{"id":7561,"date":"2020-04-07T16:39:52","date_gmt":"2020-04-07T16:39:52","guid":{"rendered":"https:\/\/www.jose-aguilar.com\/blog\/?p=7561"},"modified":"2020-04-07T16:45:22","modified_gmt":"2020-04-07T16:45:22","slug":"5-formas-diferentes-para-recorrer-un-array-con-javascript","status":"publish","type":"post","link":"https:\/\/www.jose-aguilar.com\/blog\/5-formas-diferentes-para-recorrer-un-array-con-javascript\/","title":{"rendered":"5 formas para recorrer un array con JavaScript"},"content":{"rendered":"

En este art\u00edculo vas a ver 5 formas distintas que permiten recorrer un array con JavaScript<\/strong>.<\/p>\n

Un loop o bucle en cualquier lenguaje de programaci\u00f3n usualmente es c\u00f3digo que se repite una y otra vez hasta que cierta condici\u00f3n se cumple.<\/p>\n

1- Recorrer un array con JavaScript usando for<\/h2>\n
<\/a>Source code<\/a><\/td><\/a> <\/a> <\/a> <\/td><\/tr><\/table><\/div>
for<\/span> (<\/span>let i =<\/span> 0<\/span>;<\/span> i <<\/span> 10<\/span>;<\/span> i++<\/span>)<\/span> {<\/span>\n    console.log<\/span>(<\/span>`Numero:<\/span> ${<\/span>i}<\/span>`)<\/span>;<\/span>\n}<\/span><\/pre><\/div><\/div>\n
Inicializamos la variable i en 0, se ejecutar\u00e1 hasta que i tenga un valor menor que 10 y se incrementar\u00e1 de 1 en 1.<\/p>\n
En cada iteraci\u00f3n, imprimo el valor de la variable en la consola.<\/p>\n
La ventaja que tiene el for es que recorre cierta cantidad de c\u00f3digo hasta que la condici\u00f3n se cumpla y puede ser muy \u00fatil cuando est\u00e1s leyendo registros de una base de datos y, f\u00e1cilmente puedes limitar la cantidad de registros a procesar.<\/p>\n
2- Recorrer un array con JavaScript usando while<\/h2>\n
El while tambi\u00e9n se puede utilizar para recorrer un arreglo o repetir c\u00f3digo en x ocasiones.<\/p>\n
<\/a>Source code<\/a><\/td><\/a> <\/a> <\/a> <\/td><\/tr><\/table><\/div>
let i =<\/span> 0<\/span>;<\/span>\nwhile<\/span> (<\/span>i <<\/span> 10)<\/span> {<\/span>\n    console.log<\/span>(<\/span>`Numero:<\/span> ${<\/span>i}<\/span>`)<\/span>;<\/span>\n    i++;<\/span>\n}<\/span><\/pre><\/div><\/div>\n
Puedes crear una variable que har\u00e1 de contador. Entre par\u00e9ntesis puedes poner la condici\u00f3n que se comprobar\u00e1 en cada iteraci\u00f3n y que determinar\u00e1 el final del bucle.<\/p>\n
En el caso del ejemplo, se estar\u00e1 ejecutando hasta que el valor de i sea menor que 10.<\/p>\n
F\u00edjate que el incremento de la variable i se ejecuta justo despu\u00e9s del c\u00f3digo que quieres repetir.<\/p>\n
3- Recorrer un array usando do while<\/h2>\n
Con el do… while el c\u00f3digo al menos se va a ejecutar una vez sin importar si la condici\u00f3n se cumple o no.<\/p>\n
<\/a>Source code<\/a><\/td><\/a> <\/a> <\/a> <\/td><\/tr><\/table><\/div>
i =<\/span> 0<\/span>;<\/span>\ndo<\/span> {<\/span>\n    console.log<\/span>(<\/span>`Numero:<\/span> ${<\/span>i}<\/span>`)<\/span>;<\/span>\n    i++;<\/span>\n}<\/span> while<\/span> (<\/span>i <<\/span> 10)<\/span>;<\/span><\/pre><\/div><\/div>\n
El c\u00f3digo es secuencial. Primero se imprime el valor de i en la consola, se incrementa la variable y, finalmente, se comprueba la condici\u00f3n.<\/p>\n
