Post pobrano z: Animating Number Counters

Number animation, as in, imagine a number changing from 1 to 2, then 2 to 3, then 3 to 4, etc. over a specified time. Like a counter, except controlled by the same kind of animation that we use for other design animation on the web. This could be useful when designing something like a dashboard, to bring a little pizazz to the numbers. Amazingly, this can now be done in CSS without much trickery. You can jump right to the new solution if you like, but first let’s look at how we used to do it.

One fairly logical way to do number animation is by changing the number in JavaScript. We could do a rather simple setInterval, but here’s a fancier answer with a function that accepts a start, end, and duration, so you can treat it more like an animation:

Keeping it to CSS, we could use CSS counters to animate a number by adjusting the count at different keyframes:

Another way would be to line up all the numbers in a row and animate the position of them only showing one at a time:

Some of the repetitive code in these examples could use a preprocessor like Pug for HTML or SCSS for CSS that offer loops to make them perhaps easier to manage, but use vanilla on purpose so you can see the fundamental ideas.

The New School CSS Solution

With recent support for CSS.registerProperty and @property, we can animate CSS variables. The trick is to declare the CSS custom property as an integer; that way it can be interpolated (like within a transition) just like any other integer.

@property --num {
  syntax: '<integer>';
  initial-value: 0;
  inherits: false;
}

div {
  transition: --num 1s;
  counter-reset: num var(--num);
}
div:hover {
  --num: 10000;
}
div::after {
  content: counter(num);
}

Important Note: At the time of this writing, this @property syntax is only supported in Chrome ( and other Chromium core browsers like Edge and Opera), so this isn’t cross-browser friendly. If you’re building something Chrome-only (e.g. an Electron app) it’s useful right away, if not, wait. The demos from above are more widely supported.

The CSS content property can be used to display the number, but we still need to use counter to convert the number to a string because content can only output <string> values.

See how we can ease the animations just like any other animation? Super cool! 

Typed CSS variables can also be used in @keyframes: 

One downside? Counters only support integers. That means decimals and fractions are out of the question. We’d have to display the integer part and fractional part separately somehow.

Can we animate decimals?

It’s possible to convert a decimal (e.g. --number) to an integer. Here’s how it works:

1. Register an <integer> CSS variable ( e.g. --integer ), with the initial-value specified
2. Then use calc() to round the value: --integer: calc(var(--number))

In this case, --number will be rounded to the nearest integer and store the result into --integer.

@property --integer {
  syntax: "<integer>";
  initial-value: 0;
  inherits: false;
}
--number: 1234.5678;
--integer: calc(var(--number)); /* 1235 */

Sometimes we just need the integer part. There is a tricky way to do it: --integer: max(var(--number) - 0.5, 0). This works for positive numbers. calc() isn’t even required this way.

/* @property --integer */
--number: 1234.5678;
--integer: max(var(--number) - 0.5, 0); /* 1234 */

We can extract the fractional part in a similar way, then convert it into string with counter (but remember that content values must be strings). To display concatenated strings, use following syntax:

content: "string1" var(--string2) counter(--integer) ...

Here’s a full example that animates percentages with decimals:

Other tips

Because we’re using CSS counters, the format of those counters can be in other formats besides numbers. Here’s an example of animating the letters “CSS” to “YES”!

Oh and here’s another tip: we can debug the values grabbing the computed value of the custom property with JavaScript:

getComputedStyle(element).getPropertyValue('--variable')

That’s it! It’s amazing what CSS can do these days.

---

The post Animating Number Counters appeared first on CSS-Tricks.

You can support CSS-Tricks by being an MVP Supporter.

Post pobrano z: Animating Number Counters

Number animation, as in, imagine a number changing from 1 to 2, then 2 to 3, then 3 to 4, etc. over a specified time. Like a counter, except controlled by the same kind of animation that we use for other design animation on the web. This could be useful when designing something like a dashboard, to bring a little pizazz to the numbers. Amazingly, this can now be done in CSS without much trickery. You can jump right to the new solution if you like, but first let’s look at how we used to do it.

