Yarn Workspaces: Organize Your Project’s Codebase Like A Pro

Yarn workspaces let you organize your project codebase using a monolithic repository (monorepo). In this article, Jorge explains why they’re a great tool and how to create your first monorepo using Yarn with basic npm scripts, and add the required dependencies for each app.

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Agile is dead: SCRUM implementation survival guide

Dave Thomas, one of the creators of the Agile Manifesto, has declared Agile as dead, stating that the values of being agile have been totally lost behind the implementation.

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Exploring Sets and Maps in JavaScript

The objective of these new constructs is to provide easier and more efficient ways to structure and access data under certain use cases. In this article, we will look at how Sets and Maps work and explore some of the operations that can be performed on them. A collections of values.

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Cypress: a new kid on the E2E block

Those of us familiar with E2E testing a user interface, we all know the struggle. Not only coding with waits and timeouts but setups that were harder to manage especially when running it on a continuous integration platform. Maintaining versions, network issues, browser support, …

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Web Workers with Angular CLI

Although web workers have been around for a while, frontend engineers seem to avoid using them in projects. There is some documentation on the Angular website, but this article will show how to…

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Yarn support for security alerts

GitHub security alerts help developers stay on top of vulnerabilities that impact their dependencies. JavaScript developers already receive alerts for their NPM-based projects that use package.json and package-lock.json manifests.

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16 Cool Projects for Your New Raspberry Pi 4

Join 250,000 subscribers and get a daily digest of news, articles, and more. Whether you’re in the market for a Pi 4 or you already have one sitting alone in a drawer, you’re probably in need of some cool project ideas. Don’t fret—you have a ton of options.

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Automatically detect memory leaks with Puppeteer

About half a year ago Bronley Plumb kindly made me aware of a memory leak in one of my open-source packages. To see this memory leak in action it was necessary to open a browser and its dev tools to execute some manual steps. On top of that, the memory had to be inspected manually.

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Using Jest and Enzyme for testing React Apps

Testing your code is probably one of the most important things to do in software engineering. With testing we ensure quality of what we are building. There are many ways to test code, from end to end testing (manual testing) to unit testing (component testing in React).

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How to Test React Components Using Jest

This article is by guest author Jack Franklin. SitePoint guest posts aim to bring you engaging content from prominent writers and speakers of the JavaScript community.

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5 Commandments for TypeScript programmers

More and more projects and teams are adopting TypeScript. However, there is a massive difference between just using TypeScript and taking the most out of it. Types are a contract.

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Top 10 Websites to Learn Coding (Interactively) Online

Gone are the days when programming languages could only be mastered programmers like Bill Gates, who later got to dominate the world by storm. Now everyone holds the same potential, and the chance to learn and even master programming language easily.

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Yeah hooks are good, but have you tried faster React Components?

5 simple tips to improve the performance of a React application Note: This article is not meant to perf-shame you. If you’re a beginner in React, don’t focus on performance issues but rather on getting comfortable and productive with it.

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The Interviewer Who Cursed Me Out and Changed My Life

“Why don’t you walk out the door, not only because you’re not going to get this job, but also because you actually don’t want this job. You’re not a writer and you’ll never be. Prove me wrong.” I sat there fuming and ready to both punch this man in the face and hug him.

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React Hooks in TypeScript

Released in React v16.8.0, React Hooks address a number of issues with React, and perhaps most notably for TypeScript users, provide a first-class solution for reusing stateful logic, built with typing in mind.

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Visual Regression Testing with Puppeteer & Jest

In this tutorial, we will set up a small project with automated visual tests using Puppeteer, Jest and VisWiz.io. Puppeteer is a Node.js library which provides a high-level API to control headless Chrome. It is a great tool to perform browser automation tasks.

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These Tips Will Boost Your React Code’s Performance

React is popular, because React applications scale well, and are fun to work with. Once your app scales, you might want to consider optimizing your app. Going from 2500ms wait time to 1500ms can have…

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Setup create-react-app with Tailwind CSS

Recently, I've been having fun with writing front-end code using utility-first CSS frameworks instead of full-blown toolkit ones like Bootstrap and Bulma. It helps me build and customize my page components immediately without having to write my own CSS from scratch.

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CSS Utility Classes and "Separation of Concerns"

Over the last several years, the way I write CSS has transitioned from a very "semantic" approach to something much more like what is often called "functional CSS.

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The Top Tech People to Follow on Twitter for Your Stack

Twitter like other social media bring people together, and lots of everyday activities go on here too, people get jobs, sell, connect, work and even get items for free. This brings in the question of CROWD CONTROL.

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Improve Your JavaScript Knowledge By Reading Source Code

Do you remember the first time you dug deep into the source code of a library or framework you use frequently? For me, that moment came during my first job as a frontend developer three years ago. We had just finished rewriting an internal legacy framework we used to create e-learning courses. At the beginning of the rewrite, we had spent time investigating a number of different solutions including Mithril, Inferno, Angular, React, Aurelia, Vue, and Polymer.

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JavaScript Ternary Operators

Here we have a CodePen similar to the earlier examples. Feel free to play around with this and see how we can use JavaScript ternary operators. Ternary operators are just an operator that accepts 3 parts.

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Faster web navigation with predictive prefetching

Learn about predictive prefetching and how Guess.js implements it. In my "Faster Web Navigation with Predictive Prefetching" session at Google I/O 2019, I began by talking about optimizing web apps with code-splitting and the potential performance implications for subsequent page navigation.

