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JavaScript track

The language of the browser: values, types, functions and control flow in modern ES2023 JavaScript.

javascript track

Ordered the way it's meant to be learned — each lesson assumes the ones before it.

9 lessons live

JavaScript Foundations

Values, types, functions and control flow in modern JavaScript - the language skills every later module builds on.

  1. JavaScript Foundations: Values, Variables & TypesHow JavaScript represents data: values, the primitive types, const and let bindings, template literals, and deliberate type conversion.35 minbeginner
  2. JavaScript Foundations: Functions & Control FlowReusable logic in JavaScript: function declarations, expressions and arrows, return values, branching with if/else and switch, looping with for and for..of, and guard clauses.40 minbeginner
  3. JavaScript Foundations: Arrays & ObjectsThe two workhorse structures of JavaScript: ordered arrays with their core methods, labeled objects, dot versus bracket access, and nesting them together.40 minbeginner
  4. JavaScript Foundations: Iterating & TransformingWorking over collections in practice: plain loops, map, filter, reduce, find, some and every - what each returns, and honest guidance on choosing between them.40 minbeginner
  5. JavaScript Foundations: Scope & ClosuresWhere variables live and who can see them: block scope, the var pitfalls let and const fix, and closures - functions that remember their birth environment.40 minbeginner
  6. JavaScript Foundations: Error Handling & DebuggingFailures as a normal part of programming: throwing meaningful errors, try/catch/finally, reading stack traces, and debugging habits that catch bugs early.35 minbeginner
  7. JavaScript Foundations: Objects in PracticeObjects doing real work: methods and a first look at this, iteration with keys and entries, destructuring with defaults, and copying and merging with spread.40 minbeginner
  8. JavaScript Foundations: JSON & Data ExchangeData as text: what JSON allows and forbids, stringify and parse with their options, round-tripping nested values, and parsing untrusted input safely.35 minbeginner
  9. JavaScript Foundations: Capstone — The Word AnalyzerBuild a word-frequency analyzer: normalize text, count words with an object, sort the entries, report the leaders, and guard risky parsing with try/catch.45 minbeginner

Part of the Web Developer path