One fairly logical way to do number animation is by changing the number in JavaScript. We could do a rather simple setInterval, but here’s a fancier answer with a function that accepts a start, end, and duration, so you can treat it more like an animation:

Keeping it to CSS, we could use CSS counters to animate a number by adjusting the count at different keyframes:

Another way would be to line up all the numbers in a row and animate the position of them only showing one at a time:

Some of the repetitive code in these examples could use a preprocessor like Pug for HTML or SCSS for CSS that offer loops to make them perhaps easier to manage, but use vanilla on purpose so you can see the fundamental ideas.

The New School CSS Solution

With recent support for CSS.registerProperty and @property, we can animate CSS variables. The trick is to declare the CSS custom property as an integer; that way it can be interpolated (like within a transition) just like any other integer.

@property --num {
  syntax: '<integer>';
  initial-value: 0;
  inherits: false;
}

div {
  transition: --num 1s;
  counter-reset: num var(--num);
}
div:hover {
  --num: 10000;
}
div::after {
  content: counter(num);
}

Important Note: At the time of this writing, this @property syntax is only supported in Chrome ( and other Chromium core browsers like Edge and Opera), so this isn’t cross-browser friendly. If you’re building something Chrome-only (e.g. an Electron app) it’s useful right away, if not, wait. The demos from above are more widely supported.

The CSS content property can be used to display the number, but we still need to use counter to convert the number to a string because content can only output <string> values.

See how we can ease the animations just like any other animation? Super cool! 

Typed CSS variables can also be used in @keyframes: 

One downside? Counters only support integers. That means decimals and fractions are out of the question. We’d have to display the integer part and fractional part separately somehow.

Can we animate decimals?

It’s possible to convert a decimal (e.g. --number) to an integer. Here’s how it works:

1. Register an <integer> CSS variable ( e.g. --integer ), with the initial-value specified
2. Then use calc() to round the value: --integer: calc(var(--number))

In this case, --number will be rounded to the nearest integer and store the result into --integer.

@property --integer {
  syntax: "<integer>";
  initial-value: 0;
  inherits: false;
}
--number: 1234.5678;
--integer: calc(var(--number)); /* 1235 */

Sometimes we just need the integer part. There is a tricky way to do it: --integer: max(var(--number) - 0.5, 0). This works for positive numbers. calc() isn’t even required this way.

/* @property --integer */
--number: 1234.5678;
--integer: max(var(--number) - 0.5, 0); /* 1234 */

We can extract the fractional part in a similar way, then convert it into string with counter (but remember that content values must be strings). To display concatenated strings, use following syntax:

content: "string1" var(--string2) counter(--integer) ...

Here’s a full example that animates percentages with decimals:

Other tips

Because we’re using CSS counters, the format of those counters can be in other formats besides numbers. Here’s an example of animating the letters “CSS” to “YES”!

Oh and here’s another tip: we can debug the values grabbing the computed value of the custom property with JavaScript:

getComputedStyle(element).getPropertyValue('--variable')

That’s it! It’s amazing what CSS can do these days.

---

The post Animating Number Counters appeared first on CSS-Tricks.

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Post pobrano z: Balancing on a Pivot with Flexbox

Let me show you a way I recently discovered to center a bunch of elements around what I call the pivot. I promise you that funky HTML is out of the question and you won’t need to know any bleeding-edge CSS to get the job done.

I’m big on word games, so I recently re-imagined the main menu of my website as a nod to crossword puzzles, with my name as the vertical word, and the main sections of my website across the horizontals.

Here’s how the design looks with the names of some colors instead:

And here’s a sample of the HTML that drives this puzzle:

<div class="puzzle">
  <div class="word">
    <span class="letter">i</span>
    <span class="letter">n</span>
    <span class="letter">d</span>
    <span class="letter">i</span>
    <span class="letter pivot">g</span>
    <span class="letter">o</span>
  </div>
  <!-- MORE WORDS -->
</div>

In this example, the letter g is the pivot. See how it’s not at the halfway mark? That’s the beauty of this challenge.

We could apply an offset to each word using hard-coded CSS or inline custom properties and walk away. It certainly gets an award for being the most obvious way to solve the problem, but there’s a downside — in addition to the .pivot class, we’d have to specify an offset for every word. The voice in my head tells me that’s adding unnecessary redundancy, is less flexible, and requires extra baggage we don’t need every time we add or change a word.

