{"id":7453,"date":"2019-09-18T12:05:17","date_gmt":"2019-09-18T12:05:17","guid":{"rendered":"https:\/\/www.jose-aguilar.com\/blog\/?p=7453"},"modified":"2019-09-20T11:02:29","modified_gmt":"2019-09-20T11:02:29","slug":"funciones-utiles-para-trabajar-con-cadenas-en-javascript","status":"publish","type":"post","link":"https:\/\/www.jose-aguilar.com\/blog\/funciones-utiles-para-trabajar-con-cadenas-en-javascript\/","title":{"rendered":"Funciones \u00fatiles para trabajar con cadenas en JavaScript"},"content":{"rendered":"<p>En este art\u00edculo vas a descubrir algunas de las funciones m\u00e1s \u00fatiles e interesantes que el lenguaje de programaci\u00f3n <strong>JavaScript<\/strong> tiene a tu disposici\u00f3n para hacerte la vida m\u00e1s f\u00e1cil en el momento de trabajar con cadenas.<\/p>\n<p>Las funciones son como una subrutina o subprograma (tambi\u00e9n llamado procedimiento o rutina) que se presenta como un subalgoritmo que puede formar parte de un algoritmo principal, el cual permite resolver una tarea espec\u00edfica.<\/p>\n<p>Las funciones son una parte imprescindible en cualquier lenguaje de programaci\u00f3n. Existen las funciones espec\u00edficas que puedes crear tu mismo a medida y las funciones que ya vienen en el lenguaje y, que puedes utilizar para tus algoritmos.<\/p>\n<p>En este art\u00edculo voy a citar y explicar mediante ejemplos el funcionamiento de algunas funciones que ya vienen en el lenguaje de programaci\u00f3n <strong>JavaScript<\/strong> y que sirven para trabajar con cadenas de texto.<\/p>\n<h3>length<\/h3>\n<p><em>length<\/em> m\u00e1s que una funci\u00f3n es una propiedad de un objeto tipo String que retorna la longitud del mismo en unidades. Esta propiedad devuelve el n\u00famero de caracteres de una cadena.<\/p>\n<p>A continuaci\u00f3n puedes ver un ejemplo pr\u00e1ctico:<\/p>\n<div id=\"wpshdo_1\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_1\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_1\"><\/a><a id=\"wpshat_1\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_1\"  onClick=\"javascript:wpsh_toggleBlock(1)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_1\" onClick=\"javascript:wpsh_code(1)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_1\" onClick=\"javascript:wpsh_print(1)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_1\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"javascript\" style=\"font-family:monospace;\">let nombre <span class=\"sy0\">=<\/span> <span class=\"st0\">'Jose'<\/span><span class=\"sy0\">;<\/span>\nconsole.<span class=\"me1\">log<\/span><span class=\"br0\">&#40;<\/span>nombre.<span class=\"me1\">length<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span> <span class=\"co1\">\/\/retorna un 4<\/span><\/pre><\/div><\/div>\n<p>En el c\u00f3digo anterior estoy definiendo una variable llamada \u00abnombre\u00bb a la que le doy el valor de \u00abJose\u00bb.<\/p>\n<p>En la consola del navegador muestro su longitud. <a href=\"https:\/\/www.jose-aguilar.com\/blog\/consola-del-navegador-para-javascript\/\" target=\"_blank\" rel=\"noopener noreferrer\">Ver m\u00e1s informaci\u00f3n sobre la consola del navegador<\/a>.<\/p>\n<h3>concat<\/h3>\n<p>La funci\u00f3n <em>concat<\/em> permite concatenar 2 cadenas. Se utiliza para combinar 2 o m\u00e1s cadenas u objetos de tipo string.<\/p>\n<p>Por ejemplo:<\/p>\n<div id=\"wpshdo_2\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_2\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_2\"><\/a><a id=\"wpshat_2\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_2\"  onClick=\"javascript:wpsh_toggleBlock(2)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_2\" onClick=\"javascript:wpsh_code(2)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_2\" onClick=\"javascript:wpsh_print(2)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_2\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"javascript\" style=\"font-family:monospace;\">let nombre <span class=\"sy0\">=<\/span> <span class=\"st0\">'Jose'<\/span><span class=\"sy0\">;<\/span>\nconsole.<span class=\"me1\">log<\/span><span class=\"br0\">&#40;<\/span>nombre.<span class=\"me1\">concat<\/span><span class=\"br0\">&#40;<\/span><span class=\"st0\">' '<\/span><span class=\"sy0\">,<\/span> <span class=\"st0\">'Aguilar'<\/span><span class=\"br0\">&#41;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span> <span class=\"co1\">\/\/retorna Jose Aguilar<\/span><\/pre><\/div><\/div>\n<p>La salida o retorno de esta llamada a la funci\u00f3n concat desde el objeto tipo String que he definido como \u00abnombre\u00bb, a su valor, le concatena una cadena vac\u00eda \u00bb \u00bb y la cadena apellido = \u00abAguilar\u00bb.