While Loop Java: Syntax, Do-While, and Infinite Loop Survival Guide
While loops are simple until someone forgets the increment and the JVM goes brrrr. Here's while, do-while, break, continue, and common patterns.
HashSet Java: No Duplicates, O(1) Lookups, and the equals() Trap
HashSet silently drops duplicates — which is great until your custom objects break the hashCode/equals contract. Here's how to use it right.
Constructor Java: Default, Parameterized, Chaining, and More
Constructors in Java seem basic until you're debugging a missing super() call at midnight. Here's everything from defaults to the builder pattern.
printf in Java: Format Specifiers, Patterns, and Real Examples
System.out.printf() is powerful once you memorize the format specifiers. Here's %d, %s, %f, width, precision, and when to use String.format() instead.
Java int to String: 5 Ways to Convert (And Which One to Pick)
There are at least 5 ways to convert int to String in Java. Here's each one, when they make sense, and the one-liner hack everyone uses but shouldn't.
For Each Loop Java: The Clean Way to Iterate (With Gotchas)
The enhanced for loop is cleaner than indexed loops — until you need the index or try to modify the collection. Here's when it shines and when it bites.
Java Switch: From Old-School Cases to Modern Switch Expressions
Java switch got a massive upgrade. Here's the classic syntax, the new arrow syntax, pattern matching, and why forgetting break still haunts developers.
Try Catch Java: Exception Handling Without the Antipatterns
Try-catch in Java isn't hard to write — it's hard to write well. Here's the right way to handle exceptions, plus the patterns that'll make reviewers cry.
String to int in Java: parseInt, valueOf, and Surviving NumberFormatException
Converting String to int in Java should be simple. It mostly is — until NumberFormatException ruins your day. Here's every approach and how to handle errors.
Java Queue: LinkedList, PriorityQueue, and Real-World Patterns
Queues are everywhere — message systems, thread pools, BFS. Here's how Java's Queue interface works with practical code you can actually use.
Java Stack: Push, Pop, Peek (And Why You Should Use ArrayDeque)
The Stack class is legacy but it still shows up in interviews. Here's how it works, why ArrayDeque is better, and when you'd actually need a stack.
Math.random() in Java: From Dice Rolls to Secure Tokens
Math.random() gets the job done until it doesn't. Here's when to use it, when to upgrade to ThreadLocalRandom, and when you absolutely need SecureRandom.
Kotlin vs Java: The Real Differences That Matter in 2025
Kotlin vs Java — not the marketing pitch, but the actual day-to-day differences. Data classes, null safety, coroutines, and when Java still wins.
Java Substring: How to Slice Strings Without Getting Burned
Java substring() is simple until it's not. Here's how beginIndex and endIndex actually work, plus every edge case that'll trip you up.
Java List: ArrayList, LinkedList, and Everything You Need to Know
Java List broken down — ArrayList for almost everything, LinkedList for the rare cases, and all the operations you'll use in production code.
Java Map Explained: HashMap, TreeMap, and When to Use Each
Everything you need to know about Java Map — HashMap for speed, TreeMap for order, and all the methods you'll actually use day to day.
Java Interview Questions That Actually Come Up (With Code Examples)
The Java interview questions that actually get asked, with code you can run. From == vs .equals() to HashMap internals — no fluff, just real prep.
Javascript Startswith — A Developer's Guide
A practical guide to javascript startswith with real code examples and tips from the trenches.
Try Catch Javascript — A Developer's Guide
A practical guide to try catch javascript with real code examples and tips from the trenches.
Javascript If Else — A Developer's Guide
A practical guide to javascript if else with real code examples and tips from the trenches.
Javascript If Statement — A Developer's Guide
A practical guide to javascript if statement with real code examples and tips from the trenches.
Javascript Multiline String — A Developer's Guide
A practical guide to javascript multiline string with real code examples and tips from the trenches.
Javascript += — A Developer's Guide
A practical guide to javascript += with real code examples and tips from the trenches.
Switch Javascript — A Developer's Guide
A practical guide to switch javascript with real code examples and tips from the trenches.
Javascript Switch Case — A Developer's Guide
A practical guide to javascript switch case with real code examples and tips from the trenches.
Javascript Absolute Value — A Developer's Guide
A practical guide to javascript absolute value with real code examples and tips from the trenches.
Onclick Javascript — A Developer's Guide
A practical guide to onclick javascript with real code examples and tips from the trenches.
Typeof Javascript — A Developer's Guide
A practical guide to typeof javascript with real code examples and tips from the trenches.
Javascript Else If — A Developer's Guide
A practical guide to javascript else if with real code examples and tips from the trenches.
