{"id":10838,"date":"2022-08-19T13:00:00","date_gmt":"2022-08-19T11:00:00","guid":{"rendered":"https:\/\/carontestudio.com\/blog\/?p=10838"},"modified":"2023-01-25T15:38:50","modified_gmt":"2023-01-25T14:38:50","slug":"numeros-aleatorios-js","status":"publish","type":"post","link":"https:\/\/carontestudio.com\/blog\/numeros-aleatorios-js\/","title":{"rendered":"C\u00f3mo generar n\u00fameros aleatorios en JS"},"content":{"rendered":"\n<p>En este art\u00edculo te explico <strong>c\u00f3mo generar n\u00fameros aleatorios con JS<\/strong> y te muestro algunos de los ejemplos de uso m\u00e1s t\u00edpicos. \u00a1Empecemos!<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Funci\u00f3n para generar un numero aleatorio en JavaScript<\/h2>\n\n\n\n<p>Lo cierto es que JavaScript lo pone relativamente f\u00e1cil a la hora de generar n\u00fameros aleatorios, ya que dispone de una funci\u00f3n predefinida que permite implementar esta funcionalidad. Se trata del <strong>m\u00e9todo Math.random()<\/strong>. <\/p>\n\n\n\n<p>Esta funci\u00f3n crea un n\u00famero aleatorio decimal entre el 0 y el 1. Sin embargo, tiene la peculiaridad de que el rango de n\u00fameros aleatorios que puede generar van del 0 a menor que 1, de forma que <strong>genera un n\u00famero aleatorio en JS<\/strong> cuyo valor podr\u00e1 ser 0, pero nunca podr\u00e1 ser 1. <\/p>\n\n\n\n<p>A continuaci\u00f3n te muestro un <strong>ejemplo de c\u00f3digo<\/strong> que podr\u00e1s emplear para comprobar su funcionamiento: <\/p>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\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<pre class=\"wp-block-code\"><code>&lt;!DOCTYPE html&gt;\n&lt;html lang=\"en\"&gt;\n&lt;head&gt;\n    &lt;meta charset=\"UTF-8\"&gt;\n    &lt;meta http-equiv=\"X-UA-Compatible\" content=\"IE=edge\"&gt;\n    &lt;meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\"&gt;\n    &lt;title&gt;Document&lt;\/title&gt;\n&lt;\/head&gt;\n\n&lt;body&gt;\n    &lt;script&gt;\n        let random = Math.random();\n        console.log(random);\n    &lt;\/script&gt;\n&lt;\/body&gt;\n&lt;\/html&gt;<\/code><\/pre>\n<\/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>Puedes copiar dicho c\u00f3digo en un archivo con extensi\u00f3n .html y abrirlo con un navegador. A continuaci\u00f3n, pulsa la tecla F12 para abrir el inspector de elementos y, en la pesta\u00f1a <em>Console<\/em>, podr\u00e1s ver tu <strong>n\u00famero aleatorio JS<\/strong>. <\/p>\n\n\n\n<p>Por ejemplo, en mi caso se ha generado el valor 0.7323775835569271:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"302\" height=\"104\" src=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/08\/numeros-aleatorios-js.jpg\" alt=\"numero aleatorio js\" class=\"wp-image-10848\" srcset=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/08\/numeros-aleatorios-js.jpg 302w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/08\/numeros-aleatorios-js-300x104.jpg 300w\" sizes=\"auto, (max-width: 302px) 100vw, 302px\" \/><\/figure>\n<\/div><\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<p>En realidad, <strong>el c\u00f3digo JavaScript se corresponde \u00fanicamente con las dos l\u00edneas a\u00f1adidas entre las etiquetas &lt;script&gt;&lt;\/script&gt;<\/strong>, lo dem\u00e1s es c\u00f3digo HTML utilizado \u00fanicamente para crear el documento .html en el que se ejecuta JavaScript. <\/p>\n\n\n\n<p>En los ejemplos siguientes mostrar\u00e9 \u00fanicamente la parte del c\u00f3digo JS.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Generar n\u00fameros aleatorios en JavaScript del 1 al 100<\/h2>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\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>Es posible que la funcionalidad implementada en el ejemplo anterior se te quede corta, debido a que necesitas <strong>crear un n\u00famero aleatorio del 1 al 100 con JavaScript<\/strong>. <\/p>\n\n\n\n<p>Para ello, tendr\u00e1s que a\u00f1adir algunas l\u00edneas de c\u00f3digo al fragmento anterior. Ser\u00e1 necesario multiplicar el valor por 100 y sumarle una unidad, ya que de lo contrario se obtendr\u00eda un rango 0 &#8211; 99. Para ello, puedes emplear el siguiente c\u00f3digo:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;script&gt;\n        let random = Math.random();\n        random = random * 100 + 1;\n        console.log(random);\n&lt;\/script&gt;<\/code><\/pre>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"427\" src=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/08\/generar-numeros-aleatorios-javascript-1-100.jpg\" alt=\"numeros del 1 al 100\" class=\"wp-image-10927\" srcset=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/08\/generar-numeros-aleatorios-javascript-1-100.jpg 640w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/08\/generar-numeros-aleatorios-javascript-1-100-300x200.jpg 300w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/08\/generar-numeros-aleatorios-javascript-1-100-600x400.jpg 600w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/figure>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<p>Ahora bien, para finalizar correctamente el c\u00f3digo, <strong>ser\u00e1 necesario redondear el valor a la baja<\/strong>. De esta forma, se obtienen valores enteros (sin decimales) y siempre entre el 1 y el 100, ya que de lo contrario existir\u00eda la posibilidad de generar un n\u00famero con valor de 101. <\/p>\n\n\n\n<p>Realmente, redondear a la baja un n\u00famero y quitarle los decimales es lo mismo. En el siguiente ejemplo te muestro c\u00f3mo prescindir de los decimales y <strong>generar aleatoriamente de n\u00fameros del 1 al 100 con JS<\/strong>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Quitar decimales en JavaScript<\/h3>\n\n\n\n<p>Para quitar los decimales existe la <strong>funci\u00f3n Math.trunc()<\/strong>. Gracias ella, es posible obtener la parte entera de cualquier n\u00famero.  