javascript – Page 5

Natively Format JavaScript Dates and Times

Elijah Manor digs into Date’s toLocaleDateString() and toLocaleTimeString() methods to format Dates and Times in JavaScript, with respect to a passed locale. const date = new Date(); console.log(date.toLocaleDateString(‘en-US’)); // 7/19/2020 const dateOptions = { weekday: ‘long’, year: ‘numeric’, month: ‘long’, day: ‘numeric’, }; console.log(date.toLocaleDateString(‘en-US’, dateOptions)); // Sunday, July 19, 2020 console.log( date.toLocaleDateString(‘fr-FR’, { month: ‘long’, …

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Tachometer – Statistically rigorous benchmark runner for the web

From the Polymer team: Tachometer is a tool for running benchmarks in web browsers. It uses repeated sampling and statistics to reliably identify even tiny differences in runtime. To compare two files, run it like so: npx tachometer variant1.html variant2.html Tachometer will open Chrome and load each HTML file, measuring the time between bench.start() and …

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ESNext: Import Assertions (JSON Modules, CSS Modules, …)

Did you know you can import JSON and CSS files just like you import JavaScript Modules? Thanks to Import Assertions, it’s as easy as this: Building upon "Import Assertions" we recently saw JSON Modules land in V8/Chromium 91: “`import json from './foo.json' assert { type: 'json' };“` In Chromium 93 the same thing for CSS …

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Google Maps JavaScript API WebGL

I’m a huge mapping nerd, so I’m a sucker for the Maps JavaScript API WebGL beta which was announced at Google I/O back in May: Introduced are three new features: WebGL Overlay View lets you add custom 2D and 3D graphics and animated content to your maps. Tilt and heading can now be adjusted programmatically, …

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Percollate — A command-line tool to turn web pages into beautiful, readable PDF, EPUB, or HTML docs.

Percollate is a command-line tool that turns web pages into beautifully formatted PDF, EPUB, or HTML files. Installation per NPM npm install -g percollate Once installed you can, for example, run this: percollate epub https://brm.us/at-layer -o css-at-layer.epub Percollate will automatically extract the main content (powered by Mozilla’s Readability.js), perform some enhancements on it (such as …

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CodeSwing — Interactive Coding Playground (like CodePen, JSFiddle, etc.) Extension for Visual Studio Code

The Visual Studio Code extension named “CodeSwing” just blew my socks off. CodeSwing is an interactive coding playground for VS Code, that allows you to build/explore/learn rich web applications (“swings”). It’s like having the magic of a traditional web playground (e.g. CodePen, JSFiddle), but in Visual Studio Code! Using the Command Palette you can create …

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Partytown: Run Third-Party Scripts off the Main Thread in a Web Worker

The folks from builder.io set out to create a way to prevent Third-Party Scripts from blocking the main thread. The result is Partytown, which runs Third-Party Scripts Within a Web Worker. Partytown is able to sandbox and isolate third-party scripts within a web worker and allow, or deny, access to main thread APIs. This includes …

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Motion One — WAAPI Powered Animation Library

A new animation library, built on the Web Animations API for the smallest filesize and the fastest performance. import { animate } from “motion” const boxes = document.querySelectorAll(".box"); animate(boxes, { backgroundColor: "red" }); Motion One → Be sure to also read the “Improvements over WAAPI” page.

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“Learn Alpine.js“ Free Video Course

Over at Codecourse you can follow a free video course covering the aforementioned Alpine.js. Alpine.js is a refreshingly minimal JavaScript framework that gives you the reactive nature of Vue and React, but with much more simplicity. This course will get you up to speed on how to use it, with plenty of practical examples along …

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`perfect-freehand` — Draw perfect pressure-sensitive freehand lines

What a wonderful package by Steve Ruiz: Draw perfect pressure-sensitive freehand lines The results are stunning imo. In the recording above you can see me write hello using the trackpad on my Mac. Yep, that’s without a stylus! Embedded below you can find a Vanilla JS demo, inspired upon the code from the React code …

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