleh". I've tried using a for loop but my code isn't working: ```javascript function reverseString(str) { let reverse...
Python list comprehension vs map/filter
When should I use list comprehension vs map() and filter() in Python? For example, these seem to do the same thing: ```python # List comprehension squares = [x**2 for x in range(10)] # map squares ...
Understanding recursion with examples
I'm struggling to understand recursion. Can someone explain it with simple examples like factorial?...
How to optimize slow SQL queries?
My SQL query is running very slow on a large table (millions of rows). The query: ```sql SELECT * FROM orders WHERE customer_id = 12345 AND created_at > '2024-01-01' ORDER BY created_at DESC; ``` ...
What's the difference between == and === in JavaScript?
I've seen both == and === used in JavaScript. What's the difference and when should I use each one?...
Understanding Docker basics
What is Docker and why is it useful? How is it different from virtual machines?...
Understanding async/await in Python
How does async/await work in Python? When should I use it instead of regular synchronous code?...
Difference between let, const, and var in JavaScript
When should I use let vs const vs var in JavaScript? I've heard var is outdated?...
Deep copy vs Shallow copy in JavaScript
I need to copy an object in JavaScript, but changes to the copy affect the original object. What's happening? ```javascript const original = { name: 'John', address: { city: 'NYC' } }; const copy = {...
Understanding Python generators and yield
I'm confused about Python generators. What's the difference between: ```python def get_numbers(): return [1, 2, 3, 4, 5] def get_numbers_gen(): yield 1 yield 2 yield 3 yield 4 ...