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JavaScript Tutorials

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    Detect Caps Lock with JavaScript

    Anyone is capable of having their caps lock key on at any given time without realizing so. Users can easily spot unwanted caps lock when typing in most inputs, but when using a password input, the problem isn't so obvious. That leads to the...

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    Date.now()

    Ask any software engineer and they'll tell you that coding date logic can be a nightmare. Developers need to consider timezones, weird date defaults, and platform-specific date formats. The easiest way to work with dates is to reduce the date to the most simple...

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    Extract a Number from a String with JavaScript

    User input from HTML form fields is generally provided to JavaScript as a string. We've lived with that fact for decades but sometimes developers need to extract numbers from that string. There are multiple ways to get those numbers but let's rely on regular...

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    AutoSave with VSCode

    Visual Studio Code has taken the crown of most used text editor, at least in JavaScript spheres. VSCode is fast, feature-filled, and supports thousands of plugins to boost productivity. Developers can also tweak hundreds of settings to enrich functionality. One such feature is...

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    How to Detect Failed Requests via Web Extensions

    One of the best things that ever happened to t he user experience of the web has been web extensions. Browsers are powerful but extensions bring a new level of functionality. Whether it's crypto wallets, media players, or other popular plugins, web extensions have...

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    Sum an Array of Numbers with JavaScript

    It's rare that I'm disappointed by the JavaScript language not having a function that I need. One such case was summing an array of numbers -- I was expecting Math.sum or a likewise, baked in API. Fear not -- summing an array of numbers...

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    JavaScript waitFor Polling

    As more of the JavaScript developers write becomes asynchronous, it's only natural to need to wait for conditions to be met. This is especially true in a world with asynchronous testing of conditions which don't provide an explicit await. I've written about waitForever, waitForTime...

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    queryLocalFonts

    One of the larger downloads when requesting a webpage are custom fonts. There are many great techniques for lazy loading fonts to improve performance for those on poor connections. By getting insight into what fonts the user has available, we can avoid loading custom fonts.

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    Use XHR/fetch Breakpoints!

    Web debugging tools are so incredibly excellent these days. I remember the days where they didn't exist and debugging was a total nightmare, even for the simplest of problems. A while back I introduced many of you to Logpoints, a way to output...

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    URL.canParse

    Parsing of URLs on the client side has been a common practice for two decades. The early days included using illegible regular expressions but the JavaScript specification eventually evolved into a new URL method of parsing URLs. While URL is incredibly useful when a valid URL...