Come creare un dizionario e aggiungere dinamicamente coppie chiave-valore?

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]; 
    O
    var 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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