Para hacer uso de ella, simplemente tendr\u00e1s que pasarle como par\u00e1metro la variable sobre la que est\u00e9s trabajando, en nuestro caso <em>random<\/em>.<\/p>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\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<pre class=\"wp-block-code\"><code>&lt;script&gt;\n        let random = Math.random();\n        random = random * 100 + 1;\n        random = Math.trunc(random);\n        console.log(random);\n&lt;\/script&gt;<\/code><\/pre>\n<\/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>En mi caso, el resultado ha sido el siguiente:<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"233\" height=\"123\" src=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/08\/generar-numero-aleatorio-javascript.jpg\" alt=\"crear numeros aleatorios en js\" class=\"wp-image-10916\"\/><\/figure>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Generar un n\u00famero aleatorio del 1 al 10 en JS<\/h2>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\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>Quiz\u00e1s necesites <strong>generar n\u00fameros aleatorios con JS \u00fanicamente entre el 1 y el 10<\/strong>. En ese caso, puedes emplear pr\u00e1cticamente el mismo c\u00f3digo que se expone en el punto anterior. Simplemente ser\u00e1 necesario realizar la multiplicaci\u00f3n por 10 en vez de por 100:<\/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\">\n<pre class=\"wp-block-code\"><code>&lt;script&gt;\n        let random = Math.random();\n        random = random * 10 + 1;\n        random = Math.trunc(random);\n        console.log(random);\n&lt;\/script&gt;<\/code><\/pre>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Crear un array con n\u00fameros aleatorios en JavaScript<\/h2>\n\n\n\n<p>Puede que desees crear un array compuesto por m\u00faltiples n\u00fameros aleatorios en JavaScript. En ese caso, debes saber de antemano la cantidad de valores que contendr\u00e1 el array. <\/p>\n\n\n\n<p>En el siguiente ejemplo, te muestro <strong>c\u00f3mo rellenar un array de 10 elementos con n\u00fameros aleatorios en JavaScript<\/strong>:<\/p>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\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<pre class=\"wp-block-code\"><code>&lt;script&gt;\n        let lista = &#91;];\n        \/\/ Se ejecuta 10 veces\n        for (let i = 0; i &lt; 10; i++) {\n            let random = Math.random();\n            random = random * 10 + 1;\n            random = Math.trunc(random);\n            lista&#91;i] = random;\n        }\n        console.log(lista);\n&lt;\/script&gt;<\/code><\/pre>\n<\/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>El c\u00f3digo anterior ejecuta un <a href=\"https:\/\/developer.mozilla.org\/es\/docs\/Web\/JavaScript\/Guide\/Loops_and_iteration\" target=\"_blank\" rel=\"noreferrer noopener\">bucle for<\/a> que consta de 10 iteraciones (10 repeticiones). En cada una de ellas, se genera un n\u00famero aleatorio y se le asigna a una posici\u00f3n del array. Por \u00faltimo, se muestra el array por consola. En mi caso, ha generado los siguientes valores:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"alignleft size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"304\" height=\"117\" src=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/08\/numero-aleatorio-javascript.jpg\" alt=\"array numeros aleatorios javascript\" class=\"wp-image-10857\" srcset=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/08\/numero-aleatorio-javascript.jpg 304w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/08\/numero-aleatorio-javascript-300x115.jpg 300w\" sizes=\"auto, (max-width: 304px) 100vw, 304px\" \/><\/figure>\n<\/div><\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Generar n\u00fameros aleatorios sin repetir en JavaScript<\/h2>\n\n\n\n<div class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\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>En ocasiones, es posible que necesites <strong>crear un conjunto de n\u00fameros aleatorios en JavaScript que no se repitan entre s\u00ed<\/strong>. Este caso es m\u00e1s complejo que los anteriores, ya que requiere del uso de un mayor n\u00famero de estructuras iterativas (bucles) y condicionales. <\/p>\n\n\n\n<p>Es posible que existan diversas formas de llevarlo a cabo, pero en el siguiente ejemplo te muestro una de ellas. Con el siguiente script