{"id":3484,"date":"2017-12-05T06:00:15","date_gmt":"2017-12-05T04:00:15","guid":{"rendered":"http:\/\/www.glc.us.es\/~jalonso\/exercitium\/?p=3484"},"modified":"2017-12-12T08:24:15","modified_gmt":"2017-12-12T06:24:15","slug":"aplicacion-de-lista-de-funciones-a-lista-de-elementos","status":"publish","type":"post","link":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/aplicacion-de-lista-de-funciones-a-lista-de-elementos\/","title":{"rendered":"Aplicaci\u00f3n de lista de funciones a lista de elementos"},"content":{"rendered":"<p>Definir la funci\u00f3n<\/p>\n<pre lang=\"text\">\n   aplicaLista :: [a -> b] -> [a] -> [b]\n<\/pre>\n<p>tal que (aplicaLista fs xs) es la lista de los valores de las funciones de fs<br \/>\naplicadas a los correspondientes elementos de xs. Por ejemplo,<\/p>\n<pre lang=\"text\">\n   aplicaLista [(+2),(`div` 3),(*5)] [4,6,2]    ==  [6,2,10]\n   aplicaLista [(+2),(`div` 3),(*5)] [4,6,2,8]  ==  [6,2,10]\n   aplicaLista [(>2),(==3),(<5)]     [4,6,2,9]  ==  [True,False,True]\n<\/pre>\n<h4>Soluciones<\/h4>\n<pre lang=\"haskell\">\n-- 1\u00aa definici\u00f3n (por comprensi\u00f3n)\naplicaLista :: [a -> b] -> [a] -> [b]\naplicaLista fs xs =\n  [f x | (f,x) <- zip fs xs]\n\n-- 2\u00aa definici\u00f3n (por recursi\u00f3n)\naplicaLista2 :: [a -> b] -> [a] -> [b]\naplicaLista2 (f:fs) (x:xs) = f x : aplicaLista2 fs xs\naplicaLista2 _      _     = []\n\n-- 3\u00aa definici\u00f3n (por orden superior)\naplicaLista3 :: [a -> b] -> [a] -> [b]\naplicaLista3 = zipWith ($)\n<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Definir la funci\u00f3n aplicaLista :: [a -> b] -> [a] -> [b] tal que (aplicaLista fs xs) es la lista de los valores de las funciones de fs aplicadas a los correspondientes elementos de xs. Por ejemplo, aplicaLista [(+2),(`div` 3),(*5)] [4,6,2] == [6,2,10] aplicaLista [(+2),(`div` 3),(*5)] [4,6,2,8] == [6,2,10] aplicaLista [(>2),(==3),( b] -> [a] ->&#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":[8,11,6,9,76],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/3484"}],"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=3484"}],"version-history":[{"count":3,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/3484\/revisions"}],"predecessor-version":[{"id":3526,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/3484\/revisions\/3526"}],"wp:attachment":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/media?parent=3484"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/categories?post=3484"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/tags?post=3484"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}