<\/p>\n<p>El n\u00famero de par\u00e1metros o cadenas a concatenar es infinito.<\/p>\n<div>\n<div>\n<h3>toUpperCase<\/h3>\n<\/div>\n<\/div>\n<p>Esta funci\u00f3n puede venir genial para algunas ocasiones en las que queremos que un texto aparezca completamente en may\u00fasculas.<\/p>\n<p>Este m\u00e9todo devuelve el valor convertido en may\u00fasculas de la cadena que realiza la llamada.<\/p>\n<p>Por ejemplo:<\/p>\n<div id=\"wpshdo_3\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_3\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_3\"><\/a><a id=\"wpshat_3\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_3\"  onClick=\"javascript:wpsh_toggleBlock(3)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_3\" onClick=\"javascript:wpsh_code(3)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_3\" onClick=\"javascript:wpsh_print(3)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_3\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"javascript\" style=\"font-family:monospace;\">let nombre <span class=\"sy0\">=<\/span> <span class=\"st0\">'Jose'<\/span><span class=\"sy0\">;<\/span>\nconsole.<span class=\"me1\">log<\/span><span class=\"br0\">&#40;<\/span>nombre.<span class=\"me1\">toUpperCase<\/span><span class=\"br0\">&#40;<\/span><span class=\"br0\">&#41;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span> <span class=\"co1\">\/\/Resultado: JOSE<\/span><\/pre><\/div><\/div>\n<div>\n<h3>toLowerCase<\/h3>\n<p>Funci\u00f3n inversa a la anterior.<\/p>\n<p>En este caso, esta funci\u00f3n devuelve el valor en min\u00fasculas de la cadena que realiza la llamada.<\/p>\n<p>Por ejemplo:<\/p>\n<div id=\"wpshdo_4\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_4\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_4\"><\/a><a id=\"wpshat_4\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_4\"  onClick=\"javascript:wpsh_toggleBlock(4)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_4\" onClick=\"javascript:wpsh_code(4)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_4\" onClick=\"javascript:wpsh_print(4)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_4\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"javascript\" style=\"font-family:monospace;\">let nombre <span class=\"sy0\">=<\/span> <span class=\"st0\">'Jose'<\/span><span class=\"sy0\">;<\/span>\nconsole.<span class=\"me1\">log<\/span><span class=\"br0\">&#40;<\/span>nombre.<span class=\"me1\">toLowerCase<\/span><span class=\"br0\">&#40;<\/span><span class=\"br0\">&#41;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span> <span class=\"co1\">\/\/Resultado: jose<\/span><\/pre><\/div><\/div>\n<h3>indexOf<\/h3>\n<p>El m\u00e9todo indexOf() devuelve el \u00edndice, dentro del objeto String que realiza la llamada, de la primera ocurrencia del valor especificado.<\/p>\n<p>Por ejemplo:<\/p>\n<div id=\"wpshdo_5\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_5\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_5\"><\/a><a id=\"wpshat_5\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_5\"  onClick=\"javascript:wpsh_toggleBlock(5)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_5\" onClick=\"javascript:wpsh_code(5)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_5\" onClick=\"javascript:wpsh_print(5)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_5\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"javascript\" style=\"font-family:monospace;\">let mensaje <span class=\"sy0\">=<\/span> <span class=\"st0\">&quot;Aprendiendo JavaScript con Jose Aguilar&quot;<\/span><span class=\"sy0\">;<\/span>\nconsole.<span class=\"me1\">log<\/span><span class=\"br0\">&#40;<\/span>mensaje.<span class=\"me1\">indexOf<\/span><span class=\"br0\">&#40;<\/span><span class=\"st0\">'JavaScript'<\/span><span class=\"br0\">&#41;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span> <span class=\"co1\">\/\/Retorna 12<\/span><\/pre><\/div><\/div>\n<p><strong>substring<\/strong><\/p>\n<p>Esta funci\u00f3n devuelve un subconjunto de un objeto String.<\/p>\n<p>Por ejemplo:<\/p>\n<div id=\"wpshdo_6\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_6\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_6\"><\/a><a id=\"wpshat_6\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_6\"  onClick=\"javascript:wpsh_toggleBlock(6)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_6\" onClick=\"javascript:wpsh_code(6)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_6\" onClick=\"javascript:wpsh_print(6)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_6\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"javascript\" style=\"font-family:monospace;\">let mensaje <span class=\"sy0\">=<\/span> <span class=\"st0\">&quot;Aprendiendo JavaScript con Jose Aguilar&quot;<\/span><span class=\"sy0\">;<\/span>\nconsole.