{"id":16235,"date":"2023-09-05T13:30:00","date_gmt":"2023-09-05T11:30:00","guid":{"rendered":"https:\/\/carontestudio.com\/blog\/?p=16235"},"modified":"2023-10-25T13:23:38","modified_gmt":"2023-10-25T11:23:38","slug":"como-iterar-arrays-en-javascript","status":"publish","type":"post","link":"https:\/\/carontestudio.com\/blog\/como-iterar-arrays-en-javascript\/","title":{"rendered":"C\u00f3mo iterar un Array en JavaScript"},"content":{"rendered":"\n<p>En esta entrada, vamos a explorar c\u00f3mo recorrer o <strong>iterar un array<\/strong> de principio a fin, brind\u00e1ndote la capacidad de trabajar con ellos para que puedas desenvolverte en este tipo de situaciones y otras muchas.<\/p>\n\n\n\n<p>Los arrays o matrices (tambi\u00e9n llamados arreglos, vectores, incluso listas, dependiendo del contexto), son simplemente listas de valores, generalmente del mismo tipo, en los cuales a menudo es \u00fatil poder acceder a estos valores de forma individual y trabajar con ellos.<\/p>\n\n\n\n<p>Muchas veces vamos a querer <a href=\"https:\/\/carontestudio.com\/blog\/agregar-estilo-con-javascript\/\" target=\"_blank\" rel=\"noreferrer noopener\">mostrar elementos en el DOM<\/a> agreg\u00e1ndolos con JavaScript partiendo de listas, modificar datos como aumentar el n\u00famero de art\u00edculos en el carrito de la compra de tu e-commerce o tener que validar valores antes de operar con ellos.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Formas de iterar un array<\/h2>\n\n\n\n<p>Hay m\u00e1s maneras de iterar un array, incluso hay algunas que son para ocasiones concretas, como cuando queremos ordenarlo, eliminar ciertos elementos, o hacer una operaci\u00f3n con todos los elementos y obtener un valor \u00fanico, como puede ser una cadena con la uni\u00f3n de cadenas m\u00e1s peque\u00f1as.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<p>No obstante, en esta entrada vamos a ver los que ofrecen la posibilidad de explorar el array entero de forma general.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Bucle For<\/strong><\/h3>\n\n\n\n<p>Una de las formas m\u00e1s comunes en JavaScript, e incluso en otros lenguajes de programaci\u00f3n, es mediante un bucle for. Es muy sencillo:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let array = &#91;1, 2, 3];\n\nfor (let i = 0; i &lt; array.length; i++) {\n    console.log(array&#91;i]);\n}<\/code><\/pre>\n\n\n\n<p>Con esto, <strong>definimos <\/strong>la variable <code>i<\/code> y la <strong>inicializamos <\/strong>a 0. Usamos el m\u00e9todo <code>length<\/code> para obtener el tama\u00f1o del array (el n\u00famero de valores contenidos). Luego, con <code>i++<\/code>, <strong>incrementamos<\/strong> el valor de <code>i<\/code>, de modo que <code>i<\/code> apuntar\u00e1 a posiciones distintas de nuestro array.<\/p>\n\n\n\n<p>\u00bfF\u00e1cil, verdad?<\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\"><div class=\"wp-block-image\">\n<figure class=\"alignright size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"515\" height=\"687\" src=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2023\/09\/portatil-vsc-edited.jpg\" alt=\"Formas de iterar un array\" class=\"wp-image-16261\" style=\"width:402px;height:603px\" srcset=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2023\/09\/portatil-vsc-edited.jpg 515w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2023\/09\/portatil-vsc-edited-225x300.jpg 225w\" sizes=\"auto, (max-width: 515px) 100vw, 515px\" \/><\/figure>\n<\/div><\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>For &#8230; of<\/strong><\/h3>\n\n\n\n<p>Aqu\u00ed la cosa se vuelve a\u00fan m\u00e1s sencilla:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let array = &#91;1, 2, 3];\n\nfor (let value of array) {\n    console.log(value);\n}<\/code><\/pre>\n\n\n\n<p>Literalmente, le hemos dicho \u00abpara cada valor en el array, saca por consola el valor\u00bb. En lugar de tener un \u00edndice (como <code>i<\/code> en el caso del for), este enfoque va devolviendo los valores uno tras otro.<\/p>\n\n\n\n<p>\u00a1Ahora m\u00e1s f\u00e1cil incluso!