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A visual path through modern JavaScript. Every day has diagrams, a mind map, code you can edit and run right in the lesson, and a quick knowledge check.

  • 14 days
  • ~30 min / day
  • Beginner
  • Free account required
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Ready when you are

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Start Day 1

The big picture

Everything you'll cover, and how it fits together.

Mind map · click a dot to fold, drag to pan

Day by day

Go at your own pace. Your progress is remembered on this device.

  1. 1
    Day 1Up next 30 min

    Hello, JavaScript

    What JavaScript is, where it runs, and your first lines of code.

    Enginesconsole.log()Statements
  2. 2
    Day 2 30 min

    Variables & Types

    let, const and the values JavaScript works with.

    let / constPrimitivestypeof
  3. 3
    Day 3Coming soon 30 min

    Strings & Template Literals

    Build, slice and search text.

    Template literalsString methodsIndexing
  4. 4
    Day 4Coming soon 30 min

    Operators & Comparisons

    Math, equality and logic, including the tricky parts.

    === vs ==Truthy / falsy?? and ?.
  5. 5
    Day 5Coming soon 30 min

    Making Decisions

    Branch with if, else, switch and the ternary operator.

    if / elseswitchTernary
  6. 6
    Day 6Coming soon 30 min

    Loops

    Repeat work with for, while, for...of and for...in.

    forwhilefor...ofbreak / continue
  7. 7
    Day 7Coming soon 30 min

    Functions

    Declarations, arrow functions, parameters and return values.

    DeclarationsArrow functionsDefault & rest params
  8. 8
    Day 8Coming soon 30 min

    Arrays

    Lists of values and the methods that transform them.

    map / filter / reduceSpreadDestructuring
  9. 9
    Day 9Coming soon 30 min

    Objects & JSON

    Group data with objects and send it around as JSON.

    Object literalsMethods & thisJSON
  10. 10
    Day 10Coming soon 30 min

    Scope & Closures

    Where variables live and how functions remember them.

    Block scopeHoistingClosures
  11. 11
    Day 11Coming soon 30 min

    Classes & Prototypes

    Model things with classes, and see the prototypes underneath.

    classextendsPrototype chain
  12. 12
    Day 12Coming soon 30 min

    Errors & Modules

    Handle failures and split code into modules.

    try / catchthrowimport / export
  13. 13
    Day 13Coming soon 30 min

    Asynchronous JavaScript

    The event loop, promises and async/await.

    Event loopPromisesasync / awaitfetch
  14. 14
    Day 14Coming soon 30 min

    The DOM & Events

    Make a web page interactive, and build a small app.

    Selecting elementsEventsMini project