Top 5 favorite programming languages ​​today

Top 5 favorite programming languages ​​today

5 programming languages that every techie should master. From Java to Python, these language skills are in the highest demand for IT employers.Computer programming is one of the most demanded careers of the 21st century. This article will help you choose the best programming language for you...

5 programming languages that every techie should master. From Java to Python, these language skills are in the highest demand for IT employers.Computer programming is one of the most demanded careers of the 21st century. This article will help you choose the best programming language for you...

If you’re reading this, you’ve either decided to learn to code this year as a complete beginner or maybe you’re already a programmer and want to expand your skill set. Either way, you’re likely familiar with the reasons why learning to code is a worthwhile commitment and use of your time. But, you may also be wondering: Are there certain programming languages I should learn this year?

Here are the top 5 programming languages the Treehouse team recommends for 2018, alongside the most compelling reasons why you should learn them.

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1. JavaScript

JavaScript is an essential programming language to learn because it’s everywhere and in everything. What’s particularly great about JavaScript is that it works on both the client and server side so you can build offline apps, desktop apps, native apps, and even run it on IoT (Internet of Things) devices. It’s the universal programming language of the web and will continue to be, so if you’re unsure what to learn this year, you can’t go wrong with learning JavaScript.

Start learning JavaScript with one of our most popular courses,JavaScript Basics

BONUS TIP: If you already know JavaScript, check out TypeScript next, which is an enhanced version of JavsScript that provides static typing, classes, and interfaces. Check out the Getting Started with TypeScript course.

2. Python

Python has always been a popular programming language to learn as it’s incredibly beginner friendly. It isn’t verbose, and you’ll be able to build your coding skills quickly. In fact, we recently asked a selection of expert developers to share which programming language they recommended for a complete beginner and Python came out on top. It’s also a great language to learn due to the ever-growing demand for it in the job market. Whatsmore, Python will be even more relevant to learn this year as it’s also the most popular language for machine learning, which is becoming increasingly important. If you want to learn more about Python and what you can do with it, check out this great post by Kenneth Love.

Start learning Python with thePython Basics course

3. C#

Even though it was first released in 2000, C# has evolved at a steady pace and is still considered one of the most modern and popular programming languages used today. It’s easy to code and used in all types of software development. From writing web applications that run on most web servers, to mobile applications that run on practically any mobile device, and even in 3D games. In fact, C# will be a particularly valuable to learn this year as it’s used in Unity, which is the game engine that powers AR (Augmented Reality) and VR (Virtual Reality) experiences.

Another bonus to learning C# is that it can help prepare you to learn other languages. For example, C# and Java not only have similar syntax, they also share conceptual, architectural, and runtime similarities. So once you’ve grasped the fundamentals of C#, you ‘ll find yourself able to apply your understanding to other languages as well.

Start learning C# with the introductoryC# Basics course

4. Go

The Go programming language is simple, powerful, and rapidly rising in popularity. The story of Go started with a team at Google writing a “wishlist” of goals they’d like to see in their ideal programming language. They wanted it to compile fast, the resulting programs to execute fast, to make it easy to write programs that support concurrency, and it to support garbage collection (the automatic freeing of unused memory, so they didn’t have to explicitly free memory in their code). The outcome was Go, and once you’ve started programming with it this year, you’ll see for yourself how well it meets all of their expectations. (We would recommend that you start learning Go once you’re comfortable with another language as you’ll find it easier to pick up if you’ve got some basic programming foundations.)

Start learning Go with theGo Language Overview course

5. Android with Kotlin

Compared to the other languages we’ve mentioned, Kotlin is relatively recent and only appeared back in 2011 as an open source project by JetBrains. Since then, Kotlin has grown to become a drop-in replacement for Java, giving Java developers the opportunity to upgrade to a more expressive language. JetBrains focused on efficiency when creating their new language, and you’ll experience the benefits of that early on when coding in Kotlin. In 2017, Google announced Kotlin was officially a supported language on the Android platform – which created a surge in popularity – and they’re working hard to get it on more platforms, making now the perfect time to invest in learning this rapidly growing language. To read more about Kotlin, check out the absolute beginner’s guide to Kotlin.

Learn how tobuild a simple Android App with Kotlin

*Aside from these top 5, there are so many other programming languages to learn, depending on what you’re interested in and what you want to build with your code. *

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JavaScript developers should you be using Web Workers?

JavaScript developers should you be using Web Workers?

Do you think JavaScript developers should be making more use of Web Workers to shift execution off of the main thread?

Originally published by David Gilbertson at https://medium.com

So, Web Workers. Those wonderful little critters that allow us to execute JavaScript off the main thread.

Also known as “no, you’re thinking of Service Workers”.

Photo by Caleb Jones on Unsplash

Before I get into the meat of the article, please sit for a lesson in how computers work:

Understood? Good.

For the red/green colourblind, let me explain. While a CPU is doing one thing, it can’t be doing another thing, which means you can’t sort a big array while a user scrolls the screen.

This is bad, if you have a big array and users with fingers.

Enter, Web Workers. These split open the atomic concept of a ‘CPU’ and allow us to think in terms of threads. We can use one thread to handle user-facing work like touch events and rendering the UI, and different threads to carry out all other work.

Check that out, the main thread is green the whole way through, ready to receive and respond to the gentle caress of a user.

You’re excited (I can tell), if we only have UI code on the main thread and all other code can go in a worker, things are going to be amazing (said the way Oprah would say it).

But cool your jets for just a moment, because websites are mostly about the UI — it’s why we have screens. And a lot of a user’s interactions with your site will be tapping on the screen, waiting for a response, reading, tapping, looking, reading, and so on.

