Code Completion 5 Challenges

Complete the code: Real-World Patterns

Fill in the missing pieces of pageviews, error reports, crash queues, and restore pings.

Advanced ~4 min read

The pageview ping's payload marker.

js Your answer

flusher.on('hidden', () => {
  sendBeaconSafe('/collect', {
    type: '',
    url: location.pathname,
    ref: document.referrer,
  });
});

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js Your answer

window.addEventListener('error', (e) => {
  const report = { message: e.message, stack: e.error?.stack };
  navigator.sendBeacon('/errors', );
});

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js Your answer

function reportCrash(payload: Crash) {
  .setItem('crash-queue', JSON.stringify([...queued(), payload]));
  sendBeaconSafe('/crashes', payload);
}

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js Your answer

window.addEventListener('pageshow', (e) => {
  if (e.persisted) track({ type: 'pageview', : 'bfcache_restore' });
});

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js Your answer

export const sdk = {
  track(event, data) { queue.push({ event, data }); },
  () { return flusher.flush(queue.splice(0)); },
};

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