Exercises

• 11.1 Proxy with pre-initialization queues: Using a JavaScript Proxy, create a wrapper for adding pre-initialization queues to any object. You should allow the consumer of the wrapper to decide which methods to augment and the name of the property/event that indicates if the component is initialized.
• 11.2 Batching and caching with callbacks: Implement batching and caching for the totalSales API examples using only callbacks, streams, and events (without using promises or async/await). Hint: Pay attention to Zalgo when returning cached values!
• 11.3 Deep async cancelable: Extend the createAsyncCancelable() function so that it's possible to invoke other cancelable functions from within the main cancelable function. Canceling the main operation should also cancel all nested operations. Hint: Allow to yield the result of an asyncCancelable() from within the generator function.
• 11.4 Compute farm: Create an HTTP server with a POST endpoint that receives...