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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Reveal JS presentation</title>
<meta name="description" content="A framework for easily creating beautiful presentations using HTML">
<meta name="author" content="Hakim El Hattab">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="libs/reveal.js/4.3.1/reset.css">
<link rel="stylesheet" href="libs/reveal.js/4.3.1/reveal.css">
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<!-- highlight Theme -->
<link rel="stylesheet" href="libs/highlight.js/11.3.1/styles/github-dark.min.css">
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<!-- Revealjs Theme -->
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<link rel="stylesheet" href="libs/styles/iota.css">
<link rel="stylesheet" href="libs/styles/layout.css">
<!-- Revealjs Theme -->
<!-- css list -->
</head>
<body>
<div class="reveal">
<!-- Any section element inside of this container is displayed as a slide -->
<div class="slides">
<section >
<h1>Javascript - le basi</h1>
</section>
<section>
<section >
<h2>Const</h2>
<p>Il valore di una costante non può essere modificato</p>
<pre><code class="language-js">const invariabile = 5;
invariabile = 6; // NO!
// TypeError: Assignment to constant variable.
</code></pre>
</section>
<section >
<h2>Const</h2>
<p>Se la costante è un oggetto o un array,
le sue proprietà o i suoi elementi
possono essere modificati!</p>
<pre><code class="language-js">const nomeCostante = {}; // Oggetto
nomeCostante.proprieta = 1; // OK:
// ho modificato una proprietà dell'oggetto,
// ma non l'oggetto in sè
</code></pre>
</section>
<section >
<h2>Let</h2>
<p>Può cambiare nel tempo</p>
<pre><code class="language-js">let nomeLet = "valore";
nomeLet = {
proprieta: "valore",
altra: 123
};
</code></pre>
<p>Si può fare, ma è sconsigliato modificare il tipo di dato di una variabile!</p>
</section>
<section >
<h2>Var</h2>
<p>Sintassi valida ma non più in uso</p>
<pre><code class="language-js">var nomeVariabile = "valore";
</code></pre>
<p>al suo posto, utilizza <code>const</code> e <code>let</code></p>
</section>
</section>
<section>
<section >
<h2>Oggetti</h2>
<pre><code class="language-js">const myObject = {
proprieta1: "valore",
proprieta2: "altro valore"
};
</code></pre>
<p>Accedere al valore di una proprietà:</p>
<pre><code class="language-js">// sintassi equivalenti
const proprieta1 = myObject["proprieta1"];
const proprieta2 = myObject.proprieta2;
</code></pre>
</section>
<section >
<h2>{Destructuring}</h2>
<p>Estrae una o più proprietà di un oggetto e le assegna a delle variabili</p>
<pre><code class="language-js">const { inputPath, url, postId, tags, ...postContent } = apiPost;
</code></pre>
<p><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring">Approfondisci su MDN</a></p>
</section>
<section >
<h2>…Spread</h2>
<pre><code class="language-js">const oldObject = {
"key1": "first value",
"key2": "second value",
"key3": "third value"
};
const myObject = {
"key0": "zeroth value",
...oldObject
};
// > myObject: Object { key0: "zeroth value", key1: "first value", key2: "second value", key3: "third value" }
</code></pre>
<p><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax">Approfondisci su MDN</a></p>
</section>
<section >
<h2>Funzione <em>Object.entries()</em></h2>
<pre><code class="language-js">const utente = { nome: "Mario", cognome: "Rossi" };
const proprietaUtente = Object.entries(utente);
/*
proprietaUtente = [
["nome", "Mario"],
["cognome", "Rossi"]
]
*/
</code></pre>
<p>Genera un array di coppie chiave/valore</p>
</section>
<section >
<h3>Esempio di utilizzo di <em>Object.entries()</em></h3>
<pre><code class="language-js">const utente = { nome: "Mario", cognome: "Rossi" };
Object.entries(utente).forEach(([chiave, valore]) => {
// esegue qualcosa su ciascuna coppia chiave/valore dell'oggetto
console.log("- ", chiave, " -> ", valore);