Let’s take a step back instead and see how the puzzle looks without any balancing:

Imagine for a moment that we use display: none to hide all of the letters before the pivot; now all we can see are the pivots and everything after them:

With no further changes, our pivots would already be aligned. But we’ve lost the start of our words, and when we reintroduce the hidden parts, each word gets pushed out to the right and everything is out of whack again.

If we were to hide the trailing letters instead, we’d still be left with misaligned pivots:

All of this back-and-forth seems a bit pointless, but it reveals a symmetry to my problem. If we were to use a right-to-left (RTL) reading scheme, we’d have the opposite problem — we’d be able to solve the right side but the left would be all wrong.

Wouldn’t it be great if there was a way to have both sides line up at the same time?

As a matter of fact, there is.

Given we already have half a solution, let’s borrow a concept from algorithmics called divide and conquer. The general idea is that we can break a problem down into parts, and that by finding a solution for the parts, we’ll find a solution for the whole.

In that case, let’s break our problem down into the positioning of two parts. First is the “head” or everything before the pivot.

Next is the “tail” which is the pivot plus everything after it.

The flex display type will help us here; if you’re not familiar with it, flex is a framework for positioning elements in one-dimension. The trick here is to take advantage of the left and right ends of our container to enforce alignment. To make it work, we’ll swap the head and tail parts by using a smaller order  property value on the tail than the head. The order property is used by flex to determine the sequence of elements in a flexible layout. Smaller numbers are placed earlier in the flow.

To distinguish the head and tail elements without any extra HTML, we can apply styles to the head part to all of the letters, after which we’ll make use of the cascading nature of CSS to override the pivot and everything after it using the subsequent-sibling selector .pivot ~ .letter.

Here’s how things look now:

Okay, so now the head is sitting flush up against the end of the tail. Hang on, don’t go kicking up a stink about it! We can fix this by applying margin: auto to the right of the last element in the tail. That just so happens to also be the last letter in the word which is now sitting somewhere in the middle. The addition of an auto margin serves to push the head away from the tail and all the way over to the right-hand side of our container.

Now we have something that looks like this:

The only thing left is stitch our pieces back together in the right order. This is easy enough to do if we apply position: relative to all of our letters and then chuck a left: 50% on the tail and a right: 50% on our head items.

Here’s a generalized version of the code we just used. As you can see, it’s just 15 lines of simple CSS:

.container {
  display: flex;
}
.item:last-child {
  margin-right: auto;
}
.item {
  order: 2;
  position: relative;
  right: 50%;
}
.pivot, .pivot ~ .item {
  order: 1;
  left: 50%;
}

It’s also feasible to use this approach for vertical layouts by setting the flex-direction to a column value. It should also be said that the same can be achieved by sticking the head and tail elements in their own wrappers — but that would require more markup and verbose CSS while being a lot less flexible. What if, for example, our back-end is already generating an unwrapped list of elements with dynamically generated classes?

Quite serendipitously, this solution also plays well with screen readers. Although we’re ordering the two sections backwards, we’re then shifting them back into place via relative positioning, so the final ordering of elements matches our markup, albeit nicely centered.

Here’s the final example on CodePen:

Conclusion

Developers are better at balancing than acrobats. Don’t believe me? Think about it: many of the common challenges we face require finding a sweet spot between competing requirements ranging from performance and readability, to style and function, and even scalability and simplicity. A balancing act, no doubt.

But the point at which we find balance isn’t always midway between one thing and another. Balance is often found at some inexplicable point in between; or, as we’ve just seen, around an arbitrary HTML element.

So there you have it! Go and tell your friends that you’re the greatest acrobat around.

---

The post Balancing on a Pivot with Flexbox appeared first on CSS-Tricks.

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Post pobrano z: The Widening Responsibility for Front-End Developers

This is an extended version of my essay “When front-end means full-stack” which was published in the wonderful Increment magazine put out by Stripe. It’s also something of an evolution of a couple other of my essays, “The Great Divide” and “Ooops, I guess we’re full-stack developers now.”

Looking back at the courses I chose from middle school through college, I bounced back and forth between computer-focused classes and art-focused classes, so I suppose it’s no surprise I found a way to do both as a career.

