Data Structures Basics vs CS++ Intro to Java

Data Structures Basics is an independent practice app for learners who want to build confidence with core computer science concepts before class, interviews, exams, or project work. Work through 160 questions across Fundamentals, Practical Skills, Common Pitfalls, and Advanced Concepts. Every question includes an explanation, so you can understand why an answer works instead of only memorizing it. Features: - FSRS spaced-repetition intervals for smarter review - Weak-point heatmap to spot topics that need attention - Daily challenge for consistent practice - Mock exams for timed review sessions - Offline practice for studying anywhere - No login required Use it to review arrays, linked lists, stacks, queues, trees, graphs, hashing, sorting, complexity, and common implementation mistakes. Independent study app for Data Structures Basics practice. Not affiliated with, endorsed by, or sponsored by any company, certification body, exam operator, or vendor. All trademarks belong to their respective owners. Practice offline, no login required.

CS++ Intro to Java is a complete first programming course for iPhone and iPad — 10 units and 31 lessons that take you from your very first println to 2D arrays, fully offline. Lessons embed 60 runnable Java coding challenges, 63 inline multiple-choice checks, and 22 Parsons problems — all executed on-device by a bundled Java interpreter. No account. No ads. No tracking. No internet required. WHAT'S INCLUDED • 31 lessons across 10 units — from your first program to 2D arrays • 60 runnable coding challenges — write real Java and run it on-device, no JDK, no compile server • 63 inline multiple-choice checks • 22 Parsons problems — drag code blocks into working order • Variables, operators, Strings, conditionals, loops, classes, arrays, ArrayLists, and 2D arrays • Everything works fully offline — progress stays on your device UNIT 1 IS FREE FOREVER Unit 1 — Getting Started with Java (3 lessons) is unlocked at install. Write and run real programs, and decide if the rest is worth $9.99. UNLOCK FULL INTRO TO JAVA — $9.99 ONE-TIME A single in-app purchase unlocks all 10 Intro to Java units (60 coding challenges): Unit 2. Variables & Primitive Types Unit 3. Operators & Expressions Unit 4. Strings & Using Objects Unit 5. Boolean Expressions & Conditionals Unit 6. Loops & Iteration Unit 7. Writing Your Own Classes Unit 8. Arrays Unit 9. ArrayLists Unit 10. 2D Arrays Pay once, keep forever. Restores on any device signed in to the same Apple ID. No subscription. Future content updates included. PRIVACY Everything runs on your device. The app does not require an account, does not collect personal information, does not include analytics or advertising, and does not track you across apps. Your progress stays on your device. See csplusplus.com/privacy for details. WHO IT'S FOR • Complete beginners writing their first line of code • Intro programming students who want practice anywhere, with or without Wi-Fi • Teachers who want a tablet-friendly tool for in-class practice • Anyone headed toward AP Computer Science A — the CS++ AP CSA course picks up right where this one leaves off For the full browser Java IDE, per-unit quizzes, and timed practice exams, visit csplusplus.com.