Code Complete: JS Practice

Code Complete is a free, offline place to practise writing JavaScript. Pick an exercise, read the problem, write your solution, and run it against real tests right on your device. You see which tests pass, what was expected and what your code returned, plus anything you logged to the console. 51 EXERCISES Arrays and matrices, strings, math, dynamic programming and search, data structures (linked lists, trees, sets, buffers, zippers) and graph and grid problems, from easy warm-ups to puzzles that take an evening. A REAL EDITOR • Syntax highlighting, line numbers and auto-indent • Straight quotes, always; no autocorrect getting in your way • Adjustable text size LEARN AT YOUR OWN PACE • Up to three progressive hints per exercise, from a nudge to the key idea • A reference solution when you want to compare approaches • Your code and progress are saved automatically RUNS ON YOUR DEVICE Your code runs in an isolated, on-device JavaScript sandbox. Infinite loops are stopped safely, and nothing is ever sent anywhere. PRIVATE AND FREE No account, no ads, no in-app purchases and no tracking. Code Complete collects no data. The exercises are adapted from the Exercism JavaScript track and used under the MIT License, with credit in the app. The hints are written for Code Complete.