The term “Front-End Developer” is fairly well-defined and understood. For one, it’s a job title. I’ll bet some of you literally have business cards that say it on there, or some variation like: “Front-End Designer,” “UX Developer,” or “UI Engineer.” The debate around what those mean isn’t particularly interesting to me. I find that the roles are so varied from job-to-job and company-to-company that job titles will never be enough to describe things. Getting this job is more about demonstrating you know what you’re doing more than anything else¹.

The title variations are just nuance. The bigger picture is that as long as the job is building websites, front-enders are focused on the browser. Quite literally:

• front-end = browsers
• back-end = servers

Even as the job has changed over the decades, that distinction still largely holds.

As “browser people,” there are certain truths that come along for the ride. One is that there is a whole landscape of different browsers and, despite the best efforts of standards bodies, they still behave somewhat differently. Just today, as I write, I dealt with a bug where a date string I had from an API was in a format such that Firefox threw an error when I tried to use the .toISOString() JavaScript API on it, but was fine in Chrome. That’s just life as a front-end developer. That’s the job.

The most important aspect of the job? The people that use these browsers. That’s why we’re building things at all. These are the people I’m trying to impress with my mad CSS skills. These are the people I’m trying to get to buy my widget. Who all my business charts hinge upon. Who’s reaction can sway my emotions like yarn in the breeze. These users, who we put on a pedestal for good reason, have a much wider landscape than the browsers do. They speak different languages. They want different things. They are trying to solve different problems. They have different physical abilities. They have different levels of urgency. Again, helping them is firmly in the hands of front-end developers. There is very little in between the characters we type into our text editors and the users for whom we wish to serve.

Being a front-end developer puts us on the front lines between the thing we’re building and the people we’re building it for, and that’s a place some of us really enjoy being.

That’s some weighty stuff, isn’t it? I haven’t even mentioned React yet.

The “we care about the users” thing might feel a little precious. I’d think in a high functioning company, everyone would care about the users, from the CEO on down. It’s different, though. When we code a <button>, we’re quite literally putting a button into a browser window that users directly interact with. When we adjust a color, we’re adjusting exactly what our sighted users see when they see our work.

---

We established that front-end developers are browser people. The job is making things work well in browsers. So we need to understand the languages browsers speak, namely: HTML, CSS, and JavaScript². And that’s not just me being some old school fundamentalist; it’s through a few decades of everyday front-end development work that knowing those base languages is vital to us doing a good job. Even when we don’t work directly with them (HTML might come from a template in another language, CSS might be produced from a preprocessor, JavaScript might be mostly written in the parlance of a framework), what goes the browser is ultimately HTML, CSS, and JavaScript, so that’s where debugging largely takes place and the ability of the browser is put to work.

CSS will always be my favorite and HTML feels like it needs the most love — but JavaScript is the one we really need to examine The last decade has seen JavaScript blossom from a language used for a handful of interactive effects to the predominant language used across the entire stack of web design and development. It’s possible to work on websites and writing nothing but JavaScript. A real sea change.

JavaScript is all-powerful in the browser. In a sense, it supersedes HTML and CSS, as there is nothing either of those languages can do that JavaScript cannot. HTML is parsed by the browser and turned into the DOM, which JavaScript can also entirely create and manipulate. CSS has its own model, the CSSOM, that applies styles to elements in the DOM, which JavaScript can also create and manipulate.

This isn’t quite fair though. HTML is the very first file that browsers parse before they do the rest of the work needed to build the site. That firstness is unique to HTML and a vital part of making websites fast.

In fact, if the HTML was the only file to come across the network, that should be enough to deliver the basic information and functionality of a site.

That philosophy is called Progressive Enhancement. I’m a fan, myself, but I don’t always adhere to it perfectly. For example, a <form> can be entirely functional in HTML, when it’s action attribute points to a URL where the form can be processed. Progressive Enhancement would have us build it that way. Then, when JavaScript executes, it takes over the submission and has the form submit via Ajax instead, which might be a nicer experience as the page won’t have to refresh. I like that. Taken further, any <button> outside a form is entirely useless without JavaScript, so in the spirit of Progressive Enhancement, I should wait until JavaScript executes to even put that button on the page at all (or at least reveal it). That’s the kind of thing where even those of us with the best intentions might not always toe the line perfectly. Just put the button in, Sam. Nobody is gonna die.

