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JavaScript: Uncharted

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JavaScript

Start from your very first line of code and go all the way: functions, closures, classes, async, the event loop, data structures, and algorithms. All in the world's most-used language, all hands-on.

Easy to Intermediate to Hard
20 units
400 lessons

Follow the units in order, or explore any lesson that interests you.

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Course syllabus

20 units

1. Hello, JavaScript
Write your first instructions, see how literal sequencing works, and make JavaScript move a courier.
20 lessonsStart here
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2. Remember with Variables
Name fixed facts, update changing values, choose readable identifiers, and trace state one statement at a time.
20 lessons
3. Numbers and Text
Turn familiar arithmetic into JavaScript, tame rounding surprises, and build polished text from changing values.
20 lessons
4. Making Decisions
Turn comparisons into clear choices with boolean logic, if/else branches, and ordered decision ladders.
20 lessons
5. Loops
Turn repeated work into clear while and for loops, then control, nest, and accumulate across real routes.
20 lessons
6. Functions
Name reusable behavior, personalize it with parameters, return useful values, and compose small functions into larger programs.
20 lessons
7. Arrays
Create ordered collections, update their contents, traverse them with loops, and search or copy useful ranges.
20 lessons
8. Objects
Group named values into object shapes, access changing properties, model nested data, and move objects through JSON.
20 lessons
9. Strings in Depth
Search, normalize, split, rebuild, and craft text that holds up under real-world input.
20 lessons
10. Array Superpowers
Transform, select, combine, search, check, sort, and chain arrays with methods that reveal each job’s shape.
20 lessons
11. Scope and Closures
Resolve names through nested scopes, capture lexical environments, and build private stateful functions with closures.
20 lessons
12. Functions as Values
Pass behavior as data, return configured functions, curry reusable settings, and compose clear pipelines.
20 lessons
13. Recursion
Build reliable base cases, trace call-stack frames, traverse nested structures, and choose recursion when the problem shape earns it.
20 lessons
14. Objects with Behavior
Combine receiver state with classes, shared prototype methods, and inheritance to model capable objects.
20 lessons
15. Errors and Robustness
Read failures as evidence, design clear error contracts, guard boundaries, and debug with a repeatable method.
20 lessons
16. Asynchronous JavaScript
Schedule callbacks, work with promises, write readable awaited flows, and coordinate independent jobs.
20 lessons
17. How JavaScript Runs
Trace the event loop and its queues, reason about hoisting, and explain coercion and memory references.
20 lessons
18. Data Structures
Measure growing work, build linear and hashed structures by hand, and organize searchable trees for the operations a program needs.
20 lessons
19. Algorithms
Search efficiently, build sorting strategies, traverse graph relationships, and reuse solved subproblems.
20 lessons
20. The Hero Road
Read unfamiliar systems, refactor deliberately, combine course-wide tools, and ship a deterministic dispatcher.
20 lessons

400 lessons across 20 units. Start with any published unit.