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Higher Order Components in a React Hooks World

For most people working with regularly with React, it’s hard to go very far without encountering higher-order components (or HoC’s). To the uninitiated, it is a pattern that leverages React’s…

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11 React Testing Tools and Libraries for 2019

Most people use Jest to test their components. Probably, with Enzyme and a couple of other utils. But, while FB recommends Jest as their React testing Framework of choice, the open source ecosystem for testing React applications is rich in frameworks and tools.

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How to Test React Components using Jest and Enzyme

I’ve made a simple search app which calls to the Guardian API to retrieve articles and display the results to the user. First I will show you the functional app code, followed by unit tests and then followed by integration tests.

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React State with Hooks: useReducer, useState, useContext

If you haven’t used state management excessively in React Function Components, this tutorial may help you to get a better understanding of how React Hooks – such as useState, useReducer, and useContext – can be used in combination for impressive state management in React applications.

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The Circle of a React Lifecycle

A React component goes through different phases as it lives in an application, though it might not be evident that anything is happening behind the scenes.Those phases are: mounting, updating, unmounting, error handling. There are methods in each of these phases that make it possible to perform specific actions on the component during that phase. For example, when fetching data from a network, you’d want to call the function that handles the API call in the componentDidMount() method, which is available during the mounting phase.

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How to See if Zoom Is Running a Secret Web Server on Your Mac (and Remove It)

Zoom, a popular video-conferencing application, is in hot water today. The Mac version runs a secret web server in the background—even after you uninstall it!—that can be used to reinstall Zoom and even turn on your video camera.

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Testing Stateful React Function Components with React Testing Library

With the introduction of React Hooks, there is more of an incentive to write function components in React since there is no longer a need use classes when building components.

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6 tips for better React performance

When I first started to learn React I was all for knowing all the little tips & tricks to increase performance.

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Kyle Simpson: I’ve Forgotten More JavaScript Than Most People Ever Learn

Kyle Simpson is, perhaps, the most highly-anticipated speaker of JSNation Conference 2019: he holds workshops on June 5 & 6 and gives a keynote address on June 7. Kyle is a living JavaScript classic, the truest embodiment of the spirit of open source.

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A Closer Look at React Memoize Hooks: useRef, useCallback, and useMemo

The best way to understand what memoize hooks are is to expose ourselves to the problem space which these hooks solve. Starter hooks examples don’t expose these problems. They make hooks look approachable and straightforward— which makes complete sense.

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Beware! Angular can steal your time.

Small gotchas from my(and not only my:) Angular experience. Angular can do everything — or almost everything. But sometimes this ‘almost’ makes you waste time for coding workarounds or trying to find out why something happens or doesn’t work as expected.

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The State of Angular in 2019

It’s that time of the year when conferences and events are happening all over the world and we are bombarded with an amount of information that is pretty hard to digest. The Front End world is a never-stopping machine and we all know how hard it is not to stay behind.

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Terms You Need to Know as a JS Developer

In this article, we will focus specifically on things you need to know about JavaScript, to get up and going as a JS developer. JavaScript is dynamic typed. This means that variables can hold values of any type, without any type enforcement. The following build-in types are available:

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Bringing new CSS techniques to production

We—people making websites—have been designing and building responsive websites for the best part of ten years. Responsive websites are designed to be accessible at any display size we can reasonably anticipate being used to browse the web.

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The Future of Websites: Headless CMSs

Since their introduction, content management systems **(CMS**) have made life easier for website developers, site owners, and administrators alike. Platforms like WordPress, Joomla, and Drupal account for more than 60% of all web content platforms.

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The cost of JavaScript in 2019 · V8

One large change to the cost of JavaScript over the last few years has been an improvement in how fast browsers can parse and compile script. In 2019, the dominant costs of processing scripts are now download and CPU execution time.

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The 10 Component Commandments

Written in collaboration with Caroline Odden. Based on the talk with the same name and people, held at the ReactJS Oslo Meetup in June 2019. Creating components that are used by a lot of people is hard.

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The Designer’s Growth Model

Borrowing from the Invision report The New Design Frontier and the Greiner growth model (good designers copy, great designers steal), I concocted a model for the evolution of the designer. Just like the famous Greiner growth model, my model has different phases.

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Placing, Spanning and Density in CSS Grid

The most common things you learn in CSS Grid is usually related to the grid container and less about the grid items. A generic grid definition applied to the grid container is enough for a basic layout structure.

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Code Organization in Functional Programming vs. Object Oriented Programming

A co-worker asked about code organization in Functional Programming. He's working with a bunch of Java developers in Node for a single AWS Lambda, and they're using the same style of classes, various design patterns, and other Object Oriented Programming ways of organizing code.

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Creating a Design System: Our Approach and Experiences

Creating a design system is one of the services we offer at Netguru. So far, we’ve created design systems for either enterprise-size or smaller companies. Our approach and process are based on our experiences and the issues we’ve encountered so far.

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Building a Conference Schedule with CSS Grid

Twitter Facebook Sessions of variable length (limited to set time increments) Imagine back-to-back one-hour talks in three rooms alongside a two-hour workshop in another. Sessions spanning one or more "Tracks" Tracks are usually associated with a specific room in the venue.

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