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JavaScript Tutorials

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    Recursive Array.flat

    There was much talk about Array.prototype.flat during its early stages, starting with the name alone. Many developers preferred the name flatten but the spec differed from MooTools' implementation. MooTools would recursively flatten an array but the new, official flat implementation defaults one level of flattening,.The current...

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    Using Array reduce

    Every developer who specializes in any programming language will tell you there's a powerful tool the language provides that they rarely use and wish they knew more about. For me, it's Array.prototype.reduce. I quite enjoy the other Array methods like map, filter, and find...

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    Type Conversion with JavaScript Arrays

    JavaScript's loose nature allows developers to employ amazing tricks to do just about anything you'd like. I've detailed how you can filter falsy values in arrays using a filter(Boolean) trick, but reader David Hibshman shared another trick for typecasting array values the same...

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    Flow Object.values(…)

    JavaScript typing utilities, like Flow and TypeScript, have become popular in JavaScript apps of all sizes. As I mentioned in our Script & Style Show typing podcast, typing is a great way to implicitly implement documentation and validation. Flow isn't always easy to...

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    JavaScript Detect Async Function

    JavaScript async/await has changed the landscape of how we code. We're no longer stuck in callback or then hell, and our code can feel more "top down" again.Async functions require the following syntax:To use await with a function, the function needs to be declared with...

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    7 Useful JavaScript Tricks

    Just like every other programming language, JavaScript has dozens of tricks to accomplish both easy and difficult tasks. Some tricks are widely known while others are enough to blow your mind. Let's have a look at seven JavaScript tricks you can start using today!Get...

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    Build a Decentralized Web Chat in 15 Minutes

    In this 15 minute tutorial we're going to build a simple decentralized chat application which runs entirely in a web browser.All you will need is a text editor, a web browser, and a basic knowledge of how to save HTML files and open them in the browser.

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    Adding Search to Your Site with JavaScript

    Static website generators like Gatsby and Jekyll are popular because they allow the creation of complex, templated pages that can be hosted anywhere. But the awesome simplicity of website generators is also limiting. Search is particularly hard. How do you allow users to search...

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    I Don’t Hate Arrow Functions

    TL;DRArrow functions are fine for certain usages, but they have so many variations that they need to be carefully controlled to not break down the readability of the code.While arrow functions clearly have a ubiquitous community consensus (though not unanimous support!), it turns out there's a...

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    Write Your First Service Worker in 5 Minutes

    What is a service worker?A service worker is a little file that will allow you to cache files and other assets on a user's machine. How is this different from server-side caching? Because the assets are stored on a user's machine, rather than a server...