JavaScript’s all-powerfulness makes it an appealing target for those of us doing work on the web — particularly as JavaScript as a language has evolved to become even more powerful and ergonomic, and the frameworks that are built in JavaScript become even more-so. Back in 2015, it was already so clear that JavaScript was experiencing incredible growth in usage, Matt Mullenweg, co-founder of WordPress, gave the developer world homework: “Learn JavaScript Deeply”³. He couldn’t have been more right. Half a decade later, JavaScript has done a good job of taking over front-end development. Particularly if you look at front-end development jobs.

While the web almanac might show us that only 5% of the top-zillion sites use React compared to 85% including jQuery, those numbers are nearly flipped when looking around at front-end development job requirements.

I’m sure there are fancy economic reasons for all that, but jobs are as important and personal as it gets for people, so it very much matters.

---

So we’re browser people in a sea of JavaScript building things for people. If we take a look at the job at a practical day-to-day tasks level, it’s a bit like this:

Just that first bullet point feels like a college degree to me. Taken together, all of those points certainly do.

This whole list is a bit abstract though, so let’s apply it to something we can look at. What if this website was our current project?

Our brains and fingers go wild!

I could go on and on. That’s how front-end developers think, at least in my experience and in talking with my peers.

A lot of those things have been our jobs forever though. We’ve been asking and answering these questions on every website we’ve built for as long as we’ve been doing it. There are different challenges on each site, which is great and keeps this job fun, but there is a lot of repetition too.

Allow me to get around to the title of this article. 

I like it, this idea of components. It allows you and your team to build the abstractions that make the most sense to you and what you are building.

Your Card component does all the stuff your card needs to do. Your Form component does forms how your website needs to do forms. But it’s a new concept to old developers like me. Components in JavaScript have taken hold in a way that components on the server-side never did. I’ve worked on many a WordPress website where the best I did was break templates into somewhat arbitrary include() statements. I’ve worked on Ruby on Rails sites with partials that take a handful of local variables. Those are useful for building re-usable parts, but they are a far cry from the robust component models that JavaScript frameworks offer us today.

All this custom component creation makes me a site-level architect in a way that I didn’t use to be. Here’s an example. Of course I have a Button component. Of course I have an Icon component. I’ll use them in my Card component. My Card component lives in a Grid component that lays them out and paginates them. The whole page is actually built from components. The Header component has a SearchBar component and a UserMenu component. The Sidebar component has a Navigation component and an Ad component. The whole page is just a special combination of components, which is probably based on the URL, assuming I’m all-in on building our front-end with JavaScript. So now I’m dealing with URLs myself, and I’m essentially the architect of the entire site. [Sweats profusely]

Like I told ya, a whole pile of new responsibility.

Components that are in charge of displaying content are almost certainly not hard-coded with data in them. They are built to be templates. They are built to accept data and construct themselves based on that data. In the olden days, when we were doing this kind of templating, the data has probably already arrived on the page we’re working on. In a JavaScript-powered app, it’s more likely that that data is fetched by JavaScript. Perhaps I’ll fetch it when the component renders. In a stack I’m working with right now, the front end is in React, the API is in GraphQL and we use Apollo Client to work with data. We use a special “hook” in the React components to run the queries to fetch the data we need, and another special hook when we need to change that data. Guess who does that work? Is it some other kind of developer that specializes in this data layer work? No, it’s become the domain of the front-end developer.

Speaking of data, there is all this other data that a website often has to deal with that doesn’t come from a database or API. It’s data that is really only relevant to the website at this moment in time.

Front-end developers have been dealing with that kind of state for a long time, but it’s exactly this kind of state that has gotten us into trouble before. A modal dialog can be open with a simple modifier class like <div class="modal is-open"> and toggling that class is easy enough with .classList.toggle(".is-open"); But that’s a purely visual treatment. How does anything else on the page know if that modal is open or not? Does it ask the DOM? In a lot of jQuery-style apps of yore, yes, it would. In a sense, the DOM became the “source of truth” for our websites. There were all sorts of problems that stemmed from this architecture, ranging from a simple naming change destroying functionality in weirdly insidious ways, to hard-to-reason-about application logic making bug fixing a difficult proposition.

