Comment créer un dictionnaire et ajouter dynamiquement des paires clé-valeur ?

Comment créer un dictionnaire et ajouter dynamiquement des paires clé-valeur ?

Cet article vous apprendra comment créer un dictionnaire en JavaScript en utilisant des objets pour stocker des paires clé-valeur. Bien que JavaScript n'ait pas de type de dictionnaire intégré, nous pouvons en créer un efficacement à l'aide d'objets JavaScript. Commençons par créer un nouvel objet JavaScript qui fera office de dictionnaire.

Syntaxe:

La clé peut être une chaîne, un entier. Si vous écrivez simplement key1 ou n’importe quel nombre, il sera traité comme une chaîne.

var dict = { key1 : value1 , key2 : value2 , .... }; 
  • Créer un dictionnaire vide
    var dict = {}; 
  • Ajout de paires clé-valeur dans le dictionnaire
    dict[new_key] = new_value; 
    ou Si new_key est déjà présent dans le dictionnaire, sa valeur sera mise à jour en new_value.
    dict.new_key = new_value; 
  • Accès aux paires clé-valeur
    var value = dict[key]; 
    ou
    var value = dict.key; 
  • Itérer tout le dictionnaire
    for(var key in dict) { console.log(key + ' : ' + dict[key]); } 

Exemple:

HTML
      Dictionnaire en Javascripttitre>tête> <body style='text-align: center;'>  <h1 style='color: green;'>techcodeview.com h1> <p>var dict = { <br />'geek' : 1 , <br />'pour 2', <br />'geeks' : 3,5 <br />} ; <br />p> <button onClick='fun()'>Bouton Ajouter de nouvelles paires clé-valeur> <p id='demo'>p> <script>function fun() { var dict = { geek : 1, pour : '2', geeks : 3.5, } ;  dict.new_geeks = 'nouvelle_valeur';  dict['another_new_geeks'] = 'another_value';  var to_show = 'var dict = { ';  for (var key in dict) { to_show += ''' + key + '' : ' + dict[key] + ' ';  } to_show += ' }; ';  document.getElementById('demo') .innerHTML = to_show;  } script> corps> html> </pre>  </code>  <p dir='ltr'>  <b>  <strong>Sortir: </strong>  </b>  </p>  <img src='//techcodeview.com/img/javascript-misc/88/how-create-dictionary.webp' alt=''>  <br>
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