April 2025
Intermediate to advanced
706 pages
22h 40m
Italian
Content preview from JavaScript: The Definitive Guide, 7a edizione
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Capitolo 14. Metaprogrammazione
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Questo capitolo di tratta una serie di funzioni avanzate di JavaScript che non sono comunemente utilizzate nella programmazione quotidiana, ma che possono essere preziose per i programmatori che scrivono librerie riutilizzabili e interessanti per chiunque voglia armeggiare con i dettagli del comportamento degli oggetti JavaScript.
Molte delle funzionalità descritte qui possono essere vagamente descritte come "metaprogrammazione": se la normale programmazione è scrivere codice per manipolare dati, la metaprogrammazione è scrivere codice per manipolare altro codice. In un linguaggio dinamico come JavaScript, i confini tra programmazione e metaprogrammazione sono molto labili: anche la semplice capacità di iterare sulle proprietà di un oggetto con un ciclo for/in potrebbe essere considerata "meta" da programmatori abituati a linguaggi più statici.
Gli argomenti di metaprogrammazione trattati in questo capitolo includono:
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§14.1 Controllo dell'enumerabilità, della cancellabilità e della configurabilità delle proprietà degli oggetti
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§14.2 Controllo dell'estensibilità degli oggetti e creazione di oggetti "sigillati" e "congelati"
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§14.3 Query e impostazione dei prototipi degli oggetti
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§14.4 Ottimizzare il comportamento dei tipi con i Simboli noti
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§14.5 Creare DSL (linguaggi specifici del dominio) con le funzioni ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.