{"id":3248,"date":"2020-07-13T08:52:00","date_gmt":"2020-07-13T08:52:00","guid":{"rendered":"http:\/\/the-codest.localhost\/blog\/generics-in-typescript\/"},"modified":"2026-04-24T11:39:03","modified_gmt":"2026-04-24T11:39:03","slug":"generiska-i-typscript","status":"publish","type":"post","link":"https:\/\/thecodest.co\/sv\/blog\/generics-in-typescript\/","title":{"rendered":"Generika i TypeScript"},"content":{"rendered":"<p>Generics kan anv\u00e4ndas i samband med funktioner (skapa generisk funktion), klasser (skapa generisk klass) och gr\u00e4nssnitt (skapa generiskt gr\u00e4nssnitt).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Grundl\u00e4ggande anv\u00e4ndning<\/h2>\n\n\n\n<p>Du har f\u00f6rmodligen anv\u00e4nt generics tidigare utan att veta om det - den vanligaste anv\u00e4ndningen av generics \u00e4r att deklarera en array:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"typescript\" class=\"language-typescript\">const myArray: str\u00e4ng[];<\/code><\/pre>\n\n\n\n<p>Det \u00e4r inte s\u00e5 speciellt vid f\u00f6rsta anblicken, vi f\u00f6rklarar bara <code>myArray<\/code> som en array av str\u00e4ngar, men det \u00e4r samma sak som en generisk deklaration:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"typescript\" class=\"language-typescript\">konst myArray: Array;<\/code><\/pre>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Att h\u00e5lla saker och ting tydliga<\/h2>\n\n\n\n<p>L\u00e5t oss b\u00f6rja med ett mycket enkelt exempel - hur skulle vi kunna porta denna vanilj <a href=\"https:\/\/thecodest.co\/sv\/blog\/hire-vue-js-developers\/\">JS<\/a> funktion till <a href=\"https:\/\/thecodest.co\/sv\/dictionary\/typescript-developer\/\">TypeScript<\/a>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"typescript\" class=\"language-typescript\">funktion getPrefiledArray(fyllmedel, l\u00e4ngd) {\n    return (new Array(length)).fill(filler);\n}<\/code><\/pre>\n\n\n\n<p>Denna funktion returnerar en array fylld med en given m\u00e4ngd <code>fyllnadsmedel<\/code>, s\u00e5 <code>l\u00e4ngd<\/code> kommer att vara <code>antal<\/code> och hela funktionen kommer att returnera en array av <code>fyllnadsmedel<\/code> - men vad \u00e4r fyllnadsmedel? I det h\u00e4r l\u00e4get kan det vara vad som helst, s\u00e5 ett alternativ \u00e4r att anv\u00e4nda <code>n\u00e5gon<\/code>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"typescript\" class=\"language-typescript\">function getPrefiledArray(filler: valfri, length: nummer): valfri[] {\n    return (new Array(length)).fill(filler);\n}<\/code><\/pre>\n\n\n\n<p>Anv\u00e4nda <code>n\u00e5gon<\/code> \u00e4r f\u00f6rvisso generisk - vi kan skicka bokstavligen vad som helst, s\u00e5 \"arbeta med ett antal typer ist\u00e4llet f\u00f6r en enda typ\" fr\u00e5n definitionen t\u00e4cks helt, men vi f\u00f6rlorar kopplingen mellan <code>fyllnadsmedel<\/code> och returtyp. I det h\u00e4r fallet vill vi returnera en gemensam sak, och vi kan uttryckligen definiera denna gemensamma sak som <strong>typ parameter<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"typescript\" class=\"language-typescript\">function getPrefiledArray(fyllning: T, l\u00e4ngd: tal): T[] {\n    return (new Array(length)).fill(filler);\n}<\/code><\/pre>\n\n\n\n<p>och anv\u00e4nda s\u00e5 h\u00e4r:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"typescript\" class=\"language-typescript\">const prefilledArray = getPrefiledArray(0, 10);<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Generiska begr\u00e4nsningar<\/h2>\n\n\n\n<p>L\u00e5t oss titta p\u00e5 andra, f\u00f6rmodligen vanligare fall. Varf\u00f6r anv\u00e4nder vi egentligen typer i funktioner? F\u00f6r mig \u00e4r det f\u00f6r att s\u00e4kerst\u00e4lla att argument som skickas till funktionen har n\u00e5gra egenskaper som jag vill interagera med.<\/p>\n\n\n\n<p>L\u00e5t oss \u00e4n en g\u00e5ng f\u00f6rs\u00f6ka porta en enkel vanilj-JS-funktion till TS.