Front-end developers collectively thought: what if we dealt with state in a more considered way? State management, as a concept, became a thing. JavaScript frameworks themselves built the concept right in, and third-party libraries have paved and continue to pave the way. This is another example of expanding responsibility. Who architects state management? Who enforces it and implements it? It’s not some other role, it’s front-end developers.

There is expanding responsibility in the checklist of things to do, but there is also work to be done in piecing it all together. How much of this state can be handled at the individual component level and how much needs to be higher level? How much of this data can be gotten at the individual component level and how much should be percolated from above? Design itself comes into play. How much of the styling of this component should be scoped to itself, and how much should come from more global styles?

It’s no wonder that design systems have taken off in recent years. We’re building components anyway, so thinking of them systemically is a natural fit.

Let’s look at our design again:

A bunch of new thoughts can begin!

Those are all things that are in the domain of front-end developers these days, on top of everything that we already need to do. Executing the design, semantics, accessibility, performance… that’s all still there. You still need to be proficient in HTML, CSS, JavaScript, and how the browser works. Being a front-end developer requires a haystack of skills that grows and grows. It’s the natural outcome of the web getting bigger. More people use the web and internet access grows. The economy around the web grows. The capability of browsers grows. The expectations of what is possible on the web grows. There isn’t a lot shrinking going on around here.

We’ve already reached the point where most front-end developers don’t know the whole haystack of responsibilities. There are lots of developers still doing well for themselves being rather design-focused and excelling at creative and well-implemented HTML and CSS, even as job posts looking for that dwindle.

There are systems-focused developers and even entire agencies that specialize in helping other companies build and implement design systems. There are data-focused developers that feel most at home making the data flow throughout a website and getting hot and heavy with business logic. While all of those people might have “front-end developer” on their business card, their responsibilities and even expectations of their work might be quite different. It’s all good, we’ll find ways to talk about all this in time.

In fact, how we talk about building websites has changed a lot in the last decade. Some of my early introduction to web development was through WordPress. WordPress needs a web server to run, is written in PHP, and stores it’s data in a MySQL database. As much as WordPress has evolved, all that is still exactly the same. We talk about that “stack” with an acronym: LAMP, or Linux, Apache, MySQL and PHP. Note that literally everything in the entire stack consists of back-end technologies. As a front-end developer, nothing about LAMP is relevant to me.

But other stacks have come along since then. A popular stack was MEAN (Mongo, Express, Angular and Node). Notice how we’re starting to inch our way toward more front-end technologies? Angular is a JavaScript framework, so as this stack gained popularity, so too did talking about the front-end as an important part of the stack. Node and Express are both JavaScript as well, albeit the server-side variant.

The existence of Node is a huge part of this story. Node isn’t JavaScript-like, it’s quite literally JavaScript. It makes a front-end developer already skilled in JavaScript able to do server-side work without too much of a stretch.

“Serverless” is a much more modern tech buzzword, and what it’s largely talking about is running small bits of code on cloud servers. Most often, those small bits of code are in Node, and written by JavaScript developers. These days, a JavaScript-focused front-end developer might be writing their own serverless functions and essentially being their own back-end developer. They’ll think of themselves as full-stack developers, and they’ll be right.

Shawn Wang coined a term for a new stack this year: STAR or Design System, TypeScript, Apollo, and React. This is incredible to me, not just because I kind of like that stack, but because it’s a way of talking about the stack powering a website that is entirely front-end technologies. Quite a shift.

I apologize if I’ve made you feel a little anxious reading this. If you feel like you’re behind in understanding all this stuff, you aren’t alone.

In fact, I don’t think I’ve talked to a single developer who told me they felt entirely comfortable with the entire world of building websites. Everybody has weak spots or entire areas where they just don’t know the first dang thing. You not only can specialize, but specializing is a pretty good idea, and I think you will end up specializing to some degree whether you plan to or not. If you have the good fortune to plan, pick things that you like. You’ll do just fine.

The only constant in life is change.

– Heraclitus
    – Motivational Poster
        – Chris Coyier

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Post pobrano z: Looking at AWS Amplify

AWS Amplify is a collection of tools from AWS to help you build applications.