Javascript Let Vs Var — A Developer's Guide
A practical guide to javascript let vs var with real code examples and tips from the trenches.
Javascript Loop Through Array — A Developer's Guide
A practical guide to javascript loop through array with real code examples and tips from the trenches.
Switch Statement Javascript — A Developer's Guide
A practical guide to switch statement javascript with real code examples and tips from the trenches.
Math.Random Javascript — A Developer's Guide
A practical guide to math.random javascript with real code examples and tips from the trenches.
Spread Operator Javascript — A Developer's Guide
A practical guide to spread operator javascript with real code examples and tips from the trenches.
Javascript Random Number — A Developer's Guide
A practical guide to javascript random number with real code examples and tips from the trenches.
Javascript Split String — A Developer's Guide
A practical guide to javascript split string with real code examples and tips from the trenches.
Javascript String Replace — A Developer's Guide
A practical guide to javascript string replace with real code examples and tips from the trenches.
Splice Javascript — A Developer's Guide
A practical guide to splice javascript with real code examples and tips from the trenches.
Javascript String Length — A Developer's Guide
A practical guide to javascript string length with real code examples and tips from the trenches.
Javascript Switch Statement — A Developer's Guide
A practical guide to javascript switch statement with real code examples and tips from the trenches.
Javascript Includes — A Developer's Guide
A practical guide to javascript includes with real code examples and tips from the trenches.
Filter Javascript — A Developer's Guide
A practical guide to filter javascript with real code examples and tips from the trenches.
Javascript Dictionary — A Developer's Guide
A practical guide to javascript dictionary with real code examples and tips from the trenches.
Javascript Check If Key Exists — A Developer's Guide
A practical guide to javascript check if key exists with real code examples and tips from the trenches.
Javascript Sort — A Developer's Guide
A practical guide to javascript sort with real code examples and tips from the trenches.
Javascript Splice — A Developer's Guide
A practical guide to javascript splice with real code examples and tips from the trenches.
Ternary Operator Javascript — A Developer's Guide
A practical guide to ternary operator javascript with real code examples and tips from the trenches.
Settimeout Javascript — A Developer's Guide
A practical guide to settimeout javascript with real code examples and tips from the trenches.
Javascript Reduce — A Developer's Guide
A practical guide to javascript reduce with real code examples and tips from the trenches.
Javascript Filter — A Developer's Guide
A practical guide to javascript filter with real code examples and tips from the trenches.
Node.Js Vs Javascript — A Developer's Guide
A practical guide to node.js vs javascript with real code examples and tips from the trenches.
Typescript Vs Javascript Differences — A Developer's Guide
A practical guide to typescript vs javascript differences with real code examples and tips from the trenches.
Typescript To Javascript — A Developer's Guide
A practical guide to typescript to javascript with real code examples and tips from the trenches.
React Vs Javascript — A Developer's Guide
A practical guide to react vs javascript with real code examples and tips from the trenches.
Ruby On Rails Vs Javascript — A Developer's Guide
A practical guide to ruby on rails vs javascript with real code examples and tips from the trenches.
Php Vs Javascript — A Developer's Guide
A practical guide to php vs javascript with real code examples and tips from the trenches.
Python Vs Javascript — A Developer's Guide
A practical guide to python vs javascript with real code examples and tips from the trenches.
Javascript Vs Python — A Developer's Guide
A practical guide to javascript vs python with real code examples and tips from the trenches.
Javascript Vs Typescript — A Developer's Guide
A practical guide to javascript vs typescript with real code examples and tips from the trenches.
Difference Between Java And Javascript — A Developer's Guide
A practical guide to difference between java and javascript with real code examples and tips from the trenches.
Javascript Vs Java — A Developer's Guide
A practical guide to javascript vs java with real code examples and tips from the trenches.
Typescript Vs Javascript — A Developer's Guide
A practical guide to typescript vs javascript with real code examples and tips from the trenches.
Python Any — A Developer's Guide
A practical guide to python any with real code examples and tips from the trenches.
Python Null — A Developer's Guide
A practical guide to python null with real code examples and tips from the trenches.
Update Python — A Developer's Guide
A practical guide to update python with real code examples and tips from the trenches.
Python Continue — A Developer's Guide
A practical guide to python continue with real code examples and tips from the trenches.
Python Square Root — A Developer's Guide
A practical guide to python square root with real code examples and tips from the trenches.
Tqdm Python — A Developer's Guide
A practical guide to tqdm python with real code examples and tips from the trenches.
Python Absolute Value — A Developer's Guide
A practical guide to python absolute value with real code examples and tips from the trenches.
Python Modulo — A Developer's Guide
A practical guide to python modulo with real code examples and tips from the trenches.
