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85 changes: 85 additions & 0 deletions signals/css/js-engine.css
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#js-engine {
position: relative;
width: 100%;
height: 530px;
border: 3px white solid;
padding: 8px;
color: darkgrey;
}

#js-engine code {
font-size: 80%
}

#js-engine-core {
position: relative;
}

#call-stack {
position: absolute;
left: 45px;
width: 250px;
height: 210px;
margin: 0 auto 10px;
padding: 10px;
background-color: darkgrey;
color: #000000;
}

#event-table {
position: absolute;
left: 335px;
width: 250px;
height: 90px;
margin: 0 auto 10px;
padding: 10px;
background-color: darkgrey;
color: #000000;
}

#event-queue {
position: absolute;
top: 120px;
left: 335px;
width: 250px;
height: 90px;
margin: 0 auto 10px;
padding: 10px;
background-color: darkgrey;
color: #000000;
}

#console {
position: absolute;
left: 625px;
width: 265px;
height: 210px;
margin: 0 auto 10px;
padding: 10px;
background-color: darkgrey;
color: #000000;
}

#js-engine .code-element {
position: absolute;
width: 240px;
margin: 0 auto;
border: none;
}

#js-engine {
border: 2px solid grey;
}

#js-engine p {
color: black;
}

#js-engine pre {
box-shadow: none;
}

.reveal #js-engine pre code {
background: white;
color: black;
}
111 changes: 111 additions & 0 deletions signals/css/own.css
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.devon.reveal .title-with-image img {
margin-right: 0.5em;
}

.reveal h1.no_upper,
.reveal h2.no_upper,
.reveal h3.no_upper,
.reveal h4.no_upper,
.reveal h5.no_upper,
.reveal h6.no_upper {
text-transform: none;
}

.reveal section img {
border: none;
box-shadow: none;
}

.reveal section img.middle {
vertical-align : middle;
}

div.margin_top_30 {
margin-top: 30px;
}

h1.highlight, h2.highlight, h3.highlight, p.highlight, span.highlight {
color: #71e9f4;
}

div.column {
display: inline-block;
margin-right: 40px;
}

p.title_image img.white_solid_border {
border: 4px solid #ffffff;
}

p.justify_text {
text-align: justify;
}

p.align_right {
text-align: right;
}

.reveal pre {
border: 3px white solid;
}

.reveal p {
margin: 0;
}

.reveal #js-engine {
height: 560px;
}

.reveal .title_image img {
background: transparent;
margin: 0 40px;
}

.reveal section pre {
width: 100%;
}

.reveal section .list-style-none {
list-style: none
}

.reveal section .margin-top-40 {
margin-top: 40px;
}

html.img-center-fill div.slide-background.present {
background-position: center;
background-size: contain;
}

.reveal section .text-align-left {
text-align: left;
}

.reveal section .font-style-italic {
font-style: italic;
}

.reveal section div.side-by-side {
width: 960px;
}

.reveal section div.side-by-side div {
width: 45%;
display: inline-block;
vertical-align: top;
}

.reveal section pre code.code-without-max-height {
max-height: unset;
}

.reveal section .inline-block {
display: inline-block;
vertical-align: top;
}

.reveal section .margin-top-70 {
margin-top: 70px;
}
195 changes: 195 additions & 0 deletions signals/index.html
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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>Signals</title>
<link rel="icon" href="../common/img/favicon.ico">


<link href="https://fonts.googleapis.com/css?family=Ubuntu+Mono" rel="stylesheet">
<link href="https://fonts.googleapis.com/css?family=Ubuntu" rel="stylesheet">
<link rel="stylesheet" href="../node_modules/reveal.js/css/reveal.css">
<link rel="stylesheet" href="../node_modules/reveal.js/css/theme/white.css" id="theme">
<link rel="stylesheet" href="../common/css/common.css">
<link rel="stylesheet" href="css/own.css">
<link rel="stylesheet" href="css/js-engine.css">

<!-- Theme used for syntax highlighting of code -->
<link rel="stylesheet" href="../common/css/github-gist.css">

<!-- Printing and PDF exports -->
<script>
var link = document.createElement('link');
link.rel = 'stylesheet';
link.type = 'text/css';
link.href = window.location.search.match(/print-pdf/gi) ? '../node_modules/reveal.js/css/print/pdf.css' : '../node_modules/reveal.js/css/print/paper.css';
document.getElementsByTagName('head')[0].appendChild(link);
</script>
</head>
<body>
<section class="angular-link">
<a href="http://angular.io" target="_blank"><img height="50px" src="../common/img/angular.svg"></a>
</section>
<section class="devon-link">
<a href="http://devonfw.github.io" target="_blank"><img height="30px" src="../common/img/devon_logo_blue.png"></a>
</section>
<div class="devon reveal">
<div class="slides">
<section>
<p class="title_image">
<img height="200" src="../common/img/angular.svg">
</p>
<h2>Signals</h2>
<p></p>
<p></p>
</section>
<section>
<h3>Why Signals Matter?</h3>
<p class="justiy_text">Signals play a crucial role in managing state and updates in Angular applications. They enable efficient handling of UI updates and state changes, leading to enhanced user experience and better code organization.</p>
<pre><code style="border: none;" data-trim class="javascript">
// Define a signal
const count = signal(0);
</code></pre>

