Code Completion 5 Challenges

Complete the code: Decision Tree & Hybrid Transport

Fill in the missing routing logic of the hybrid sender.

Intermediate ~4 min read

The decision tree's first branch condition.

js Your answer

export function send(payload) {
  const dying = document.visibilityState === '';
  return dying ? viaBeacon(payload) : viaKeepalive(payload);
}

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js Your answer

const caps = detectBeaconCapabilities();
const transport = caps.fetchKeepalive ? 'fetch' : '';

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js Your answer

// both transports charge the same
const pool = ''; // 64 KiB, per fetch group

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js Your answer

function chooseAtTeardown(): Transport {
  return capabilities.sendBeacon ? { kind: '' } : { kind: 'fetch', keepalive: true };
}

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js Your answer

queue.push(event);
if (queue.length >= BATCH || visibility === 'hidden') {
  (queue.splice(0));
}

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