});
/*
- nome -> Mario
- cognome -> Rossi
*/
</code></pre>
</section>
</section>
<section>
<section >
<h2>Array</h2>
<pre><code class="language-js">const myArray = [
"stringa",
123,
true,
{ "proprietàOggetto": "valore" },
["array"]
];
</code></pre>
</section>
<section >
<p>Accedere al valore in una determinata posizione:</p>
<pre><code class="language-js">const primoElementoDellArray = myArray[0]; // "stringa"
const secondoElementoDellArray = myArray[1]; // 123
</code></pre>
</section>
<section >
<h2>[Destructuring]</h2>
<p>Estrae uno o più elementi di un array e li assegna a variabili</p>
<pre><code class="language-js">const myArray = ["stringa", 2, 3];
// destructuring
const [primo, secondo, terzo] = myArray;
// > primo === "stringa";
// > secondo === 2;
// > terzo === 3
</code></pre>
<p>(puoi nominare liberamente le variabili)</p>
</section>
<section >
<h2>[Destructuring]</h2>
<pre><code class="language-js">const myArray = ["stringa", "secondo", 3];
// non devi per forza estrarre tutti gli elementi
const [primo, , terzo] = myArray;
// > primo === "stringa"; terzo === 3
</code></pre>
</section>
<section >
<h2>…Spread</h2>
<pre><code class="language-js">const myArray = [ 4, 5, 6 ];
const myMergedArray = [ 1, 2, 3, ...myArray ];
// > Array(6) [ 1, 2, 3, 4, 5, 6 ]
</code></pre>
</section>
<section >
<h2>…Spread</h2>
<pre><code class="language-js">function concatStrings(...args) {
return args.join(' ');
}
concatStrings("Hello", "world")
</code></pre>
</section>
<section >
<h2>Metodi degli array</h2>
<p>forEach(callback)</p>
<pre><code class="language-js">myArray.forEach((el) => {
el = el + "stringa";
});
myArray === myArray;
// vengono modificati gli elementi contenuti nell'array
// non l'array in sè
</code></pre>
<p>Modifica ogni elemento dell’array, applicando la funzione di callback</p>
</section>
<section >
<h2>Metodi degli array</h2>
<p>map(callback)</p>
<pre><code class="language-js">const newArray = myArray.map((el) => {
el = el + "stringa";
return el;
})
newArray !== myArray;
// il metodo map() genera un nuovo array
</code></pre>
<p>Ritorna un nuovo array, con gli elementi modificati dalla callback</p>
</section>
<section >
<h2>Altri metodi degli array</h2>
<ul>
<li><code>Sort:</code> riordina gli elementi dell’array</li>
<li><code>Find:</code> trova un elemento</li>
<li><code>Filter</code>: elimina alcuni elementi</li>
<li><code>Reduce</code>: elabora tutti gli elementi in un unico risultato</li>
<li><code>Join:</code> unisce due o più array</li>
</ul>
</section>
<section >
<h2>Approfondisci</h2>
<p><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Loops_and_iteration">https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Loops_and_iteration</a></p>
</section>
</section>
<section>
<section >
<h2>Funzioni</h2>
<pre><code class="language-js">const miaFunzione = function nomeFunzione() {
//...
}
const miaArrowFunction = () => {
//...
}
const funzioneConParametri = (param1, param2) => {
return param1 + " " + param2;
}
</code></pre>
</section>
<section >
<h2>First class functions</h2>
<p>Si può assegnare una funzione a una variabile</p>
<pre><code class="language-js">const foo = () => {
console.log("foobar");
};
foo();
</code></pre>
</section>
<section >
<h2>First class functions</h2>
<p>Si può passare una funzione come argomento di un’altra funzione</p>
<pre><code class="language-js">function eseguiOperazione(operazione, a, b) {
return operazione(a, b);
}
function somma(a, b) {
return a + b;
}
eseguiOperazione(somma, 5, 3); // Restituisce 8
</code></pre>
</section>
<section >
<h2>First class functions</h2>
<p>Una funzione può ritornare una nuova funzione</p>
<pre><code class="language-js">function creaFunzioneGreeting(saluto) {
return function(nome) {
return `${saluto}, ${nome}!`;
};
}
const salutaInItaliano = creaFunzioneGreeting("Ciao");
salutaInItaliano("Marco"); // Restituisce "Ciao, Marco!"
