Come creare un dizionario e aggiungere dinamicamente coppie chiave-valore?
Questo articolo ti insegnerà come creare un dizionario in JavaScript utilizzando oggetti per memorizzare coppie chiave-valore. Sebbene JavaScript non abbia un tipo di dizionario integrato, possiamo crearne uno in modo efficace utilizzando gli oggetti JavaScript. Iniziamo creando un nuovo oggetto JavaScript che funga da dizionario.
Sintassi:
La chiave può essere una stringa, un numero intero. Se scrivi semplicemente key1 o qualsiasi numero, verrà trattato come una stringa.
var dict = { key1 : value1 , key2 : value2 , .... }; - Crea dizionario vuoto
var dict = {}; - Aggiunta di coppie chiave-valore nel dizionario
dict[new_key] = new_value;
oppure Se new_key è già presente nel dizionario, il suo valore verrà aggiornato a new_value.dict.new_key = new_value;
- Accesso alle coppie chiave-valore
var value = dict[key];
Ovar value = dict.key;
- Iterazione dell'intero dizionario
for(var key in dict) { console.log(key + ' : ' + dict[key]); }
Esempio:
HTML Dizionario in Javascripttitle> head> <body style='text-align: center;'> <h1 style='color: green;'>techcodeview.com h1> <p>var dict = { <br />'geek' : 1 , <br />'per' : '2', <br />'geek': 3.5 <br />}; <br />p> <button onClick='fun()'>Pulsante Aggiungi nuove coppie chiave-valore> <p id='demo'>p> <script>function fun() { var dict = { geek: 1, for: '2', geek: 3.5, }; dict.new_geeks = 'nuovo_valore'; dict['another_new_geeks'] = 'another_value'; var to_show = 'var dict = { '; for (var key in dict) { to_show += ''' + key + '' : ' + dict[key] + ' '; } mostrare_per += ' }; '; document.getElementById('demo') .innerHTML = to_show; } script> corpo> html> </pre> </code> <p dir='ltr'> <b> <strong>Produzione: </strong> </b> </p> <img src='//techcodeview.com/img/javascript-misc/88/how-create-dictionary.webp' alt=''> <br>
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