Asynchronous JavaScript Patterns

Async Control Flow Patterns

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LearnStep 1 of 3

Advanced Async Control Flow

Learning Objectives

•Implement concurrency limits to prevent resource exhaustion
•Build async queues for sequential or batched task processing
•Use AbortController to cancel pending asynchronous operations
•Apply timeout patterns to handle hanging promises gracefully

Lesson Outline

LearnStep 1/3

Advanced Async Control Flow

Managing Concurrency

When dealing with a large number of asynchronous operations, such as fetching data for 100 items, firing them all at once via Promise.all can overwhelm the network or memory. A concurrency limit ensures only a fixed number of operations run simultaneously.

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Async Queues

Queues allow you to process tasks sequentially or in batches, useful for things like processing logs or database writes where order or load management matters.

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Cancellation with AbortController

Modern JavaScript uses AbortController to cancel asynchronous tasks like fetch or custom promises.

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Timeout Patterns

To prevent operations from hanging indefinitely, you can race a promise against a timeout.

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