<span class=\"me1\">log<\/span><span class=\"br0\">&#40;<\/span>mensaje.<span class=\"me1\">substring<\/span><span class=\"br0\">&#40;<\/span>0<span class=\"sy0\">,<\/span>11<span class=\"br0\">&#41;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span> <span class=\"co1\">\/\/Retorna los 11 primeros caracteres<\/span><\/pre><\/div><\/div>\n<h3>slice<\/h3>\n<p>El m\u00e9todo slice() extrae una parte de una cadena.<\/p>\n<p>Por ejemplo, para coger los 3 \u00faltimos caracteres:<\/p>\n<div id=\"wpshdo_7\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_7\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_7\"><\/a><a id=\"wpshat_7\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_7\"  onClick=\"javascript:wpsh_toggleBlock(7)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_7\" onClick=\"javascript:wpsh_code(7)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_7\" onClick=\"javascript:wpsh_print(7)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_7\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"javascript\" style=\"font-family:monospace;\">let mensaje <span class=\"sy0\">=<\/span> <span class=\"st0\">&quot;Aprendiendo JavaScript con Jose Aguilar&quot;<\/span><span class=\"sy0\">;<\/span>\nconsole.<span class=\"me1\">log<\/span><span class=\"br0\">&#40;<\/span>mensaje.<span class=\"me1\">slice<\/span><span class=\"br0\">&#40;<\/span><span class=\"sy0\">-<\/span>3<span class=\"br0\">&#41;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span><\/pre><\/div><\/div>\n<p>O, para recoger los 3 primeros caracteres:<\/p>\n<div id=\"wpshdo_8\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_8\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_8\"><\/a><a id=\"wpshat_8\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_8\"  onClick=\"javascript:wpsh_toggleBlock(8)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_8\" onClick=\"javascript:wpsh_code(8)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_8\" onClick=\"javascript:wpsh_print(8)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_8\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"javascript\" style=\"font-family:monospace;\">let mensaje <span class=\"sy0\">=<\/span> <span class=\"st0\">&quot;Aprendiendo JavaScript con Jose Aguilar&quot;<\/span><span class=\"sy0\">;<\/span>\nconsole.<span class=\"me1\">log<\/span><span class=\"br0\">&#40;<\/span>mensaje.<span class=\"me1\">slice<\/span><span class=\"br0\">&#40;<\/span>0<span class=\"sy0\">,<\/span> 3<span class=\"br0\">&#41;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span><\/pre><\/div><\/div>\n<h3>split<\/h3>\n<p>Este m\u00e9todo divide un objeto de tipo String en un arreglo (vector) de cadenas mediante la separaci\u00f3n de la cadena en subcadenas.<\/p>\n<p>Por ejemplo:<\/p>\n<div id=\"wpshdo_9\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_9\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_9\"><\/a><a id=\"wpshat_9\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_9\"  onClick=\"javascript:wpsh_toggleBlock(9)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_9\" onClick=\"javascript:wpsh_code(9)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_9\" onClick=\"javascript:wpsh_print(9)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_9\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"javascript\" style=\"font-family:monospace;\">let mensaje <span class=\"sy0\">=<\/span> <span class=\"st0\">&quot;Aprendiendo JavaScript con Jose Aguilar&quot;<\/span><span class=\"sy0\">;<\/span>\nconsole.<span class=\"me1\">log<\/span><span class=\"br0\">&#40;<\/span>mensaje.