{"id":7568,"date":"2020-09-09T11:36:22","date_gmt":"2020-09-09T09:36:22","guid":{"rendered":"https:\/\/www.iprog.it\/blog\/?p=7568"},"modified":"2020-09-09T11:36:22","modified_gmt":"2020-09-09T09:36:22","slug":"functional-optics-lens-e-prism","status":"publish","type":"post","link":"https:\/\/www.iprog.it\/blog\/swift\/functional-optics-lens-e-prism\/","title":{"rendered":"Functional optics: Lens e Prism"},"content":{"rendered":"<p><a href=\"https:\/\/www.iprog.it\/blog\/?attachment_id=7570\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7570\" src=\"https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Zrzut-ekranu-2019-02-15-o-11.34.21-1030x617.png\" alt=\"\" width=\"1030\" height=\"617\" srcset=\"https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Zrzut-ekranu-2019-02-15-o-11.34.21-1030x617.png 1030w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Zrzut-ekranu-2019-02-15-o-11.34.21-1030x617-300x180.png 300w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Zrzut-ekranu-2019-02-15-o-11.34.21-1030x617-620x371.png 620w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Zrzut-ekranu-2019-02-15-o-11.34.21-1030x617-768x460.png 768w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Zrzut-ekranu-2019-02-15-o-11.34.21-1030x617-940x563.png 940w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Zrzut-ekranu-2019-02-15-o-11.34.21-1030x617-624x374.png 624w\" sizes=\"auto, (max-width: 1030px) 100vw, 1030px\" \/><\/a><\/p>\n<p>Lens e Prism ci consentono di stabilire una sorta di relazione tra strutture dati, in particolare <strong>Lens<\/strong> ci consente di focalizzarci e agire su una parte specifica di tale struttura dati come ad esempio effettuando un &#8220;set&#8221; o un &#8220;get&#8221; su tale parte della struttura dati.<\/p>\n<p>Per definire un <strong>Lens<\/strong> dal tipo A, che contiene istanze dei tipi B e C\u00a0 abbiamo bisogno di due funzioni:<\/p>\n<ul>\n<li>una funzione\u00a0 get che ha come input A, tale funzione ci restituir\u00e0 una B<\/li>\n<li>una funzione set che, dato B, restituir\u00e0 una funzione di trasformazione per A, cio\u00e8 una funzione di tipo (A) -&gt; A.<\/li>\n<\/ul>\n<pre><span class=\"pl-k\">struct<\/span> <span class=\"pl-en\">Lens<\/span>&lt;<span class=\"pl-c1\">Whole<\/span>,<span class=\"pl-c1\">Part<\/span>&gt; {\r\n  <span class=\"pl-k\">let<\/span> <span class=\"pl-k\">get<\/span><span class=\"pl-k\">:<\/span> (Whole) <span class=\"pl-k\">-&gt;<\/span> Part\r\n  <span class=\"pl-k\">let<\/span> <span class=\"pl-k\">set<\/span><span class=\"pl-k\">:<\/span> (Part) <span class=\"pl-k\">-&gt;<\/span> (Whole) <span class=\"pl-k\">-&gt;<\/span> Whole\r\n}<\/pre>\n<p>In Swift gia&#8217; abbiamo questo pattern integrato di default ovvero i keypath.<\/p>\n<p><strong>Prism<\/strong> e&#8217; concettualmente molto simile a Lens ma con la differenza che quest&#8217;ultimo in Swift e&#8217; rappresentato tramite enum.<\/p>\n<p>Possiamo definire un <strong>Prism<\/strong> da D (un enum) a F (il tipo associato a uno dei suoi casi). anche qui abbiamo 2 funzioni:<\/p>\n<ul>\n<li>una funzione tryGet che ha come input un enum D e <strong>cerca<\/strong> di restituire una F, ho ho detto &#8220;cerca&#8221; perch\u00e9 una F pu\u00f2 essere recuperata solo se l&#8217;istanza D e&#8217; presente nel caso giusto.<\/li>\n<li>una funzione inject che data una F possiamo ricostruire completamente una D tramite la funzione case<\/li>\n<\/ul>\n<pre><span class=\"pl-k\">struct<\/span> <span class=\"pl-en\">Prism<\/span>&lt;<span class=\"pl-c1\">Whole<\/span>,<span class=\"pl-c1\">Part<\/span>&gt; {\r\n  <span class=\"pl-k\">let<\/span> tryGet<span class=\"pl-k\">:<\/span> (Whole) <span class=\"pl-k\">-&gt;<\/span> Part<span class=\"pl-k\">?<\/span>\r\n  <span class=\"pl-k\">let<\/span> inject<span class=\"pl-k\">:<\/span> (Part) <span class=\"pl-k\">-&gt;<\/span> Whole\r\n}<\/pre>\n<p>A questo punto passiamo ad un esempio basilare di prism e lens.<\/p>\n<p>Per prima cosa definiamo Prism e Lens<\/p>\n<p><a href=\"https:\/\/www.iprog.it\/blog\/?attachment_id=7575\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7575\" src=\"https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-16.38.56.png\" alt=\"\" width=\"518\" height=\"228\" srcset=\"https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-16.38.56.png 518w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-16.38.56-300x132.png 300w\" sizes=\"auto, (max-width: 518px) 100vw, 518px\" \/><\/a><\/p>\n<p><a href=\"https:\/\/www.iprog.it\/blog\/?attachment_id=7576\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7576\" src=\"https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-16.40.17.png\" alt=\"\" width=\"476\" height=\"224\" srcset=\"https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-16.40.17.png 476w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-16.40.17-300x141.png 300w\" sizes=\"auto, (max-width: 476px) 100vw, 476px\" \/><\/a><\/p>\n<p>Dopodiche&#8217; definiamo tramite una struct il nostro model Company (che rappresenta un azienda) quindi poiche&#8217; e&#8217; una struct possiamo utilizzare lens per accedere alla struttura typology<\/p>\n<p><a href=\"https:\/\/www.iprog.it\/blog\/?attachment_id=7572\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7572\" src=\"https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-16.36.39.png\" alt=\"\" width=\"800\" height=\"854\" srcset=\"https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-16.36.39.png 