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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta
name="viewport"
content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no"
/>
<title>reveal.js</title>
<link rel="stylesheet" href="dist/reset.css" />
<link rel="stylesheet" href="dist/reveal.css" />
<link rel="stylesheet" href="dist/theme/black.css" />
<!-- Theme used for syntax highlighted code -->
<link rel="stylesheet" href="plugin/highlight/monokai.css" />
</head>
<body>
<div class="reveal">
<div class="slides">
<section>
<h1>Blockchain designed front-end</h1>
</section>
<section>
<h2>*transition graph web1 - web2 - web3*</h2>
</section>
<section>
<img src="https://jsdzem.pl/wp-content/uploads/2022/09/what-do-i-do.jpeg" />
</section>
<section>*sketch of front-end UI*</section>
<section>
<!-- How did I get into web3? -->
<video data-autoplay src="https://jsdzem.pl/wp-content/uploads/2022/09/how-did-i-get-to-wb3.mp4"></video>
</section>
<section>
<h2>Disclaimer</h2>
<ul>
<li>My stack ≠ is not the only right stack</li>
<li>No smart contract coding, no Solidity language</li>
<li>EVM compatible chains</li>
</ul>
</section>
<section>
<h2>Why blockchain?</h2>
<ul>
<li>Provides ownership out of the box</li>
<li>Ready to use platform</li>
<li>Open Source</li>
</ul>
</section>
<section>
<div class="r-stack">
<img src="https://jsdzem.pl/wp-content/uploads/2022/09/connect-wallet-button-not-highlighted.png" />
<img class="fragment" src="https://jsdzem.pl/wp-content/uploads/2022/09/connect-wallet-button.png" />
</div>
</section>
<section>
<p>web2 ➡️ backend</p>
<p>web3 ➡️ blockchain</p>
</section>
<section>
<h2><span>a</span> node</h2>
<h3>❌ node.js</h3>
</section>
<section>
<h3>Node providers</h3>
<div style="display: flex">
<div>
<a href="https://infura.io/" target="_blank">Infura</a>
<img
data-src="https://jsdzem.pl/wp-content/uploads/2022/06/infura.png"
alt="Infura"
/>
</div>
<div>
<a href="https://www.alchemy.com/" target="_blank">Alchemy</a>
<img
data-src="https://jsdzem.pl/wp-content/uploads/2022/06/alchemy.png"
alt="Alchemy"
/>
</div>
</div>
</section>
<section>
<ul>
<li>✅ read</li>
<li class="fragment">✅ write 👛</li>
<li class="fragment">❌ update</li>
<li class="fragment">❌ delete</li>
</ul>
</section>
<section>
<table>
<tr>
<td>web2</td>
<td>web3</td>
</tr>
<tr>
<td>
<div class="r-stack">
<div>😥</div>
<div class="fragment">🥹</div>
<div class="fragment">😄</div>
</div>
</td>
<td>😎</td>
</tr>
<tr>
<td colspan="2" class="fragment" style="text-align: center">
🤝
</td>
</tr>
</table>
</section>
<section>
<p>0x5981ac4718e35aE03F5533290eD204a767148450</p>
</section>
<section>
<h2 style="display: flex; justify-content: center">
A
<span class="r-stack">
<span class="fragment fade-out" data-fragment-index="1">P</span>
<span class="fragment" data-fragment-index="1">B</span>
</span>
I
</h2>
<div class="r-stack">
<p
style="display: flex; justify-content: center"
class="fragment fade-out"
data-fragment-index="2"
>
<span class="fragment fade-out" data-fragment-index="2"
>application </span
>
<span class="r-stack">
<span class="fragment fade-out" data-fragment-index="1"
>programming</span
>
<span class="fragment" data-fragment-index="1">binary</span>
<span class="fragment" data-fragment-index="2">schema</span>
</span>
<span class="fragment fade-out" data-fragment-index="2"
> interface</span
>
</p>
<p class="fragment" data-fragment-index="2">schema</p>
</div>
</section>
<section>
<div style="max-height: 65vh; overflow: scroll">
<script src="https://gist.github.com/veox/8800debbf56e24718f9f483e1e40c35c.js"></script>
</div>
</section>
<section>
<img src="https://jsdzem.pl/wp-content/uploads/2022/09/web3-js.png" />
<img class="fragment" src="https://jsdzem.pl/wp-content/uploads/2022/09/ethers-js.png" />
</section>
<section>
<pre><code data-trim data-line-numbers="1|2|3|4|5">
const provider = new ethers.providers.Web3Provider(window.ethereum);
await provider.send("eth_requestAccounts", []);
const signer = provider.getSigner();
const contract = new ethers.Contract(address, abi, provider);
await contract.name()
</code></pre>
</section>
<section>
<h2>Reading from blockchain</h2>
<ul>
<li>reading stands for getting something</li>
<li>free 🆓 you don't pay ETH for gas</li>
<li>no wallet required, shared node is enough</li>
<li>
<code>() ⇒ Promise<Result></code>
</li>
