Explore verified, runnable programming examples, algorithmic walkthroughs, and code breakdowns across all major languages. Test code live in your browser.
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Readable, high-level programming for scripting, data analysis, automation, and backend development.
The language of the modern web and Node.js backend systems, featuring asynchronous event loops and dynamic objects.
Typed superset of JavaScript bringing compile-time safety, interfaces, and powerful generic data structures.
Low-level imperative systems language focusing on memory control, pointers, and direct hardware interaction.
High-performance object-oriented and systems programming with STL containers, templates, and deterministic destructors.
Class-based, object-oriented enterprise language designed for JVM portability, robust standard libraries, and multithreading.
Fast, compiled, statically typed language created at Google with native goroutines and lightweight concurrency channels.
Empowering systems programming with zero-cost abstractions, guaranteed memory safety, and fearless concurrency.
Modern, object-oriented language for .NET development, game engines (Unity), cloud services, and LINQ data manipulation.
Server-side web scripting language powering dynamic applications, APIs, and modern frameworks like Laravel.
Concise, null-safe modern JVM language that powers modern Android development and multiplatform applications.
Powerful, safe, and intuitive language developed by Apple for iOS, macOS, watchOS, and server-side apps.
Client-optimized programming language for multi-platform UI applications with Flutter and fast ahead-of-time compilation.
Dynamic, open source programming language with a focus on developer happiness, elegant syntax, and productivity.
Lightweight, embeddable scripting language widely used in game engines (Roblox, World of Warcraft, Defold) and Redis.
Specialized programming language and environment for statistical computing, data analysis, and graphical techniques.
High-level, high-performance dynamic language designed for numerical, mathematical, and scientific computing.
Highly capable, feature-rich programming language with exceptional regular expression and text-processing powers.
Purely functional, statically typed programming language with lazy evaluation, algebraic types, and strong safety.
Top requested algorithmic solutions, data structure implementations, and language fundamentals.
A prime number is a positive integer greater than 1 that has no positive divisors other than 1 and itself. This example demonstrates an optimized approach checking factors up to √n.
The Fibonacci sequence is a series where each number is the sum of the two preceding ones, starting from 0 and 1. Here we implement iterative generation and generator streaming.
Explore the fastest and most idiomatic ways to reverse a string in Python, including slicing, reversed() iterator, and the two-pointer approach.
Check whether a string or integer reads the same forwards and backwards, with case and whitespace sanitization.
Binary Search finds the target element in a sorted list by repeatedly dividing the search interval in half.
Find two indices in an array whose values sum to a specific target in optimal O(N) linear time using a hash map lookup.
Find the longest contiguous palindromic substring in a given string using the Expand Around Center technique.
Sort and merge overlapping interval pairs into disjoint sets using an efficient greedy scan.
Implement a high-performance Least Recently Used (LRU) Cache in JavaScript using the Map structure with O(1) get and put operations.
Validate whether brackets, braces, and parentheses are properly balanced and closed in matching order using a stack.
Learn modern and traditional techniques to reverse a string in JavaScript, including split-reverse-join, recursion, and for...of loops.
Determine if a word, phrase, or number reads identically backwards and forwards in JavaScript while ignoring non-alphanumeric characters.
Flatten arrays of arbitrary nesting depth into a single linear array using recursion, reduce, and modern flat() methods.
Implement a type-safe Last-In-First-Out (LIFO) Stack data structure in TypeScript with full generic parameterization and peek/pop protections.
Implement a Least Recently Used (LRU) Cache in TypeScript using a Map data structure to achieve O(1) get and put operations with type safety.
Check whether a given integer is prime in C using optimized trial division with square root boundaries in standard C11.
Reverse a null-terminated character array (string) in place using two raw memory pointers without allocating secondary buffers.
Demonstrates safe dynamic heap memory allocation in C, resizing buffers with realloc, and avoiding memory leaks with free().
Implement a high-performance LRU Cache in C++ using std::list for double-linked list ordering and std::unordered_map for O(1) key lookups.
Build an efficient Prefix Tree (Trie) in C++ supporting fast word insertion, full match search, and prefix matching.
Implement a template-based binary search algorithm in C++ and compare it with the Standard Template Library (STL) algorithms std::binary_search and std::lower_bound.
Implement the high-performance QuickSort divide-and-conquer sorting algorithm in C++ using in-place median/pivot partitioning.
Traverse a binary tree level by level using Breadth-First Search (BFS) with an ArrayDeque queue in Java.
Invert a binary tree by recursively swapping left and right child pointers.
Find two indices in an array of integers that add up to a specific target number using a single-pass HashMap in O(n) time.
Reverse strings in Java efficiently using StringBuilder and in-place char array two-pointer swapping.
Dispatch jobs across a pool of concurrent goroutine workers using buffered channels and sync.WaitGroup coordination.
Implement a token bucket request rate limiter in Go using time.Ticker and non-blocking channel selects.
Implement a concurrent worker pool pattern in Go using goroutines, buffered channels, and sync.WaitGroup to process tasks concurrently.
Reverse strings safely in Go by converting to []rune to handle multi-byte Unicode characters correctly without slicing bytes.
Safely mutate shared data across multiple OS threads in Rust using Arc (Atomic Reference Counting) and Mutex synchronization.
Implement a type-safe generic LIFO stack data structure in Rust with peek, push, pop, and empty check capabilities.
Implement an idiomatic binary search algorithm in Rust returning Option<usize> and compare it with the standard library slice method.
Implement in-place QuickSort sorting in Rust on mutable slices (&mut [T]) using generic trait bounds and safe borrow checking.
Learn how to filter, transform, and group data collections in C# using Language Integrated Query (LINQ) fluent syntax and query syntax.
Merge multiple associative or indexed arrays in PHP and remove duplicates efficiently using array_unique and array_values.
Check if a string is a palindrome in Ruby using clean standard methods and regular expressions.
Sort and iterate array and dictionary tables in Lua using table.sort with custom comparator functions.
Perform vector math, matrix multiplications, and statistical summaries in R.
Idiomatic Kotlin binary search algorithm with null-safety and list extension methods.
Generate Fibonacci sequences in Swift using functional sequences and memory-efficient iterators.
Compute Fibonacci numbers in Dart using iterative loops and optional sync* yield generators.
Perform vectorized scientific computations, matrix multiplications, dot products, and statistical summaries in Julia.
Implement an idiomatic recursive QuickSort algorithm in Julia with array filtering and pivot partitioning.
Parse a multiline text block in Perl, sanitize tokens using regular expressions, and tally word frequencies using hashes.
Classic declarative QuickSort in Haskell using pattern matching and list comprehensions.
Generate an infinite stream of Fibonacci numbers in Haskell using lazy evaluation and zipWith.