{"id":555,"date":"2014-11-10T07:06:42","date_gmt":"2014-11-10T05:06:42","guid":{"rendered":"http:\/\/www.glc.us.es\/~jalonso\/exercitium\/?p=555"},"modified":"2016-05-01T22:07:10","modified_gmt":"2016-05-01T20:07:10","slug":"extension-de-un-fichero","status":"publish","type":"post","link":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/extension-de-un-fichero\/","title":{"rendered":"Extensi\u00f3n de un fichero"},"content":{"rendered":"<h4>Enunciado<\/h4>\n<pre lang=\"text\">\n-- La extensi\u00f3n de un fichero es la palabra a continuaci\u00f3n del \u00faltimo\n-- punto en el nombre del fichero. Por ejemplo, la extensi\u00f3n de\n-- \"documento.txt\" es \"txt\" \n-- \n-- Definir la funci\u00f3n\n--    extension :: String -> String\n-- tal que (extension cs) es la extensi\u00f3n del fichero cs. Por ejemplo,\n--    extension \"ejercicio.hs\"       ==  \"hs\"\n--    extension \"documento.txt\"      ==  \"txt\"\n--    extension \"documento.txt.pdf\"  ==  \"pdf\"\n--    extension \"resumen\"            ==  \"\"\n<\/pre>\n<h4>Soluciones<\/h4>\n<pre lang=\"haskell\">\n-- 1\u00aa definici\u00f3n (por recursi\u00f3n):\nextension1 :: String -> String\nextension1 cs | elem '.' cs = reverse (aux (reverse cs))\n              | otherwise   = \"\"\n    where aux []       = []\n          aux ('.':cs) = []\n          aux (c:cs)   = c : aux cs\n\n-- 2\u00aa definici\u00f3n (con takeWhile):\nextension2 :: String -> String\nextension2 cs\n    | notElem '.' cs = \"\"\n    | otherwise      = reverse (takeWhile (\/= '.') (reverse cs))\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Enunciado &#8212; La extensi\u00f3n de un fichero es la palabra a continuaci\u00f3n del \u00faltimo &#8212; punto en el nombre del fichero. Por ejemplo, la extensi\u00f3n de &#8212; \u00abdocumento.txt\u00bb es \u00abtxt\u00bb &#8212; &#8212; Definir la funci\u00f3n &#8212; extension :: String -> String &#8212; tal que (extension cs) es la extensi\u00f3n del fichero cs. Por ejemplo, &#8211;&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"footnotes":"","_jetpack_memberships_contains_paid_content":false},"categories":[5],"tags":[35,46,26,134,27,11,6,32,34,9],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/555"}],"collection":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/comments?post=555"}],"version-history":[{"count":5,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/555\/revisions"}],"predecessor-version":[{"id":743,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/555\/revisions\/743"}],"wp:attachment":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/media?parent=555"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/categories?post=555"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/tags?post=555"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}