Web Inspector vs JavaScript Challenge

Web Inspector expands Safari on iPhone and iPad with a set of web development tools: Elements: Browse the DOM tree and tap elements on the page to inspect them. View node details, styles, and computed values. Search the DOM, edit an element's HTML, and copy or delete nodes. Console: Type JavaScript commands to debug, modify, and get information about your webpage. Sources: Read the webpage's source with syntax highlighting. Network: See a list of network requests made by the webpage, with headers and responses. Filter requests, or copy one as a cURL command. Resources: Find details about the data stored by a webpage, such as cookies, local storage, and session storage. Tip: If you tap the Web Inspector button and nothing happens, reload the page once..

Feed your brain. Level up. Learn to write real JavaScript by solving one puzzle at a time, right on your phone. JavaScript Challenge is a single path of original coding problems, from your first function to graphs, dynamic programming and beyond. Every solution runs on-device in real JavaScript and is checked against hidden tests, so passing means it actually works. One purchase, everything included: every challenge ships with the app. No subscription, no in-app purchases, no ads, no account. WRITE REAL CODE • A coder keyboard built for JavaScript: tab, brackets, quotes, snippets, undo • Instant feedback with named tests, expected vs actual output • Some levels enforce rules (no built-in array helpers, recursion required) so you learn the technique, not the shortcut LEARN THE RIGHT WAY • Three-tier hints from Rhino, your smug but surprisingly helpful mentor • Curated solutions after you solve: naive vs optimal, time and space complexity • Topics: strings, arrays, objects, closures, recursion, dynamic programming, sorting, searching, graphs, trees, hashing, bit tricks, grids, greedy strategies, intervals STAY MOTIVATED • One path, no shortcuts: easy → medium → hard, with performance tests on the hardest levels • XP, player levels, daily streaks and badges • Six themes, dark and light PRIVATE BY DESIGN • Works offline, no account — your code and progress stay on your device • Only anonymous usage statistics, never your code; no tracking, no ads