¿Cómo crear un diccionario y agregar pares clave-valor de forma dinámica?
Este artículo le enseñará cómo crear un diccionario en JavaScript utilizando objetos para almacenar pares clave-valor. Aunque JavaScript no tiene un tipo de diccionario incorporado, podemos crear uno de manera efectiva usando objetos JavaScript. Comencemos creando un nuevo objeto JavaScript para que actúe como nuestro diccionario.
Sintaxis:
La clave puede ser una cadena, un número entero. Si simplemente escribe la clave1 o cualquier número, se tratará como una cadena.
var dict = { key1 : value1 , key2 : value2 , .... }; - Crear diccionario vacío
var dict = {}; - Agregar pares clave-valor en el diccionario
dict[new_key] = new_value;
O si new_key ya está presente en el diccionario, entonces el valor de esto se actualizará a new_value.dict.new_key = new_value;
- Acceso a pares clave-valor
var value = dict[key];
ovar value = dict.key;
- Iterando todo el diccionario
for(var key in dict) { console.log(key + ' : ' + dict[key]); }
Ejemplo:
HTML Diccionario en Javascripttítulo>cabeza> <body style='text-align: center;'> <h1 style='color: green;'>techcodeview.com h1> <p>vardict = { <br />'geek' : 1 , <br />'para 2', <br />'geeks' : 3.5 <br />}; <br />p> <button onClick='fun()'>Botón Agregar nuevos pares clave-valor> <p id='demo'>p> <script>función divertida() { var dict = { geek: 1, para: '2', geeks: 3.5, }; dict.new_geeks = 'nuevo_valor'; dict['otro_nuevo_geeks'] = 'otro_valor'; var to_show = 'var dict = { '; for (var clave en dict) { to_show += ''' + clave + '' : ' + dict[clave] + ' '; } to_show += ' }; '; document.getElementById('demo') .innerHTML = to_show; } script> cuerpo> html> </pre> </code> <p dir='ltr'> <b> <strong>Producción: </strong> </b> </p> <img src='//techcodeview.com/img/javascript-misc/88/how-create-dictionary.webp' alt=''> <br>
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