Edge Computing.

Worker runtimes, edge databases, streaming, caching, and global consistency at the edge. Covers 8 sub-skills.

• Edge Computing · 1 of 3

  Streaming at the Edge

  What Web API is used to create streaming responses in edge functions?

  AWritableStreamBReadableStreamCEventSourceDWebSocket

• Edge Computing · 2 of 3

  KV & Durable Objects

  What is the Durable Object 'alarm' API used for?

  AScheduling a future wake-up that fires without any incoming requestBMonitoring the object's memory usage and triggering garbage collectionCAlerting the developer dashboard when the object encounters an errorDSending push notifications to subscribed client WebSocket connections

• Edge Computing · 3 of 3

  Streaming at the Edge

  Comparing pipeTo(writable, { preventClose: true }) vs the default close-propagating pipeTo when chaining multiple upstreams into one client response, which use case is the option designed for?

  ASource ends but downstream is forced into a half-closed write windowBSource ends but downstream silently drops further enqueues thereafterCSource ends but downstream stays open for a follow-up sourceDSource ends but downstream re-opens once the writer's lock is released