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Python: Fast Data Filtering with List Comprehensions
Learn how to write elegant, idiomatic, and high-performance Python by replacing clunky loops with list comprehensions.
JavaScript: Modern Async/Await & Fetch API
Master asynchronous JavaScript using modern async/await syntax to fetch remote JSON data cleanly with try/catch error handling.
PHP 8.2: Modern Match Expressions & Array Mapping
Upgrade your PHP code from legacy switch statements to modern PHP 8.2 match expressions and type-safe array operations.
SQL: Multi-Table INNER and LEFT JOINs
Learn how relational databases connect records across disparate tables using INNER JOIN and LEFT JOIN operations.
Algorithm & Syntax Challenges
Short coding puzzles to test your programming skills
Reverse Words in a Sentence
Write a function everse_words(sentence) that reverses the order of words in a sentence while preserving whitespace between words.
Find Unique Numbers in Array
Given an array of integers where every number appears multiple times except one, write a function indSingleNumber(nums) that returns the unique integer.
Validate Domain Name Syntax
Write a PHP function isValidDomain(string ): bool that verifies whether a given string is a valid fully-qualified domain name (FQDN).