{"id":7259,"date":"2022-08-22T06:00:49","date_gmt":"2022-08-22T04:00:49","guid":{"rendered":"http:\/\/www.glc.us.es\/~jalonso\/exercitium\/?p=7259"},"modified":"2022-12-14T16:48:16","modified_gmt":"2022-12-14T14:48:16","slug":"interior-de-una-lista","status":"publish","type":"post","link":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/interior-de-una-lista\/","title":{"rendered":"Interior de una lista"},"content":{"rendered":"<p>Definir la funci\u00f3n<\/p>\n<pre lang=\"text\">\n   interior :: [a] -> [a]\n<\/pre>\n<p>tal que <code>(interior xs)<\/code> es la lista obtenida eliminando los extremos de la lista <code>xs<\/code>. Por ejemplo,<\/p>\n<pre lang=\"text\">\n   interior [2,5,3,7,3]  ==  [5,3,7]\n   interior [2..7]       ==  [3,4,5,6]\n<\/pre>\n<p><b>Soluciones<\/b><\/p>\n<p>A continuaci\u00f3n se muestran las <a href=\"#haskell\">soluciones en Haskell<\/a> y las <a href=\"#python\">soluciones en Python<\/a>.<\/p>\n<p><a name=\"haskell\"><\/a><br \/>\n<b>Soluciones en Haskell<\/b><\/p>\n<pre lang=\"haskell\">\ninterior :: [a] -> [a]\ninterior xs = tail (init xs)\n<\/pre>\n<p>El c\u00f3digo se encuentra en <a href=\"https:\/\/github.com\/jaalonso\/Exercitium\/blob\/main\/src\/Interior_de_una_lista.hs\">GitHub<\/a>.<\/p>\n<p><a name=\"python\"><\/a><br \/>\n<b>Soluciones en Python<\/b><\/p>\n<pre lang=\"python\">\nfrom typing import TypeVar\nfrom hypothesis import given, strategies as st\n\nA = TypeVar('A')\n\n# 1\u00aa soluci\u00f3n\ndef interior1(xs: list[A]) -> list[A]:\n    return xs[1:][:-1]\n\n# 2\u00aa soluci\u00f3n\ndef interior2(xs: list[A]) -> list[A]:\n    return xs[1:-1]\n\n# La propiedad de equivalencia es\n@given(st.lists(st.integers()))\ndef test_triangular(xs):\n    assert interior1(xs) == interior2(xs)\n\n# La comprobaci\u00f3n es\n#    src> poetry run pytest -q interior_de_una_lista.py\n#    1 passed in 0.21s\n<\/pre>\n<p>El c\u00f3digo se encuentra en <a href=\"https:\/\/github.com\/jaalonso\/Exercitium-Python\/blob\/main\/src\/interior_de_una_lista.py\">GitHub<\/a>.<\/p>\n<p><b>Comentarios<\/b><\/p>\n<ul>\n<li>Los elementos iniciales de una lista <code>xs<\/code> se calcula\n<ul>\n<li>en Haskell, con <code>init xs<\/code> y<\/li>\n<li>en Python, con <code>xs[:-1]<\/code>.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Definir la funci\u00f3n interior :: [a] -> [a] tal que (interior xs) es la lista obtenida eliminando los extremos de la lista xs. Por ejemplo, interior [2,5,3,7,3] == [5,3,7] interior [2..7] == [3,4,5,6] Soluciones A continuaci\u00f3n se muestran las soluciones en Haskell y las soluciones en Python. Soluciones en Haskell interior :: [a] -> [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":[581],"tags":[],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/7259"}],"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=7259"}],"version-history":[{"count":4,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/7259\/revisions"}],"predecessor-version":[{"id":7709,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/posts\/7259\/revisions\/7709"}],"wp:attachment":[{"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/media?parent=7259"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/categories?post=7259"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.glc.us.es\/~jalonso\/exercitium\/wp-json\/wp\/v2\/tags?post=7259"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}