<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>forEach<\/strong><\/h3>\n\n\n\n<p>En 2015, lleg\u00f3 la actualizaci\u00f3n de JavaScript ES5 (<a href=\"https:\/\/www.w3schools.com\/js\/js_es5.asp\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">ECMAScript 5<\/a>), y con ella, <code>forEach<\/code>, dejando un poco de lado las formas anteriores de recorrer un array (hoy en d\u00eda se usan todas ellas, pero para realizar la iteraci\u00f3n forEach es la m\u00e1s c\u00f3moda). Se utiliza generalmente de la siguiente forma:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let array = &#91;1, 2, 3]\n\narray.forEach(value =&gt; {\n    console.log(value);\n});<\/code><\/pre>\n\n\n\n<p>Para cada valor de \u00abarray\u00bb, devu\u00e9lveme su \u00abvalue\u00bb y s\u00e1calo por consola. A veces, puede interesarnos conocer a qu\u00e9 <strong>posici\u00f3n est\u00e1 apuntando<\/strong> en ese instante, e incluso pasarle el propio array, aunque estos dos argumentos no son necesarios. Con <code>forEach<\/code>, podemos verlo:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let array = &#91;1, 2, 3]\n\narray.forEach((value, index, arr) =&gt; {\n    console.log(`<span style=\"background-color: initial; font-family: inherit; font-size: inherit; color: initial;\">El valor ${value} corresponde a la posici\u00f3n ${index}`);<\/span><code>    console.log(<span style=\"background-color: initial; font-family: inherit; font-size: inherit; color: initial;\">`Este es el array original: ${arr}`;<\/span><\/code>});<\/code><\/pre>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\"><div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"427\" height=\"547\" src=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2023\/09\/smartphone-eat-sleep-code-repeat.jpg\" alt=\"Iterar un array en JavaScript\" class=\"wp-image-16255\" srcset=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2023\/09\/smartphone-eat-sleep-code-repeat.jpg 427w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2023\/09\/smartphone-eat-sleep-code-repeat-234x300.jpg 234w\" sizes=\"auto, (max-width: 427px) 100vw, 427px\" \/><\/figure>\n<\/div><\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<p>Vale, estas maneras de iterarlo est\u00e1n muy bien, pero \u00bfqu\u00e9 pasa si queremos operar con uno de estos arrays? Por ejemplo, si tengo este array:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let array = &#91;1, 2, 3, 4, 5];<\/code><\/pre>\n\n\n\n<p>y queremos restarle uno a cada n\u00famero:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>array.forEach(numero =&gt; {\n    numero = numero - 1;\n});<\/code><\/pre>\n\n\n\n<p>Hmm, esto parece que no funciona\u2026 \ud83e\udd14<\/p>\n\n\n\n<p>Probemos as\u00ed, vamos a crear uno nuevo:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let nuevoArray = &#91;];\n\narray.forEach(numero =&gt; {\n    nuevoArray.push(numero - 1);\n});<\/code><\/pre>\n<\/div>\n<\/div>\n\n\n\n<p>Hasta aqu\u00ed genial, pero \u00bfy si queremos modificar cosas m\u00e1s serias? O hablamos de arrays de objetos, \u00a1por ejemplo! Para eso est\u00e1 el m\u00e9todo&#8230;<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Array.map()<\/h3>\n\n\n\n<p><code>map<\/code> es un m\u00e9todo<strong> inmutable, no genera cambios<\/strong> en nuestro array principal, a diferencia de <code>forEach<\/code>. Esto es especialmente \u00fatil cuando trabajamos con librer\u00edas como React.js, donde a menudo tomamos variables de otro componente o de una API y no queremos que estas se modifiquen, pero queremos usar los valores con un valor a\u00f1adido. Por ejemplo, crear elementos HTML con distintos t\u00edtulos y descripciones para una lista de tareas. En cualquier caso, no profundizaremos en esto en esta entrada, pero vamos a ver c\u00f3mo se usa el m\u00e9todo en cuesti\u00f3n:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let array = &#91;1, 2, 3, 4, 5];\n\nconst nuevoArray = array.map(num =&gt; {\n    return num - 1;\n});<\/code><\/pre>\n\n\n\n<p><code>map<\/code> va a iterar nuestro array generando uno nuevo, aplicando a este los cambios que se le indiquen en la funci\u00f3n que le pasemos como callback (en este caso \u00abnum &#8211; 1\u00bb con el argumento \u00abnum\u00bb), cuando termine <strong>el array completo