<span class=\"me1\">split<\/span><span class=\"br0\">&#40;<\/span><span class=\"st0\">' '<\/span><span class=\"br0\">&#41;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span><\/pre><\/div><\/div>\n<p>Divide el mensaje mediante el espacio obteniendo el arreglo siguiente:<\/p>\n<div id=\"wpshdo_10\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_10\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_10\"><\/a><a id=\"wpshat_10\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_10\"  onClick=\"javascript:wpsh_toggleBlock(10)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_10\" onClick=\"javascript:wpsh_code(10)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_10\" onClick=\"javascript:wpsh_print(10)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_10\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"javascript\" style=\"font-family:monospace;\"><span class=\"br0\">[<\/span><span class=\"st0\">'Aprendiendo'<\/span><span class=\"sy0\">,<\/span> <span class=\"st0\">'JavaScript'<\/span><span class=\"sy0\">,<\/span> <span class=\"st0\">'con'<\/span><span class=\"sy0\">,<\/span> <span class=\"st0\">'Jose'<\/span><span class=\"sy0\">,<\/span> <span class=\"st0\">'Aguilar'<\/span><span class=\"br0\">]<\/span><\/pre><\/div><\/div>\n<h3>replace<\/h3>\n<p>La funci\u00f3n replace() busca una cadena dentro del objeto String que lo llama para reemplazarla por otra.<\/p>\n<p>Por ejemplo:<\/p>\n<div id=\"wpshdo_11\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_11\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_11\"><\/a><a id=\"wpshat_11\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_11\"  onClick=\"javascript:wpsh_toggleBlock(11)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_11\" onClick=\"javascript:wpsh_code(11)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_11\" onClick=\"javascript:wpsh_print(11)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_11\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"javascript\" style=\"font-family:monospace;\">let mensaje <span class=\"sy0\">=<\/span> <span class=\"st0\">&quot;Aprendiendo JavaScript con Jose Aguilar&quot;<\/span><span class=\"sy0\">;<\/span>\nconsole.<span class=\"me1\">log<\/span><span class=\"br0\">&#40;<\/span>mensaje.<span class=\"me1\">replace<\/span><span class=\"br0\">&#40;<\/span><span class=\"st0\">'JavaScript'<\/span><span class=\"sy0\">,<\/span> <span class=\"st0\">'PHP'<\/span><span class=\"br0\">&#41;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span><\/pre><\/div><\/div>\n<p>En este caso particular en la cadena que hay dentro de la variable <em>mensaje<\/em> se sustituye la palabra <strong>JavaScript<\/strong> por <strong>PHP<\/strong>.<\/p>\n<h3>includes<\/h3>\n<p>Este m\u00e9todo se puede utilizar para buscar un valor dentro de una cadena. Retorna true o false seg\u00fan corresponda.<\/p>\n<p>Por ejemplo:<\/p>\n<div id=\"wpshdo_12\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_12\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_12\"><\/a><a id=\"wpshat_12\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_12\"  onClick=\"javascript:wpsh_toggleBlock(12)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_12\" onClick=\"javascript:wpsh_code(12)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_12\" onClick=\"javascript:wpsh_print(12)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_12\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"javascript\" style=\"font-family:monospace;\">let mensaje <span class=\"sy0\">=<\/span> <span class=\"st0\">&quot;Aprendiendo JavaScript con Jose Aguilar&quot;<\/span><span class=\"sy0\">;<\/span>\nconsole.<span class=\"me1\">log<\/span><span class=\"br0\">&#40;<\/span>mensaje.<span class=\"me1\">includes<\/span><span class=\"br0\">&#40;<\/span><span class=\"st0\">'JavaScript'<\/span><span class=\"br0\">&#41;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span> <span class=\"co1\">\/\/Retorna true<\/span><\/pre><\/div><\/div>\n<h3>repeat<\/h3>\n<p>El m\u00e9todo repeat() construye y devuelve una nueva cadena que contiene el n\u00famero especificado de copias de la cadena en la cual fue llamada, concatenados.<\/p>\n<p>Por ejemplo:<\/p>\n<div id=\"wpshdo_13\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_13\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_13\"><\/a><a id=\"wpshat_13\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_13\"  onClick=\"javascript:wpsh_toggleBlock(13)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_13\" onClick=\"javascript:wpsh_code(13)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_13\" onClick=\"javascript:wpsh_print(13)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_13\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"javascript\" style=\"font-family:monospace;\">let mensaje <span class=\"sy0\">=<\/span> <span class=\"st0\">&quot;Aprendiendo JavaScript con Jose Aguilar&quot;<\/span><span class=\"sy0\">;<\/span>\nconsole.<span class=\"me1\">log<\/span><span class=\"br0\">&#40;<\/span>mensaje.