Platform under construction

Projects & Practice

Production

Counter Project

A counter project teaches state, events and rendering in the smallest possible app.

let count = 0;
function render() { output.textContent = String(count); }
button.addEventListener("click", () => { count += 1; render(); });

Projects & Practice

Counter Project turns lessons into working browser code.

A counter project teaches state, events and rendering in the smallest possible app.

Projects are where JavaScript starts to become real. You connect state, events, rendering, validation, async work and accessibility in one small feature.

Keep each project small enough to understand, but complete enough that it teaches a real workflow.

Core skill

state + render()

Build order

Start with HTML, add CSS, then connect JavaScript behavior.

State

Keep important values in JavaScript state, not hidden in random DOM text.

Review

Each project should include a self-check and one improvement idea.

Examples

Projects turn syntax into instinct.

Build from state to render

let count = 0;
function render() { output.textContent = String(count); }
button.addEventListener("click", () => { count += 1; render(); });

Let the DOM become accidental state

button.addEventListener("click", () => output.textContent++);
// State is hidden inside the DOM text.

Code patterns

Reusable examples for quick reference.

Use these examples as compact build exercises that connect multiple JavaScript skills.

Project pattern

A small version of the project idea.

let count = 0;
function render() { output.textContent = String(count); }
button.addEventListener("click", () => { count += 1; render(); });

Beginner trap

A shortcut that makes the project harder to maintain.

button.addEventListener("click", () => output.textContent++);
// State is hidden inside the DOM text.

Render function

Projects become cleaner when rendering is explicit.

function render() {
  output.textContent = String(state.value);
}

Status message

Tell users what happened after an action.

status.setAttribute("role", "status");
status.textContent = "Saved successfully.";

Rules that matter

Small projects should still be real projects.

A good practice project has state, interaction, feedback and a clear next improvement.

Start with a working HTML structure

The project should have meaning before JavaScript.

Name state clearly

Use arrays, objects or variables that describe the feature.

Write one render function

Rendering should be repeatable after state changes.

Handle empty and error states

Small projects still need real product thinking.

Keep accessibility visible

Use buttons, labels, status messages and focus deliberately.

Refactor after it works

First make it work, then make it clean.

Production thinking

Ship practice code with the habits of production code.

Why does this matter?

Projects make knowledge stick. They force separate topics to work together in the same page.

Accessibility

Every project should include semantic controls, labels and status feedback so the feature is usable beyond the happy path.

Production note

Production projects need file structure, tests, error handling and a clear release checklist once the prototype works.

SEO note

Project pages are useful learning content when the code, explanation and outcome are all visible.

Live code lab

Change the HTML, CSS or JavaScript and run the result.

The preview runs inside an isolated iframe. The JavaScript is placed inside the HTML editor for now, so every example stays together and remains easy to understand.

Mini assignment

Try this now.

Change one behavior in the project.
Add one empty, error or status state.
Explain where the project stores its state.

Practice assignment

Do this before moving to the next topic.

Rebuild the project from an empty HTML file.
Add one feature without changing the original structure too much.
Write three notes about what you would improve in production.

HTML + JavaScript CSS

Live preview

Self-check

Before you continue, prove that you understand Counter Project.