Allow me to set the stage here to try to make that as clear as I know how. I have a friend (true story) who wants to build an app centered around physical training. His wife is a physical trainer, and they think perhaps there is some money to be made. It’s not entirely specced out, but perhaps the app sells access to personalized training programs, offers customized diets, exercise videos, and does the scheduling for one-on-one consultations. Sounds smart to me! Assuming they prove out the idea to some degree, it’s time to put their development skills to work and get to building.

A lot of the needs of an app like this map directly and easily to Amplify. A developer starting to plan might think like this:

• We need to host this somewhere… Amplify has Static Web Hosting. And it’s fully featured with the fancy DX we’re starting to except these days: I connect a Git repo, and it will not only do deployment to CDN-backed global static hosting based on commits, but it will run my CI/CD (e.g. run tests) and give me URLs for previewing feature branches. You do all this with the AWS Amplify Console.
• We need to do user authentication... The whole point here is that users can log in to get access to their stuff. Amplify helps with this (it’s Amazon Cognito built-in), which allows for typical sign-up/sign-in/forgot-password stuff, but also all the social login stuff you would expect. This is an example of what Amplify does: it helps abstract and build out underlying cloud services with minimal code.
• We need data storage… Ideally, it’s managed with GraphQL because my modern front-end really benefits from that (perhaps it’s a React app). Amplify has that. It’s AWS AppSync built-in, which means you can use any type of data store, but get amazing features on top, like the GraphQL endpoints, realtime data syncing, and offline support.

That’s just the basics. All of that is extremely well-covered.

How do we set all this stuff up? This is one of the best parts: there is a CLI to help do everything. For example, about that data storage stuff, how do we get going with that? Once the CLI is installed and we’ve run amplify init in the project, we do amplify add api and we’ll be walked through it.

Now for this physical training app, we’ll need some static file storage as well. Maybe all the users have custom avatars, and the videos themselves need protected hosting. Well, we’re in AWS land here, so S3 buckets are a perfect fit. How? amplify add storage and we’ll be walked through it and of course, there are docs.

Impressive, really. We can build almost this entire thing with Amplify.

The one time we might have to reach out to another service is to handle payments. Stripe is usually the first choice of developers because of their great DX and robust APIs. They are built exactly for apps like this. We’d do our communicating with Stripe APIs over serverless functions. And guess what? We’re in AWS land here, so we have access to Lambdas, the best serverless function provider there is. The trick is that we can have our GraphQL setup, via AppSync, call a Lambda which can communicate with any outside API. Fortunately, there is a detailed walkthrough here from Ramon Postulart.

The guide to add Payments to your React Native App with Stripe, Expo and AWS Amplify by @ramonpostulart https://t.co/CvKl72kzw4 pic.twitter.com/T1MxsK51WC

— AWS Amplify (@AWSAmplify) May 22, 2020

And here’s another approach from Beez Fedia.

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So here’s what I think is important to know:

• Amplify is a helper. AWS offers tons of cloud services. Amplify helps you tie them together and get started using the important ones that you need.
• The static hosting is the foundation for a web project. This is a Jamstack approach. But even that isn’t required, you can, for example, build an iOS app with the tools.
• AWS is the biggest cloud provider in the world and powers many of the world’s biggest websites. You can build a personal project here and typically do it under the free tier, but you’ll never need to worry about scaling. You’re at the right place for scaling.
• There is a lot to explore. If you wake up one day and want to add push notifications or explore something like machine learning, that stuff is there too.

If you’ve read this far, I think this quick high-level video will land better:

Other Resources

• The main resource page
• Nadar Dabit writes a ton about Amplify:
  • Egghead: Building AWS AppSync APIs using the AWS Amplify CLI
  • Here on CSS-Tricks: Getting into GraphQL with AWS AppSync
  • AWS Startups Blog: Building your App from Idea to MVP
  • DEV: Full Stack Serverless – Building a Real-time Chat App with GraphQL, CDK, AppSync, and React
• Shawn Wang:
  • Dave and I chatted with him recently on ShopTalk
  • First Look at AWS Amplify Flutter (Developer Preview)
  • Typesafe, Fullstack React & GraphQL with AWS Amplify

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