<span class=\"me1\">repeat<\/span><span class=\"br0\">&#40;<\/span>2<span class=\"br0\">&#41;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span><\/pre><\/div><\/div>\n<p>Con este peque\u00f1o c\u00f3digo, en consola se mostrar\u00eda la frase o cadena depositada en la variable <em>mensaje<\/em> 2 veces.<\/p>\n<h3>concat<\/h3>\n<p>El m\u00e9todo concat() se utiliza para combinar dos o m\u00e1s cadenas.<\/p>\n<p>Por ejemplo:<\/p>\n<div id=\"wpshdo_14\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_14\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_14\"><\/a><a id=\"wpshat_14\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_14\"  onClick=\"javascript:wpsh_toggleBlock(14)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_14\" onClick=\"javascript:wpsh_code(14)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_14\" onClick=\"javascript:wpsh_print(14)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_14\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"java5\" style=\"font-family:monospace;\">let mensaje1 = <span class=\"st0\">&quot;Aprendiendo JavaScript. &quot;<\/span><span class=\"sy0\">;<\/span>\nlet mensaje2 = <span class=\"st0\">&quot;Aprendiendo PHP. &quot;<\/span><span class=\"sy0\">;<\/span>\nlet mensaje3 = <span class=\"st0\">''<\/span><span class=\"sy0\">;<\/span>\nconsole.<span class=\"me1\">log<\/span><span class=\"br0\">&#40;<\/span>mensaje3.<span class=\"me1\">concat<\/span><span class=\"br0\">&#40;<\/span>mensaje1, mensaje2<span class=\"br0\">&#41;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span><\/pre><\/div><\/div>\n<p>En este caso, 2 objetos tipo String son concatenados y guardados en otra cadena.<\/p>\n<h3>trim<\/h3>\n<p>Esta funci\u00f3n elimina los espacios en blanco en ambos extremos de la cadena.<\/p>\n<p>Por ejemplo:<\/p>\n<div id=\"wpshdo_15\" class=\"wp-synhighlighter-outer\"><div id=\"wpshdt_15\" class=\"wp-synhighlighter-expanded\"><table border=\"0\" width=\"100%\"><tr><td align=\"left\" width=\"80%\"><a name=\"#codesyntax_15\"><\/a><a id=\"wpshat_15\" class=\"wp-synhighlighter-title\" href=\"#codesyntax_15\"  onClick=\"javascript:wpsh_toggleBlock(15)\" title=\"Click to show\/hide code block\">Source code<\/a><\/td><td align=\"right\"><a href=\"#codesyntax_15\" onClick=\"javascript:wpsh_code(15)\" title=\"Show code only\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/code.png\" \/><\/a>&nbsp;<a href=\"#codesyntax_15\" onClick=\"javascript:wpsh_print(15)\" title=\"Print code\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/printer.png\" \/><\/a>&nbsp;<a href=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/About.html\" target=\"_blank\" title=\"Show plugin information\"><img decoding=\"async\" border=\"0\" style=\"border: 0 none\" src=\"https:\/\/www.jose-aguilar.com\/blog\/wp-content\/plugins\/wp-synhighlight\/themes\/default\/images\/info.gif\" \/><\/a>&nbsp;<\/td><\/tr><\/table><\/div><div id=\"wpshdi_15\" class=\"wp-synhighlighter-inner\" style=\"display: block;\"><pre class=\"javascript\" style=\"font-family:monospace;\"><span class=\"kw2\">var<\/span> mensaje <span class=\"sy0\">=<\/span> <span class=\"st0\">' Aprendiendo JavaScript    '<\/span><span class=\"sy0\">;<\/span>\nconsole.<span class=\"me1\">log<\/span><span class=\"br0\">&#40;<\/span>mensaje.<span class=\"me1\">trim<\/span><span class=\"br0\">&#40;<\/span><span class=\"br0\">&#41;<\/span><span class=\"br0\">&#41;<\/span><span class=\"sy0\">;<\/span> <span class=\"co1\">\/\/ 'Aprendiendo JavaScript'<\/span><\/pre><\/div><\/div>\n<p>Espero que sea de utilidad.<\/p>\n<p>\u00bfConoces alguna funci\u00f3n que crees que debe estar aqu\u00ed? Adelante, no dudes, env\u00eda tu comentario.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Descubre las funciones m\u00e1s \u00fatiles que JavaScript tiene a tu disposici\u00f3n para hacerte la vida m\u00e1s f\u00e1cil en el momento de trabajar con cadenas.<\/p>\n","protected":false},"author":1,"featured_media":7454,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[141],"class_list":["post-7453","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-javascript","tag-cadenas"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Funciones \u00fatiles para trabajar con cadenas en JavaScript - Jose Aguilar Blog<\/title>\n<meta name=\"description\" content=\"Descubre las funciones m\u00e1s \u00fatiles que JavaScript tiene a tu disposici\u00f3n para hacerte la vida m\u00e1s f\u00e1cil en el momento de trabajar con cadenas.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Funciones \u00fatiles para trabajar con cadenas en JavaScript - 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