4- Recorrer un array usando forEach<\/h2>\n
Otra forma de recorrer un arreglo es utilizando lo que se conoce como un forEach.<\/p>\n
<\/a>Source code<\/a><\/td><\/a> <\/a> <\/a> <\/td><\/tr><\/table><\/div>
const<\/span> comidas =<\/span> [<\/span>'Desayunar'<\/span>,<\/span> 'Almorzar'<\/span>,<\/span> 'Comer'<\/span>,<\/span> 'Merendar'<\/span>,<\/span> 'Cenar'<\/span>]<\/span>;<\/span>\ncomidas.forEach<\/span>(<\/span>function<\/span>(<\/span>comida,<\/span> index)<\/span> {<\/span>\n    console.log<\/span>(<\/span>`${<\/span>index}<\/span> :<\/span> ${<\/span>comida}<\/span>`)<\/span>;<\/span>\n}<\/span>)<\/span>;<\/span><\/pre><\/div><\/div>\n
He creado un array con las comidas del d\u00eda y las estoy iterando con forEach para mostrar su \u00edndice y valor en consola.<\/p>\n
Esta sintaxis se ve muy limpia y, por eso, es una de mis preferidas para usarla en mis proyectos.<\/p>\n
5- Recorrer un array usando map<\/h2>\n
Otra forma de recorrer un arreglo es utilizando lo que se conoce como map que permite recorrer un arreglo de objetos.<\/p>\n
<\/a>Source code<\/a><\/td><\/a> <\/a> <\/a> <\/td><\/tr><\/table><\/div>
const<\/span> comidas =<\/span> [<\/span>\n    {<\/span>id:<\/span> 1<\/span>,<\/span> momento:<\/span> 'Desayuno'<\/span>}<\/span>,<\/span>\n    {<\/span>id:<\/span> 2<\/span>,<\/span> momento:<\/span> 'Almuerzo'<\/span>}<\/span>,<\/span>\n    {<\/span>id:<\/span> 3<\/span>,<\/span> momento:<\/span> 'Comida'<\/span>}<\/span>,<\/span>\n    {<\/span>id:<\/span> 4<\/span>,<\/span> momento:<\/span> 'Merienda'<\/span>}<\/span>,<\/span>\n    {<\/span>id:<\/span> 5<\/span>,<\/span> momento:<\/span> 'Cena'<\/span>}<\/span>,<\/span>\n]<\/span>;<\/span>\n \nconst<\/span> momentoComida =<\/span> comidas.map<\/span>(<\/span>function<\/span>(<\/span>comida)<\/span> {<\/span>\n    return<\/span> comida.momento<\/span>;<\/span>\n}<\/span>)<\/span>;<\/span>\n \nconsole.log<\/span>(<\/span>momentoComida)<\/span>;<\/span><\/pre><\/div><\/div>\n
En el c\u00f3digo anterior, he creado un arreglo con 5 objetos que estoy recorriendo con map.<\/p>\n
Si te fijas en el c\u00f3digo, podr\u00e1s darte cuenta que esta forma de iteraci\u00f3n, a diferencia del for, foreach o while, en este caso, se almacena la informaci\u00f3n para luego extraerla. No se extrae la informaci\u00f3n directamente.<\/p>\n","protected":false},"excerpt":{"rendered":"
Descubre 5 formas diferentes para recorrer un arreglo de datos con JavaScript. Recorrer un array con for, while, do while, forEach o map. C\u00f3digo de ejemplo.<\/p>\n","protected":false},"author":1,"featured_media":7562,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[38],"class_list":["post-7561","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript","tag-arrays"],"yoast_head":"\n5 formas para recorrer un array con JavaScript - Jose Aguilar Blog<\/title>\n<meta name=\"description\" content=\"Descubre 5 formas diferentes para recorrer un array con JavaScript. Recorrer un array de datos con for, while, do while, forEach o map. 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