JavaScript (Standalone Deep Dive)

Lessons

1. 1

   The JavaScript Engine and Event Loop

   Free

   Explain V8, the call stack, the task queue + microtask queue, and reason about async execution.

   Advanced·50 min
2. 2

   Closures and Scope

   Use lexical scope + closures intentionally; avoid the classic closure-in-loop bug.

   Intermediate·45 min
3. 3

   Prototypes and the Prototype Chain

   Explain prototypal inheritance + what ES6 classes compile to.

   Intermediate·45 min
4. 4

   Functional Programming in JS

   Use pure functions, map/filter/reduce, composition, partial application, currying.

   Intermediate·45 min
5. 5

   Browser vs Node Runtimes

   Distinguish browser globals from Node globals and pick APIs available in each.

   Intermediate·35 min
6. 6

   Modules: ESM vs CommonJS

   Use ES modules + interop with CommonJS in modern Node + bundlers.

   Intermediate·40 min
7. 7

   TypeScript in Depth (Advanced)

   Use generics, utility types, mapped types, conditional types, declaration files.

   Advanced·55 min
8. 8

   JavaScript Tooling

   Configure modern bundlers, transpilers, linters, formatters.

   Intermediate·40 min
9. 9

   Testing JavaScript

   Write unit + integration + e2e tests with Vitest, Testing Library, Playwright.

   Intermediate·45 min
10. 10

    JavaScript Security

    Defend against XSS, CSRF, prototype pollution, dependency CVEs.

    Advanced·45 min
11. 11

    Passion Project: Publish a JS Library

    Build, test, type, and publish a zero-dependency JS/TS utility library to npm.

    Advanced·180 min
12. 12

    JavaScript Job Readiness

    Translate deep JS skills into resume bullets and interview answers.

    Beginner·30 min