{"id":786,"date":"2024-07-30T21:01:46","date_gmt":"2024-07-30T19:01:46","guid":{"rendered":"https:\/\/blog.sutilweb.eu\/?page_id=786"},"modified":"2024-07-30T21:01:46","modified_gmt":"2024-07-30T19:01:46","slug":"008-propiedades-dinamicas-de-los-objetos","status":"publish","type":"page","link":"https:\/\/sutilweb.eu\/index.php\/lenguajes\/javascript\/javascript-practico\/09-nuevos-tipos-y-caracteristicas-en-javascript\/008-propiedades-dinamicas-de-los-objetos\/","title":{"rendered":"008. Propiedades din\u00e1micas de los objetos"},"content":{"rendered":"\n

En estos \u00faltimos cap\u00edtulos hemos estado viendo nuevas caracter\u00edsticas que han venido al est\u00e1ndar de Javascript, como los iteradores<\/strong>, los iterables<\/strong>, los generadores<\/strong>, los proxies<\/strong>…<\/p>\n\n\n\n\n\n\n\n

Hoy vamos a ver una nueva caracter\u00edstica, propia de los objetos<\/strong>, que son las propiedades din\u00e1micas<\/strong>, o tambi\u00e9n como se conoce en ingl\u00e9s, las computed properties<\/strong>.<\/p>\n\n\n\n

Hay veces, donde cuando estamos desarrollando tenemos la necesidad de crear propiedades al vuelo de manera din\u00e1mica de un objeto.<\/p>\n\n\n\n

Tenemos un nuevo mecanismo que crea las propiedades en un objeto.<\/p>\n\n\n\n

Lo vemos mejor en un ejm de como se construye a posteriori propiedades.<\/p>\n\n\n\n

Ejm<\/strong><\/p>\n\n\n\n

const objUsuarios = {};\nconsole.log(objUsuarios);\n\nconst usuarios = [\"Francisco\", \"Bea\", \"In\u00e9s\", \"Angel\"];\n\nusuarios.forEach((usuario, index) => objUsuarios[`id_${index}`] = usuario);\nconsole.log(objUsuarios);<\/pre>\n\n\n\n
Veamos un ejm de construir en el objeto propiedades din\u00e1micas<\/strong> con la notaci\u00f3n de los corchetes.<\/p>\n\n\n\n
Ejm completo<\/strong><\/p>\n\n\n\n
let aleatorio = Math.round(Math.random() * 100 + 5);\n\nconst objUsuarios = {\n  [`id_${aleatorio}`]: \"Valor aleatorio\",\n};\nconsole.log(objUsuarios);\n\nconst usuarios = [\"Francisco\", \"Bea\", \"In\u00e9s\", \"Angel\"];\n\nusuarios.forEach((usuario, index) =>objUsuarios[`id_${index}`] = usuario);\nconsole.log(objUsuarios);<\/pre>\n","protected":false},"excerpt":{"rendered":"
En estos \u00faltimos cap\u00edtulos hemos estado viendo nuevas caracter\u00edsticas que han venido al est\u00e1ndar de Javascript, como los iteradores, los […]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":766,"menu_order":7,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_uag_custom_page_level_css":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"class_list":["post-786","page","type-page","status-publish","hentry"],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false},"uagb_author_info":{"display_name":"Sutil Web","author_link":"https:\/\/sutilweb.eu\/index.php\/author\/sutilweb\/"},"uagb_comment_info":0,"uagb_excerpt":"En estos \u00faltimos cap\u00edtulos hemos estado viendo nuevas caracter\u00edsticas que han venido al est\u00e1ndar de Javascript, como los iteradores, los […]","_links":{"self":[{"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/pages\/786","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/comments?post=786"}],"version-history":[{"count":1,"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/pages\/786\/revisions"}],"predecessor-version":[{"id":787,"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/pages\/786\/revisions\/787"}],"up":[{"embeddable":true,"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/pages\/766"}],"wp:attachment":[{"href":"https:\/\/sutilweb.eu\/index.php\/wp-json\/wp\/v2\/media?parent=786"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}