Python Not Equal — A Developer's Guide
A practical guide to python not equal with real code examples and tips from the trenches.
Python Random Number — A Developer's Guide
A practical guide to python random number with real code examples and tips from the trenches.
+= Python — A Developer's Guide
A practical guide to += python with real code examples and tips from the trenches.
Python Switch Statement — A Developer's Guide
A practical guide to python switch statement with real code examples and tips from the trenches.
Python Reverse List — A Developer's Guide
A practical guide to python reverse list with real code examples and tips from the trenches.
Python Multiprocessing — A Developer's Guide
A practical guide to python multiprocessing with real code examples and tips from the trenches.
Python Read File — A Developer's Guide
A practical guide to python read file with real code examples and tips from the trenches.
Append Python — A Developer's Guide
A practical guide to append python with real code examples and tips from the trenches.
Deque Python — A Developer's Guide
A practical guide to deque python with real code examples and tips from the trenches.
Python += — A Developer's Guide
A practical guide to python += with real code examples and tips from the trenches.
Python Async — A Developer's Guide
A practical guide to python async with real code examples and tips from the trenches.
Set Python — A Developer's Guide
A practical guide to set python with real code examples and tips from the trenches.
Python Yield — A Developer's Guide
A practical guide to python yield with real code examples and tips from the trenches.
Python Join — A Developer's Guide
A practical guide to python join with real code examples and tips from the trenches.
Python Check If File Exists — A Developer's Guide
A practical guide to python check if file exists with real code examples and tips from the trenches.
Python Filter — A Developer's Guide
A practical guide to python filter with real code examples and tips from the trenches.
Python Switch — A Developer's Guide
A practical guide to python switch with real code examples and tips from the trenches.
Python Defaultdict — A Developer's Guide
A practical guide to python defaultdict with real code examples and tips from the trenches.
Python Deque — A Developer's Guide
A practical guide to python deque with real code examples and tips from the trenches.
Python Replace — A Developer's Guide
A practical guide to python replace with real code examples and tips from the trenches.
Python Counter — A Developer's Guide
A practical guide to python counter with real code examples and tips from the trenches.
Python Cheat Sheet — A Developer's Guide
A practical guide to python cheat sheet with real code examples and tips from the trenches.
Python Subprocess — A Developer's Guide
A practical guide to python subprocess with real code examples and tips from the trenches.
Python String Replace — A Developer's Guide
A practical guide to python string replace with real code examples and tips from the trenches.
Python Queue — A Developer's Guide
A practical guide to python queue with real code examples and tips from the trenches.
Python elif — How to Chain Conditions Without Losing Your Mind
The elif keyword is Python's way of saying 'okay but what about THIS condition?' Here's how if/elif/else chains actually work, with real examples and mistakes to avoid.
Python Write to File: Modes, Methods & Real Examples
Learn how to write files in Python with open(), write modes (w/a/x), context managers, CSV, JSON, encoding, and proper error handling.
Python Dotenv: How to Manage Environment Variables Like a Pro
Learn how to use python-dotenv to keep your API keys, database credentials, and secrets out of your source code with .env files.
Python Interview Questions — The 10 That Actually Come Up
Forget the textbook stuff nobody asks. These are the Python interview questions that actually show up — with code examples and the answers interviewers want to hear.
Python Find String Position in List — .index() and 4 Other Ways
Need to find where a string lives in a Python list? Here's every approach from the dead-simple .index() to finding ALL occurrences — plus what to do when it's not there.
Check Python Version — 5 Ways, From Terminal to Script
"Which Python am I even running?" — a question every developer has asked at 11pm. Here are 5 ways to check your Python version, from dead simple to programmatic.
Python String Contains — Every Way to Check (Ranked)
There are like 6 different ways to check if a Python string contains a substring. Here's which ones you should actually use, and which ones are just showing off.
Python Enum — Stop Using Magic Strings and Constants Already
If you're still scattering magic strings across your Python code, enums are about to change your life. Here's everything you need to know about Python Enum — with actual, practical examples.
Python Try Except — Error Handling That Doesn't Suck
Bare except: pass is a crime. Here's how to actually use Python try except — specific catches, else clauses, finally blocks, custom exceptions, and real-world patterns.
Python enumerate() — The Loop Trick You're Probably Not Using Enough
Still writing range(len()) in your Python loops? enumerate() is the built-in you should've been using all along — here's how to actually use it.
Python List — Everything You Need to Know (With Actual Examples)
Python lists look simple until mutable defaults eat your afternoon. Here's the real guide — methods, slicing, comprehensions, and the gotchas nobody warns you about.