800w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-16.36.39-300x320.png 300w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-16.36.39-620x662.png 620w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-16.36.39-768x820.png 768w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-16.36.39-624x666.png 624w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/a><\/p>\n<p>Ora definiamo un enum per il JobStatus<\/p>\n<p><a href=\"https:\/\/www.iprog.it\/blog\/?attachment_id=7577\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7577\" src=\"https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-17.03.08.png\" alt=\"\" width=\"199\" height=\"108\" \/><\/a><\/p>\n<p><a href=\"https:\/\/www.iprog.it\/blog\/?attachment_id=7578\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7578\" src=\"https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-17.03.44.png\" alt=\"\" width=\"639\" height=\"465\" srcset=\"https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-17.03.44.png 639w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-17.03.44-300x218.png 300w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-17.03.44-620x451.png 620w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-17.03.44-624x454.png 624w\" sizes=\"auto, (max-width: 639px) 100vw, 639px\" \/><\/a><\/p>\n<p>Ecco un esempio d&#8217;utilizzo<\/p>\n<p><a href=\"https:\/\/www.iprog.it\/blog\/?attachment_id=7580\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-7580\" src=\"https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-17.11.51.png\" alt=\"\" width=\"1670\" height=\"524\" srcset=\"https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-17.11.51.png 1670w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-17.11.51-300x94.png 300w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-17.11.51-620x195.png 620w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-17.11.51-768x241.png 768w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-17.11.51-940x295.png 940w, https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Screenshot-2020-09-07-at-17.11.51-624x196.png 624w\" sizes=\"auto, (max-width: 1670px) 100vw, 1670px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Lens e Prism ci consentono di stabilire una sorta di relazione tra strutture dati, in particolare Lens ci consente di focalizzarci e agire su una parte specifica di tale struttura dati come ad esempio effettuando un &#8220;set&#8221; o un &#8220;get&#8221; su tale parte della struttura dati. Per definire un Lens&#8230; <a href=\"https:\/\/www.iprog.it\/blog\/swift\/functional-optics-lens-e-prism\/\">Read more &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":7570,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2234],"tags":[],"class_list":["post-7568","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-swift"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Functional optics: Lens e Prism - iProg<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.iprog.it\/blog\/swift\/functional-optics-lens-e-prism\/\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:title\" content=\"Functional optics: Lens e Prism - iProg\" \/>\n<meta name=\"twitter:description\" content=\"Lens e Prism ci consentono di stabilire una sorta di relazione tra strutture dati, in particolare Lens ci consente di focalizzarci e agire su una parte specifica di tale struttura dati come ad esempio effettuando un &#8220;set&#8221; o un &#8220;get&#8221; su tale parte della struttura dati. Per definire un Lens... Read more &raquo;\" \/>\n<meta name=\"twitter:image\" content=\"https:\/\/www.iprog.it\/blog\/wp-content\/uploads\/2020\/09\/Zrzut-ekranu-2019-02-15-o-11.34.21-1030x617.png\" \/>\n<meta name=\"twitter:creator\" content=\"@flexkid1\" \/>\n<meta name=\"twitter:site\" content=\"@iprogblog\" \/>\n<meta name=\"twitter:label1\" content=\"Scritto da\" \/>\n\t<meta name=\"twitter:data1\" content=\"Diego\" \/>\n\t<meta name=\"twitter:label2\" content=\"Tempo di lettura stimato\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minuti\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.iprog.it\\\/blog\\\/swift\\\/functional-optics-lens-e-prism\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.iprog.it\\\/blog\\\/swift\\\/functional-optics-lens-e-prism\\\/\"},\"author\":{\"name\":\"Diego\",\"@id\":\"https:\\\/\\\/www.iprog.it\\\/blog\\\/#\\\/schema\\\/person\\\/048c8acb70f8a33f1498675ab9db41a3\"},\"headline\":\"Functional optics: Lens e Prism\",\"datePublished\":\"2020-09-09T09:36:22+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.iprog.it\\\/blog\\\/swift\\\/functional-optics-lens-e-prism\\\/\"},\"wordCount\":272,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/www.iprog.it\\\/blog\\\/swift\\\/functional-optics-lens-e-prism\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/www.iprog.it\\\/blog\\\/wp-content\\\/uploads\\\/2020\\\/09\\\/Zrzut-ekranu-2019-02-15-o-11.34.21-1030x617.png\",\"articleSection\":[\"Swift\"],\"inLanguage\":\"it-IT\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\\\/\\\/www.iprog.it\\\/blog\\\/swift\\\/functional-optics-lens-e-prism\\\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/www.iprog.it\\\/blog\\\/swift\\\/functional-optics-lens-e-prism\\\/\",\"url\":\"https:\\\/\\\/www.iprog.it\\\/blog\\\/swift\\\/functional-optics-lens-e-prism\\\/\",\"name\":\"Functional optics: Lens e Prism - 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Per definire un Lens... 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