quedar\u00e1 almacenado<\/strong> en \u00abnuevoArray\u00bb. <\/p>\n\n\n\n<p>Si hacemos un <code>console.log(nuevoArray)<\/code>, veremos c\u00f3mo obtenemos <code>[0, 1, 2, 3, 4]<\/code> \ud83e\ude84\u2728<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"502\" height=\"375\" src=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2023\/09\/captura-vsc.jpg\" alt=\"C\u00f3digo para iterar un array\" class=\"wp-image-16254\" srcset=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2023\/09\/captura-vsc.jpg 502w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2023\/09\/captura-vsc-300x224.jpg 300w\" sizes=\"auto, (max-width: 502px) 100vw, 502px\" \/><\/figure>\n<\/div>\n\n\n<p>Al igual que en el m\u00e9todo <code>forEach<\/code>, permite tambi\u00e9n pasarle como argumento el \u00edndice y el propio array:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>let nuevoArray = array.map((num, index, arr) =&gt; {\n  return num - 1;\n});<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusi\u00f3n<\/h2>\n\n\n\n<p>Como hemos visto, tenemos diferentes maneras de hacer lo mismo, pero para situaciones distintas. <\/p>\n\n\n\n<p>Hemos cubierto varias formas de recorrer un array, desde el cl\u00e1sico <strong>bucle for<\/strong> hasta los m\u00e9todos <strong>forEach <\/strong>y <strong>map<\/strong>. Cada enfoque tiene sus propias ventajas y casos de uso, lo que te brinda la flexibilidad necesaria para abordar una variedad de situaciones en tus proyectos de <a href=\"https:\/\/carontestudio.com\/diseno-web\/diseno-web-vitoria\/\">dise\u00f1o web<\/a>.<\/p>\n\n\n\n<p>Exploraremos m\u00e1s m\u00e9todos en pr\u00f3ximas entradas. Mientras tanto, puedes investigar por tu cuenta otros muchos m\u00e9todos que tiene JavaScript para operar con arrays.<\/p>\n\n\n\n<p>Si tienes alguna pregunta o deseas profundizar en alg\u00fan aspecto espec\u00edfico, no dudes en dejarnos tus comentarios.<\/p>\n\n\n\n<div class=\"wp-block-columns sabermas is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/carontestudio.com\/blog\/cambiar-valor-de-un-select-javascript\/\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"604\" src=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2023\/07\/cambiar-el-valor-de-un-select-con-javascript-1024x604.jpg\" alt=\"cambiar select javascript\" class=\"wp-image-15000\" srcset=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2023\/07\/cambiar-el-valor-de-un-select-con-javascript-1024x604.jpg 1024w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2023\/07\/cambiar-el-valor-de-un-select-con-javascript-300x177.jpg 300w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2023\/07\/cambiar-el-valor-de-un-select-con-javascript-768x453.jpg 768w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2023\/07\/cambiar-el-valor-de-un-select-con-javascript.jpg 1250w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/carontestudio.com\/blog\/expresiones-regulares-en-javascript\/\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"604\" src=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/01\/regex-javascript-1024x604.jpg\" alt=\"Regex en javascipt\" class=\"wp-image-8590\" srcset=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/01\/regex-javascript-1024x604.jpg 1024w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/01\/regex-javascript-300x177.jpg 300w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/01\/regex-javascript-768x453.jpg 768w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/01\/regex-javascript.jpg 1250w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Aprende c\u00f3mo puedes iterar un Array en JavaScript para poder aplicarlo en tus proyectos web. \u00a1No te lo pierdas!<\/p>\n","protected":false},"author":18,"featured_media":16248,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[50],"tags":[],"class_list":["post-16235","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-programacion-web"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>C\u00f3mo iterar un array en JavaScript - Caronte Web Studio<\/title>\n<meta name=\"description\" content=\"Descubre las formas esenciales para iterar un array en JavaScript. 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