<div class="navigate-left enabled"></div>

</section>
<section>
<h3>What are Signals?</h3>
<p class="justiy_text">Signals are a mechanism for tracking and managing state changes within Angular applications. They provide a way to notify components about changes in data or application state.</p>
</section>
<section>
<h3>Signals - Key Concepts</h3>
<ul>
<li>Signals in Angular are wrappers around values that notify subscribers when the value changes.
</li>
<li>Signals can be either writable or read-only.
</li>
<li>Writable signals allow direct updating of their values using the set or update methods.
</li>
<li>Read-only signals derive their values from other signals and are defined using the computed function.
</li>
</ul>
</section>
<section>
<h3>Example</h3>

<pre><code data-trim class="javascript">
// Define a signal
const count = signal(0);

// Update the value of the signal
count.update(value => value + 1); // Output: Counter value: 1
count.update(value => value + 1); // Output: Counter value: 2
count.update(value => value + 1); // Output: Counter value: 3
</code></pre>
</section>
<section>
<h3>Computed Signals - Key Concepts</h3>
<ul>
<li>Computed signals derive their values from other signals and update automatically when their dependencies change.
</li>
<li>They are lazily evaluated and memoized for performance optimization.
</li>
<li>Computed signals are not writable and cannot be directly assigned new values.
</li>
</ul>
</section>
<section>
<h3>Example</h3>

<pre><code data-trim class="javascript">
const count: WritableSignal<number> = signal(0);
const doubleCount: Signal<number> = computed(() => count() * 2);

doubleCount.set(3);
</code></pre>
<p class="justiy_text"><strong>produces a compilation error, because doubleCount is not a WritableSignal.</strong></p>
<p>&nbsp;</p>
<p class="justiy_text">Whenever the count source signal has a new value, the derived signal also gets updated automatically.</p>

</section>
<section>
<h3>Effects</h3>
<ul>
<li>Effects are operations that run whenever one or more signal values change.</li>
<li>They are useful for tasks such as logging, DOM manipulation, or custom rendering.</li>
<li>Effects run asynchronously during the change detection process and are automatically cleaned up when no longer needed.</li>
</ul>
<pre><code data-trim class="javascript">
effect(() => {

// We just have to use the source signals
// somewhere inside this effect
console.log(`The current count is: ${count()}`);
});
</code></pre>
</section>
<section>
<h3>Signal Equality Functions</h3>
<ul>
<li>Signals can optionally specify an equality function to determine if a new value is different from the previous one.</li>
<li>Equality functions are useful for optimizing performance when dealing with complex data structures.</li>
</ul>
</section>
<section>
<h3>Injection Context</h3>
<ul>
<li>Effects require an injection context for registration, typically provided within components, directives, or services.</li>
<li>They can also be manually initialized using an Injector.</li>
</ul>
</section>
<section>
<h3>Effect Cleanup Functions</h3>
<ul>
<li>Effects can register cleanup functions that are invoked before the next run of the effect or when the effect is destroyed.</li>
<li>Cleanup functions are useful for canceling long-running operations or releasing resources.</li>
</ul>
</section>
<section>
<h3>Example Code</h3>
<p class="justiy_text">Let's take a look at a basic example to understand how signals work in practice.</p>
<pre><code data-trim class="javascript">
// main.ts
import { signal } from "@angular/core";

export const count = signal(0);

// app.component.ts
import { Component } from "@angular/core";
import { count } from "./main";

@Component({
selector: "app",
template: `
<div>
<p>Counter: {{ count() }}</p>
<button (click)="increment()">Increment from HundredIncrComponent</button>
</div>
`,
})
export class HundredIncrComponent {
count = count;

increment() {
this.count.update((value) => value + 100);
}
}
</code></pre>
</section>
</div>
</div>

<script src="../node_modules/reveal.js/js/reveal.js"></script>
<script src="../common/reveal-config.js"></script>
<script src="lib/jquery/jquery.min.js"></script>
<script src="js/js-engine.js"></script>

<script>
// More info https://github.com/hakimel/reveal.js#configuration
Reveal.initialize({ ...revealConfig });
</script>
</body>
</html>
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