Sequencing callbacks
Writing Modern Async JavaScript
From raw callbacks to promises to async/await, everything you need to master async JS code with ease!
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Table of contents
Part 1: raw callbacks
Part 1: raw callbacks
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Intro, definition & optional asynchrony
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Examples of async APIs
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Pitfalls: Run-To-Completion & execution order
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Pitfalls: Exception propagation
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Pitfalls: Zalgo
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Pitfalls: late registration, missed calls and extraneous calls
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Sequencing callbacks
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Node-style callbacks
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Pitfalls inherent to Node-style callbacks
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Limitations inherent to callbacks
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Grouping and racing callbacks
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Debugging async code
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Outro part 1
Part 2: promises
Part 2: promises
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Intro and reminders on callback pitfalls
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Promises: an old concept
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Promises in the JS ecosystem and their native/emulated availability
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NOT just another way to write callbacks
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Terminology and principles
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Promise-based APIs
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NOT replaced by async/await
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Consuming a promise with .then()
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What about exceptions?
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Creating a promise
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Parallelizing promises
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Sequencing promises
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Timeouts, cancellation and future combinators
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Dedicated ESLint rules
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“Choose your poison” API design: callbacks + promises
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Outro part 2
Part 3: async/await
Part 3: async/await
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Intro and definitions
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Tons of benefits
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What is an async function?
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How await behaves
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More examples
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Anti-patterns
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Dedicated ESLint rules
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for…await…of and async iterators
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Outro part 3
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