Alberto Montalesi — software developer, author of The Complete Guide to Modern JavaScript, and builder of web and mobile apps.
Mercator maps make Greenland look close to the size of Africa, although Africa is roughly fourteen times larger. Map2Maps lets you select a country or draw a shape and compare it across up to four map projections.
A free browser-based tool for generating App Store screenshots: device mockups at the required resolutions, captions, backgrounds, translation into 18 languages, and ZIP export. No account or screenshot upload required.
Valuta is an iPhone currency converter with a calculator keypad built in, so you can convert a price and then split it, add tax, or multiply it without switching apps. It saves recent rates for offline reference, stores favorite currency pairs locally, and has a one-time purchase with no account.
Yore is a local-first iPhone app that replaces half a dozen single-purpose trackers with one library, log, and diary for movies, TV, anime, books, manga, games, music, podcasts, board games, and comics, with metadata pulled from public, no-key sources.
Battle Tanks is a free browser-based, top-down tank arena shooter built with Three.js and WebGPU: classic Battle City energy (drive a tank, blast bricks, defend a base) layered with a modern roguelite power-up ladder, boss fights, and local co-op. No download, no install.
ARCOLOGY is a free browser-based cyberpunk city builder made with Three.js, where you grow a neon district into a profit machine while keeping three rival factions in balance. The economy was tuned by exporting every run as JSON and iterating on the data instead of guessing.
Provato is a local-first iPhone app for tracking restaurants and cafes you tried or want to try, with notes, ratings, photos, locations, history, and wishlist items. It is built for the specific problem of forgetting which coffee shop was worth returning to.
Why I moved this Next.js blog off Vercel to Cloudflare Workers: the April 2026 security incident, the pricing math, and the technical steps of swapping in OpenNext and replacing the unmaintained Contentlayer with Velite.
Baby Book Tracker is a simple, local-first iOS app for logging reading sessions with your baby, tracking progress toward goals like 1000 Books Before Kindergarten, and sharing the routine with caregivers. No account is required, and full access is a one-time unlock rather than a subscription.
If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23.
Complete the method/function so that it converts dash/underscore delimited words into camel casing.
Write a function cakes(), which takes the recipe (object) and the available ingredients (also an object) and returns the maximum number of cakes Pete can bake (integer).
Implement a function likes :: [String] -> String, which must take in input array, containing the names of people who like an item. It must return the display text as shown in the examples.
Write a function that takes an array of values and moves all elements that are zero to the end of the array, otherwise preserving the order of the array. The zero elements must also maintain the order in which they occurred.
Complete the function scramble(str1, str2) that returns true if a portion of str1 characters can be rearranged to match str2, otherwise returns false.
Move the first letter of each word to the end of it, then add 'ay' to the end of the word. Leave punctuation marks untouched.
Learn the new features that will become part of JavaScript with the ES2022 specification
Learn the new features that will become part of JavaScript with the ES2021 specification
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Learn how to find and replace elements in arrays with JavaScript. Learn how to use indexOf, filter, splice and more
Learn what is the difference between pass by value and pass by reference and understand how JavaScript uses them
Learn how to use more methods than just console.log and improve your debugging. Apply some style to your console methods and make your code more recognisable
It's easy to feel down during lockdown, don't waste your day in front of the TV, learn something new and stay motivated and positive
Learn how to create a plugin to allow users to highlight and tweet text from your pages
Add a copy to clipboard button with JavaScript in only 10 lines of code
Learn how you can implement dark mode to your website in two different ways
Learn how to create a dynamic table of contents for your articles and how to make it sticky, always at the top, with just a few lines of code
Learn everything from the basics to the latest features of ES2019 and practice with quizzes and coding challenges in this interactive course
A list of 10 must know string methods that every JavaScript developer should know. Includes a downloadable set of flashcards.
Learn all the new features introduced to JavaScript from ES2016 to ES2019 and download a cheatsheet to bring with you
Supercharge your Markdown with MDX and implement components inside your articles with this plugin for Gatsby
A list of my favorite plugins to use on a static site created with Gatsby. Use these plugins to improve your blog quickly and easily
Automate tweeting by leveraging Google Scripts, post a new tweet everyday from a Google Sheet file
Learn how to use CSS Variables to write cleaner and more reusable stylesheets
Discover one of the most anticipated upcoming features of JavaScript, optional chaining and start using it right now
Get yourself a new laptop, suitable for all your needs as a programmer, for under 800 dollars
Taking notes is a vital part of the job of programmer and these apps will help you easily take notes that you can export and save in different formats
Arguably, the most fun part of installing a new IDE is to check out the extensions available. In this article I will tell you the 5 I think every developer should install
Use only JavaScript and create a Pomodoro Clock in one hour and complete this project inspired by the FreeCodeCamp curriculum
Learn how to create a random quote generator using a public API and JavaScript and complete this project inspired by the FreeCodeCamp curriculum
In this tutorial you will learn how to create a simple smooth scrolling navigation menu with JavaScript that works on every browser
Hi, my name is Alberto, and this is the story of how I learned to code, wrote a programming book, started my own blog and became a software developer.
Learn how to create a simple, responsive carousel with JavaScript. Use it to display images or testimonials on your website
Using only HTML, create a responsive,mobile friendly, beautiful login form to attract users to register your website. No JavaScript required.
Download this cheatsheet with all the new features introducedo to JavaScript from 2016 all the way to ES2018
Learn how to create a to do list with only JavaScript. Add and remove items with just a few lines of code
Let's have a look at what I consider to be the best resources to learn Ruby on Rails
Let's have a look at 4 free resources where you can get started with CSS Grid.