</code></pre>
</section>
<section >
<h2>First class functions</h2>
<p>Le funzioni possono avere proprietà e metodi come gli altri oggetti</p>
<pre><code class="language-js">function test() {}
test.descrizione = "Questa è una proprietà della funzione 'test'";
</code></pre>
</section>
<section >
<h2>Approfondisci</h2>
<p><a href="https://developer.mozilla.org/en-US/docs/Glossary/First-class_Function">https://developer.mozilla.org/en-US/docs/Glossary/First-class_Function</a></p>
</section>
<section >
<h2>Currying</h2>
<p>Funzioni che ritornano altre funzioni, con una sintassi fluida</p>
<pre><code class="language-js">const chiama = (nome) => (functionCognome) => {
return nome + " " + cognome;
}
// posso chiamarla così:
chiama("Mario")("Bianchi");
// oppure in più step,
// assegnando a una variabile la funzione generata:
const chiamaPaolo = chiama("Paolo");
chiamaPaolo("Rossi");
</code></pre>
</section>
<section >
<h2>Approfondisci</h2>
<p><a href="https://it.javascript.info/currying-partials">https://it.javascript.info/currying-partials</a></p>
</section>
</section>
<section>
<section >
<h2>Funzioni asincrone</h2>
</section>
<section >
<pre><code data-trim="" data-line-numbers="|13|19|14|15|16|20|7-11|21|1-5|22" class="language-js">function saluta() {
setTimeout(() => {
console.log("Ciao");
}, 1000);
}
const chiama = (nome) => {
setTimeout(() => {
console.log("Ehi, " + nome + "!");
}, 0); // timeout = zero
}
console.log("Inizio");
saluta();
chiama("Mario");
console.log("Fine");
/* Output:
Inizio
Fine
Ehi, Mario!
Ciao
*/
</code></pre>
</section>
<section >
<h2>Approfondisci</h2>
<div class="iframe-container">
<iframe frameborder="0" src="https://youtu.be/N0Au8yc5IOw?si=T0TvfQ-4fFJJL1Gi"></iframe>
</div>
<p><a href="https://youtu.be/N0Au8yc5IOw?si=T0TvfQ-4fFJJL1Gi">JavaScript Event Loop</a></p>
</section>
<section >
<h2>Come posso controllare l’ordine di esecuzione delle funzioni asincrone?</h2>
</section>
<section >
<h2>Callback</h2>
<pre><code data-trim="" data-line-numbers="|14|1-6|17|4|8-12|18" class="language-js">function saluta(cb) {
setTimeout(() => {
console.log("Ciao");
cb(); // <- esegue la callback
}, 1000);
}
const chiama = (nome) => {
setTimeout(() => {
console.log("Ehi, " + nome + "!");
}, 0);
}
saluta(() => chiama("Paolo"));
/* Output:
Ciao
Ehi, Paolo!
