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Frontend interview practice you can run

Solve real UI tasks in the browser, run the tests, and then study the solution. Practice the same problem in React, Vue, Angular, or vanilla JavaScript.

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Every paid plan includes the same question library, framework variants, test runner, and solutions. Only the billing schedule changes.

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How practice works

From question to working answer, in the same workspace.

Write the code, check the tests, switch frameworks, and review the parts you missed. Each example below shows that part of the workflow.

Step 1 / Write and test

Write the answer and run the tests.

The prompt, editor, and test results stay in one workspace. Start from the provided files and see which case still fails before you submit.

  • Edit the real starter files
  • See every passing and failing test
UIReady / Step 1

Write the answer and run the tests.

Write and test

Debounce / JavaScript
All tests passed
debounce.jsEDITABLE
function debounce(fn, wait) {  let timer;  return function (...args) {    clearTimeout(timer);    timer = setTimeout(() => {      fn.apply(this, args);    }, wait);  };}
Test results
waits before calling
resets on another call
keeps latest arguments
All tests passed3 / 3

Step 2 / Switch frameworks

Change frameworks without changing the question.

Practice the same component in React, Vue, Angular, or plain JavaScript. Each variant has starter code written for that framework.

  • One prompt, four implementations
  • Separate saved progress for every variant
UIReady / Step 2

Change frameworks without changing the question.

Switch frameworks

Accordion questionpick your framework
React starterR
const [open, setOpen] = useState(false);

// Build the same behavior
toggleAccordion();

Live preview

HTML−

Gives the page structure and meaning.

CSS+
JavaScript+
Same task and tests. Framework-specific starter code.

Step 3 / Review the solution

See why your first answer missed an edge case.

Compare your code with the worked answer. The notes point to the failing case, the fix, and the reasoning you can explain in an interview.

  • Missed cases shown beside the code
  • Short implementation and complexity notes
UIReady / Step 3

See why your first answer missed an edge case.

Review the solution

Compare your attempt with the worked solution
Your attempt
function submit(value) {
  if (submitting) return;
  send(value);
}
Double click is blocked

4 tests passed

What the solution explains
1

The missed case

A fast second click starts another request.

2

The fix

Disable the action while the first request is pending.

3

Why it works

One guard prevents duplicate submissions.

Fixed answer4 / 4 tests pass
Free and Premium

Pay when you need the whole library

The free questions include the browser workspace. Premium adds the complete catalogue, every framework variant, and the worked solutions.

FeatureFreePremium
Free practice questions
In-browser test runner + autosave
Cross-device progress sync
Full premium question library
Multi-framework variants (React · Vue · Vanilla · Angular)
Detailed solutions, edge cases & complexity notes
New questions added regularly
FAQ

Billing and access questions

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We offer purchasing power parity pricing in many regions. If your country qualifies, Regional pricing is applied automatically, and you can turn it off from the pricing page. The displayed price is the checkout price.
Can I pay once instead of subscribing?
Yes. Choose 1-Year access for twelve months with no renewal, or choose Lifetime to keep access, including questions added later.
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