podr\u00e1s generar un array de 10 elementos compuesto por valores aleatorios irrepetibles del 1 y el 100:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;script&gt;\n        let lista = &#91;];\n        let repetido;\n        for (let i = 0; i &lt; 10; i++) {\n            while (!lista&#91;i]) {\n                repetido = true;\n                while (repetido == true) {\n                    let random = Math.random();\n                    random = random * 100 + 1;\n                    random = Math.trunc(random);\n                    for (let j = 0; j &lt; lista.length; j++) {\n                        if (lista&#91;j] == random) {\n                            repetido = true;\n                            break;\n                        } else {\n                            repetido = false;\n                        }\n                    }\n                    lista&#91;i] = random;\n                }\n\n            }\n        }\n        console.log(lista);\n&lt;\/script&gt;<\/code><\/pre>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\">\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"640\" height=\"960\" src=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/08\/numeros-aleatorios-sin-repetir-js.jpg\" alt=\"generar numeros aleatorios sin repetir en js\" class=\"wp-image-10930\" srcset=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/08\/numeros-aleatorios-sin-repetir-js.jpg 640w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/08\/numeros-aleatorios-sin-repetir-js-200x300.jpg 200w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/08\/numeros-aleatorios-sin-repetir-js-600x900.jpg 600w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/figure>\n<\/div>\n<\/div>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Conclusi\u00f3n<\/h2>\n\n\n\n<p>Como ves, generar n\u00fameros aleatorios en JavaScript puede ser sencillo, aunque existen ejemplos complejos, como es el caso de los n\u00fameros aleatorios que no se repiten entre s\u00ed. <\/p>\n\n\n\n<p><strong>Existen m\u00e1s funciones JavaScript que se pueden utilizar<\/strong> para realizar acciones de este tipo y formas distintas de obtener los mismos resultados.<\/p>\n\n\n\n<p>Sin embargo, <strong>puedes usar los scripts que te he ido mostrando<\/strong> para implementar las funcionalidades que necesites. <\/p>\n\n\n\n<p>\u00a1Hasta la pr\u00f3xima!<\/p>\n\n\n\n<div id=\"sabermas\" class=\"wp-block-group\"><div class=\"wp-block-group__inner-container is-layout-flow wp-block-group-is-layout-flow\">\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\/detectar-un-dispositivo-movil-en-javascript\/\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"604\" src=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/06\/como-detectar-dispositivos-moviles-con-javascript-1024x604.jpg\" alt=\"detectar moviles con javascript\" class=\"wp-image-10162\" srcset=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/06\/como-detectar-dispositivos-moviles-con-javascript-1024x604.jpg 1024w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/06\/como-detectar-dispositivos-moviles-con-javascript-300x177.jpg 300w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/06\/como-detectar-dispositivos-moviles-con-javascript-768x453.jpg 768w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/06\/como-detectar-dispositivos-moviles-con-javascript-600x354.jpg 600w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/06\/como-detectar-dispositivos-moviles-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\/como-obtener-el-valor-de-un-id-en-javascript\/\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"604\" src=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/05\/como-obtener-id-javascript-1024x604.jpg\" alt=\"como obtener un id con javascript\" class=\"wp-image-9856\" srcset=\"https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/05\/como-obtener-id-javascript-1024x604.jpg 1024w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/05\/como-obtener-id-javascript-300x177.jpg 300w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/05\/como-obtener-id-javascript-768x453.jpg 768w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/05\/como-obtener-id-javascript-600x354.jpg 600w, https:\/\/carontestudio.com\/blog\/wp-content\/uploads\/2022\/05\/como-obtener-id-javascript.jpg 1250w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>En este art\u00edculo te explico c\u00f3mo generar n\u00fameros aleatorios con JS y te muestro algunos de los ejemplos de uso m\u00e1s t\u00edpicos. \u00a1No te lo pierdas!<\/p>\n","protected":false},"author":21,"featured_media":10926,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[50],"tags":[],"class_list":["post-10838","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>N\u00fameros aleatorios en JS - Gu\u00eda completa - Blog Caronte Studio<\/title>\n<meta name=\"description\" content=\"En este art\u00edculo te explicamos c\u00f3mo generar n\u00fameros aleatorios con JS y te mostramos los ejemplos de uso m\u00e1s t\u00edpicos. \u00a1No te lo pierdas!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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