javascript / expert
Snippet
Backpressure Handling in Async Generators
Async generators provide a natural way to implement backpressure. By awaiting a promise inside the generator before yielding, you can signal to the producer that the consumer is not ready for more data, effectively managing flow control in asynchronous streams.
snippet.js
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async function* streamProcessor(source) {for await (const chunk of source) {if (needsThrottling()) {await new Promise(r => setTimeout(r, 100)); // Simulate backpressure}yield transform(chunk);}}const consumer = async () => {for await (const data of streamProcessor(dataSource)) {console.log(data);}};
Breakdown
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async function* streamProcessor
Defines a generator that can await asynchronous operations between yields.
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for await (const chunk of source)
Consumes an asynchronous iterator while respecting its timing.