So we can’t just say “here’s some JS that takes 20ms to run, chuck it on a thread”, we must think about where that execution time exists in the user’s world of tap, read, look, read, tap…

I like to boil this down to one specific question:

Is the user waiting anyway?

Imagine we have created some sort of git-repository-hosting website that shows all sorts of things about a repository. We have a cool feature called ‘issues’. A user can even click an ‘issues’ tab in our website to see a list of all issues relating to the repository. Groundbreaking!

When our users click this issues tab, the site is going to fetch the issue data, process it in some way — perhaps sort, or format dates, or work out which icon to show — then render the UI.

Inside the user’s computer, that’ll look exactly like this.

Look at that processing stage, locking up the main thread even though it has nothing to do with the UI! That’s terrible, in theory.

But think about what the human is actually doing at this point. They’re waiting for the common trio of network/process/render; just sittin’ around with less to do than the Bolivian Navy.

Because we care about our users, we show a loading indicator to let them know we’ve received their request and are working on it — putting the human in a ‘waiting’ state. Let’s add that to the diagram.

Now that we have a human in the picture, we can mix in a Web Worker and think about the impact it will have on their life:

Hmmm.

First thing to note is that we’re not doing anything in parallel. We need the data from the network before we process it, and we need to process the data before we can render the UI. The elapsed time doesn’t change.

(BTW, the time involved in moving data to a Web Worker and back is negligible: 1ms per 100 KB is a decent rule of thumb.)

So we can move work off the main thread and have a page that is responsive during that time, but to what end? If our user is sitting there looking at a spinner for 600ms, have we enriched their experience by having a responsive screen for the middle third?

No.

I’ve fudged these diagrams a little bit to make them the gorgeous specimens of graphic design that they are, but they’re not really to scale.

When responding to a user request, you’ll find that the network and DOM-manipulating part of any given task take much, much longer than the pure-JS data processing part.

I saw an article recently making the case that updating a Redux store was a good candidate for Web Workers because it’s not UI work (and non-UI work doesn’t belong on the main thread).

Chucking the data processing over to a worker thread sounds sensible, but the idea struck me as a little, umm, academic.

First, let’s split instances of ‘updating a store’ into two categories:

  1. Updating a store in response to a user interaction, then updating the UI in response to the data change
  2. Not that first one

If the first scenario, a user taps a button on the screen — perhaps to change the sort order of a list. The store updates, and this results in a re-rendering of the DOM (since that’s the point of a store).

Let me just delete one thing from the previous diagram:

In my experience, it is rare that the store-updating step goes beyond a few dozen milliseconds, and is generally followed by ten times that in DOM updating, layout, and paint. If I’ve got a site that’s taking longer than this, I’d be asking questions about why I have so much data in the browser and so much DOM, rather than on which thread I should do my processing.

So the question we’re faced with is the same one from above: the user tapped something on the screen, we’re going to work on that request for hopefully less than a second, why would we want to make the screen responsive during that time?

OK what about the second scenario, where a store update isn’t in response to a user interaction? Performing an auto-save, for example — there’s nothing more annoying than an app becoming unresponsive doing something you didn’t ask it to do.

Actually there’s heaps of things more annoying than that. Teens, for example.

Anyhoo, if you’re doing an auto-save and taking 100ms to process data client-side before sending it off to a server, then you should absolutely use a Web Worker.

In fact, any ‘background’ task that the user hasn’t asked for, or isn’t waiting for, is a good candidate for moving to a Web Worker.

The matter of value

Complexity is expensive, and implementing Web Workers ain’t cheap.

If you’re using a bundler — and you are — you’ll have a lot of reading to do, and probably npm packages to install. If you’ve got a create-react-app app, prepare to eject (and put aside two days twice a year to update 30 different packages when the next version of Babel/Redux/React/ESLint comes out).

Also, if you want to share anything fancier than plain data between a worker and the main thread you’ve got some more reading to do (comlink is your friend).

What I’m getting at is this: if the benefit is real, but minimal, then you’ve gotta ask if there’s something else you could spend a day or two on with a greater benefit to your users.

This thinking is true of everything, of course, but I’ve found that Web Workers have a particularly poor benefit-to-effort ratio.

Hey David, why you hate Web Workers so bad?

Good question.

This is a doweling jig:

I own a doweling jig. I love my doweling jig. If I need to drill a hole into the end of a piece of wood and ensure that it’s perfectly perpendicular to the surface, I use my doweling jig.

But I don’t use it to eat breakfast. For that I use a spoon.

Four years ago I was working on some fancy animations. They looked slick on a fast device, but janky on a slow one. So I wrote fireball-js, which executes a rudimentary performance benchmark on the user’s device and returns a score, allowing me to run my animations only on devices that would render them smoothly.

Where’s the best spot to run some CPU intensive code that the user didn’t request? On a different thread, of course. A Web Worker was the correct tool for the job.

Fast forward to 2019 and you’ll find me writing a routing algorithm for a mapping application. This requires parsing a big fat GeoJSON map into a collection of nodes and edges, to be used when a user asks for directions. The processing isn’t in response to a user request and the user isn’t waiting on it. And so, a Web Worker is the correct tool for the job.

It was only when doing this that it dawned on me: in the intervening quartet of years, I have seen exactly zero other instances where Web Workers would have improved the user experience.

Contrast this with a recent resurgence in Web Worker wonderment, and combine that contrast with the fact that I couldn’t think of anything else to write about, then concatenate that combined contrast with my contrarian character and you’ve got yourself a blog post telling you that maybe Web Workers are a teeny-tiny bit overhyped.

Thanks for reading

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Further reading

An Introduction to Web Workers

JavaScript Web Workers: A Beginner’s Guide

Using Web Workers to Real-time Processing

How to use Web Workers in Angular app

Using Web Workers with Angular CLI