<li>no event emitted</li>
</ul>
</section>
<section>
<h2>Writing to blockchain</h2>
<ul>
<li>writing stands for setting something</li>
<li>cost you to pay for gas</li>
<li>connected wallet required</li>
<li>
<code>
() ⇒ Promise<{ wait: () ⇒ Promise<Receipt> }>
</code>
</li>
<li>can emit events</li>
</ul>
</section>
<section>
<h2>MetaMask</h2>
<p>*browser plugin screenshot*</p>
</section>
<section>
<div style="display: flex; justify-content: space-between">
<p>wallet ==</p>
<div style="text-align: right">
<p class="fragment">identity</p>
<p class="fragment">account</p>
<p class="fragment">owner of tokens</p>
<p class="fragment">values</p>
</div>
</div>
</section>
<section>
<h2>Challenges for front-end devs</h2>
</section>
<section>
<p>*some weird calculations in JavaScript 😅*</p>
</section>
<section>
<p>*cals code and result - side by side*</p>
</section>
<section>
<p>*issue with primitive obsession - code*</p>
</section>
<section>
<h2>Real time UI</h2>
</section>
<section>
<h2>The old way</h2>
<ul>
<li class="fragment">refresh data in relevant interval</li>
<li class="fragment">
update when transaction transaction affected your data
</li>
<li class="fragment">filter redundant calls</li>
<li class="fragment">manage priority</li>
</ul>
</section>
<section>
<div>
<div>
<span>📦</span>
<span class="fragment">📦</span>
<span class="fragment">📦</span>
<span class="fragment">📦</span>
<span class="fragment">📦</span>
</div>
<div>
<span>🕛</span>
</div>
</div>
</section>
<section>
<table>
<tr>
<td>UI</td>
<td>data</td>
<td>events</td>
</tr>
<tr>
<td>React</td>
<td>Redux</td>
<td>RxJS</td>
</tr>
<tr>
<td colspan="3" style="text-align: center">useDapp</td>
</tr>
</table>
</section>
<section>
<p>
<span>Multicall</span>
<span class="fragment">+ block change detecting</span>
<span class="fragment">= real time UI</span>
</p>
</section>
<section>
Testing
<p>What do we want to test?</p>
</section>
<section>
<div class="r-stack">
<img
data-fragment-index="0"
class="fragment fade-in-then-semi-out"
src="https://jsdzem.pl/wp-content/uploads/2022/09/test-testpyramid.png"
alt="test pyramid"
/>
<div class="fragment fade-out" data-fragment-index="4">
<br />
<p class="fragment" data-fragment-index="3">E2E</p>
<br />
<p class="fragment" data-fragment-index="2">integration</p>
<br />
<p class="fragment" data-fragment-index="1">unit</p>
</div>
<div class="fragment" data-fragment-index="4">
<br />
<p
class="fragment"
data-fragment-index="12"
style="margin-bottom: 6%"
>
<span
class="fragment fade-out"
data-fragment-index="14"
>
Run in real browser
<span class="fragment" data-fragment-index="13">
with real wallet
</span>
</span>
</p>
<p class="fragment" data-fragment-index="7">
<span
style="display: flex; flex-direction: column"
class="fragment fade-out"
data-fragment-index="11"
>
<span class="fragment" data-fragment-index="8"
>what parts involved?</span
>
<span class="fragment" data-fragment-index="9"
>local blockchain instance (Geth, Ganache)</span
>
<span class="fragment" data-fragment-index="10"
>facade for all blockchain related communication</span
>
</span>
</p>
<p
style="display: flex; justify-content: center; margin-top: 6%"
class="fragment fade-out"
data-fragment-index="7"
>
<span class="r-stack">
<span class="fragment" data-fragment-index="4"
>smart contracts</span
>
<span class="fragment" data-fragment-index="5">❌</span>
</span>
<span class="fragment" data-fragment-index="6"
> components</span
>
</p>
</div>
<div class="fragment" data-fragment-index="15">
<br/>
<p>Cypress + MetaMask = Synpress</p>
<br/>
<p>@testing-library</p>
<br/>
<p>@testing-library</p>
</div>
</div>
</section>
<section>
<p>video with Synpress running</p>
</section>
<section>
Environments
<img class="fragment" data-src="https://jsdzem.pl/wp-content/uploads/2022/06/environments.png" alt="Environments" />
</section>
</div>
</div>
<script src="dist/reveal.js"></script>
<script src="plugin/notes/notes.js"></script>
<script src="plugin/markdown/markdown.js"></script>
<script src="plugin/highlight/highlight.js"></script>
<script>
// More info about initialization & config:
// - https://revealjs.com/initialization/
// - https://revealjs.com/config/
Reveal.initialize({
hash: true,
// Learn about plugins: https://revealjs.com/plugins/
plugins: [RevealMarkdown, RevealHighlight, RevealNotes],
});
</script>
</body>
</html>