*/
</code></pre>
</section>
<section >
<h3>Attenzione</h3>
<p>La funzione <code>chiama()</code> si aspetta un parametro.</p>
<p>Poiché la funzione <code>saluta()</code> non passa nessun parametro alla callback,<br>
<code>chiama("Paolo")</code> viene eseguita in una callback che non ha parametri!</p>
<pre><code class="language-js">saluta( function cb(/* nessun parametro */) { chiama("Paolo") } );
</code></pre>
</section>
<section >
<h2>Promise</h2>
<ul>
<li>è un oggetto che rappresenta un’operazione asincrona</li>
<li>ha 3 metodi:
<ul>
<li><em>then(fn)</em> -> esegue <em>fn()</em> come callback in caso di success</li>
<li><em>catch(fn)</em> -> esegue <em>fn()</em> in caso di errore</li>
<li><em>finally(fn)</em> -> esegue <em>fn()</em> in entrambi i casi</li>
</ul>
</li>
</ul>
</section>
<section >
<h2>Promise: vantaggi</h2>
<ul>
<li>permette di concatenare molte funzioni asincrone una dopo l’altra, invece che una dentro l’altra, come avveniva con le callback</li>
<li>permette di gestire gli errori in modo standardizzato</li>
</ul>
</section>
<section >
<h2>Promise: come si costruisce</h2>
<pre><code data-trim="" data-line-numbers="|19|2|5|11|14" class="language-js">function saluta() {
return new Promise((resolve) => {
setTimeout(() => {
console.log("Ciao");
resolve();
}, 1000);
});
}
const chiama = (nome) => {
return new Promise((resolve) => {
setTimeout(() => {
console.log("Ehi, " + nome + "!");
resolve();
}, 0);
});
}
</code></pre>
</section>
<section >
<h2>Promise: come si usa</h2>
<pre><code class="language-js">saluta()
.then(() => chiama("Paolo"))
.then(saluta)
.then(() => { console.log("Fine") });
/* Output:
Ciao
Ehi, Paolo!
Ciao
Fine
*/
</code></pre>
</section>
<section >
<h2>Promise: come si gestiscono gli errori</h2>
<pre><code data-line-numbers="|1|9|1-2|10|1-3|6|11" class="language-js">saluta()
.then(() => chiama("Paolo"))
.then(() => { throw new Error("Ops, qualcosa è andato storto") })
.then(saluta)
.then(() => { console.log("Fine") })
.catch((err) => console.error(err.message));
/* Output:
Ciao
Ehi, Paolo!
Ops, qualcosa è andato storto
*/
</code></pre>
</section>
<section >
<h2>Approfondisci</h2>
<p><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise">https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise</a></p>
</section>
<section >
<h2>Async/await</h2>
<p>E’ una sintassi ancora più comoda per scrivere ed eseguire Promise</p>
</section>
<section >
<h2>Async/await</h2>
<pre><code data-trim="" data-line-numbers="|26|19|20|29|21|1-8|4|30|5|22|10-17|13|31|14|23|32" class="language-js">async function saluta() {
return new Promise((resolve) => {
setTimeout(() => {
console.log("Ciao");
resolve();
}, 1000);
});
}
const chiama = async (nome) => {
return new Promise((resolve) => {
setTimeout(() => {
console.log("Ehi, " + nome + "!");
resolve();
}, 0);
});
}
const main = async () => {
console.log("Inizio");
await saluta();
await chiama("Paolo");
console.log("Fine");
}
main();
/* Output:
Inizio
Ciao
Ehi, Paolo!
Fine
*/
</code></pre>
</section>
</section>
<section>
<section >
<h2>Mapping con funzioni asincrone</h2>
</section>
<section >
<p>Problema: abbiamo un array da mappare su una funzione asincrona</p>
<pre><code class="language-js">const result = [1, 2, 3, 4].map(async (id) => {
return await getById(id);
})
</code></pre>
</section>
<section >
<p>Questa funzione ritorna:</p>
<pre><code class="language-js">[Promise, Promise, Promise, Promise]
</code></pre>
<p>mentre ci aspettavamo:</p>
<pre><code class="language-js">["valuea", "value2", "value3", "value4"]
</code></pre>
</section>
<section >
<p>Soluzione: <code>Promise.all()</code></p>
<pre><code class="language-js">const result = Promise.all(
[1, 2, 3, 4].map(async (id) => {
return await getById(id);
})
);
</code></pre>
</section>
<section >
<p><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise/all">Approfondisci su MDN</a></p>
</section>
</section>
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