JavaScript® (often shortened to JS) is a lightweight, interpreted, object-oriented language with first-class functions, most known as the scripting language for Web pages, but used in many non-browser environments as well such as node.js or Apache CouchDB. It is a prototype-based, multi-paradigm scripting language that is dynamic, and supports object-oriented, imperative, and functional programming styles.

javascript

Generators are a useful tool for handling asynchrony in your JavaScript applications. They were added to JavaScript with ES2015. When applied correctly they allow us to write asynchronous code that looks synchronous.

They also turn one of JavaScripts core paradigms on its head. Contrary to normal functions, generator functions can be paused and resumed at any arbitrary point in time with the yield keyword.

This course will walk you through the basics of generators so you’ll be able to use them in your applications without ripping your hair out!

ES6 generators make it possible to pause and resume function execution at arbitrary points. This video will introduce you to the basics of generators with the yield keyword.

Use JavaScript (ES6) generators to pause function execution

We can communicate between generators and their instances with strategically placed yield keywords. This video will show you how to make it happen based on a simple example.

Send messages to and from JavaScript (ES6) generators

One can throw an error in a generator from the outside with it.throw(). Since all the code inside of a generator is synchronous, we can use the standard try/catch method of handling errors!

Error handling in JavaScript (ES6) generators

Generators are iterables, meaning we can easily iterate over the yielded values with a for-of loop. This video demonstrates this based on a simple counter example.

Iterate over JavaScript (ES6) generators

We can execute generators from generators, and delegate the iteration control with the yield* keyword.

Yo dawg, I heard you like generators, so I put generators inside your generators.

Delegate JavaScript (ES6) generator iteration control

With one tiny utility function we’ll unlock the full power of generators to make them work well with Promises and thus be the perfect weapon for asynchronous flows in our apps.

Write simple asynchronous code with JavaScript generators

Max Stoiber

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