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"typescript\" class=\"language-typescript\">funktion getLength(sak) {\n    returnerar thing.length;\n}<\/code><\/pre>\n\n\n\n<p>Vi har en icke-trivial g\u00e5ta - hur kan vi s\u00e4kerst\u00e4lla att saken har en <code>l\u00e4ngd<\/code> egendom, och f\u00f6rsta tanken kan vara att g\u00f6ra n\u00e5got liknande:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"typescript\" class=\"language-typescript\">function getLength(thing: typeof Array):number {\n    return thing.length;\n}<\/code><\/pre>\n\n\n\n<p>och beroende p\u00e5 sammanhanget kan det vara korrekt, men \u00f6verlag \u00e4r vi lite generiska - det fungerar med matriser av flera typer, men vad h\u00e4nder om vi inte riktigt vet om saken alltid ska vara en matris - kanske \u00e4r saken en fotbollsplan eller ett bananskal? I det h\u00e4r fallet m\u00e5ste vi samla de gemensamma egenskaperna hos den saken i en konstruktion som kan definiera egenskaper hos ett objekt - ett gr\u00e4nssnitt:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"typescript\" class=\"language-typescript\">gr\u00e4nssnitt ITingWithLength {\n  l\u00e4ngd: nummer;\n}<\/code><\/pre>\n\n\n\n<p>Vi kan anv\u00e4nda <code>ITingMedL\u00e4ngd<\/code> gr\u00e4nssnitt som typ av <code>sak<\/code> parameter:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"typescript\" class=\"language-typescript\">function getLength(thing: IThingWithLength):number {\n    return thing.length;\n}<\/code><\/pre>\n\n\n\n<p>i det h\u00e4r enkla exemplet kommer det att vara helt okej, men om vi vill beh\u00e5lla den h\u00e4r typen generisk och inte m\u00f6ta problemet fr\u00e5n det f\u00f6rsta exemplet kan vi anv\u00e4nda <strong>Generiska begr\u00e4nsningar<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"typescript\" class=\"language-typescript\">function getLength(thing: T):number {\n    return thing.length;\n}<\/code><\/pre>\n\n\n\n<p>och anv\u00e4nda den:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"typescript\" class=\"language-typescript\">gr\u00e4nssnitt IBananaPeel {\n  tjocklek: antal;\n  l\u00e4ngd: nummer;\n}\n\nconst bananaPeel: IBananaPeel = {tjocklek: 0,2, l\u00e4ngd: 3,14};\ngetLength(bananaPeel);<\/code><\/pre>\n\n\n\n<p>Anv\u00e4nda <code>f\u00f6rl\u00e4nger<\/code> s\u00e4kerst\u00e4ller att <code>T<\/code> kommer att inneh\u00e5lla egenskaper som definieras av <code>ITingMedL\u00e4ngd<\/code>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Generiska klasser<\/h2>\n\n\n\n<p>Fram till nu har vi arbetat med generiska funktioner, men det \u00e4r inte det enda st\u00e4llet d\u00e4r generiska funktioner \u00e4r bra, l\u00e5t oss se hur vi kan inf\u00f6rliva dem i klasser.<\/p>\n\n\n\n<p>F\u00f6rst och fr\u00e4mst ska vi f\u00f6rs\u00f6ka lagra ett g\u00e4ng bananer i banankorgen:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"typescript\" class=\"language-typescript\">klass Banana {\n  konstrukt\u00f6r(\n    publik l\u00e4ngd: tal,\n    publik f\u00e4rg: str\u00e4ng,\n    publik joniserande str\u00e5lning: tal\n  ) {}\n}\n\nklass BananaBasket {\n  private bananas: Banana[] = [];\n\n  add(banana: Banana): void {\n    this.bananas.push(banana);\n  }\n}\n\nconst bananaBasket = new BananaBasket();\nbananaBasket.add(new Banana(3.14, 'red', 10e-7));<\/code><\/pre>\n\n\n\n<p>L\u00e5t oss nu f\u00f6rs\u00f6ka skapa en korg f\u00f6r allm\u00e4nna \u00e4ndam\u00e5l, f\u00f6r olika saker med samma typ:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"typescript\" class=\"language-typescript\">klass Korg {\n  privat stuff: T[] = [];\n\n  add(sak: T): void {\n    this.stuff.push(sak);\n  }\n}\n\nconst bananaBasket = new Basket();<\/code><\/pre>\n\n\n\n<p>Och slutligen, l\u00e5t oss anta att v\u00e5r korg \u00e4r en beh\u00e5llare f\u00f6r radioaktivt material och att vi bara kan f\u00f6rvara material som har <code>joniserande str\u00e5lning<\/code> egendom:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"typescript\" class=\"language-typescript\">gr\u00e4nssnitt IRadioaktiv {\n  joniserande str\u00e5lning: nummer;\n}\n\nklass RadioactiveContainer {\n  privat stuff: T[] = [];\n\n  add(sak: T): void {\n    this.stuff.push(sak);\n  }\n}<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\">Generiskt gr\u00e4nssnitt<\/h2>\n\n\n\n<p>L\u00e5t oss slutligen f\u00f6rs\u00f6ka samla all v\u00e5r kunskap och bygga ett radioaktivt imperium ocks\u00e5 med hj\u00e4lp av generiska gr\u00e4nssnitt:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"typescript\" class=\"language-typescript\">\/\/ Definiera gemensamma attribut f\u00f6r beh\u00e5llare\ngr\u00e4nssnitt IRadioaktiv {\n  joniserande str\u00e5lning: nummer;\n}\n\n\n\/\/ Definiera n\u00e5got som \u00e4r radioaktivt\ngr\u00e4nssnitt IBanana ut\u00f6kar IRadioaktiv {\n  l\u00e4ngd: nummer;\n  f\u00e4rg: str\u00e4ng;\n}\n\n\/\/ Definiera n\u00e5got som inte \u00e4r radioaktivt\ngr\u00e4nssnitt IDog {\n  vikt: nummer;\n}\n\n\/\/ Definiera gr\u00e4nssnitt f\u00f6r beh\u00e5llare som bara kan inneh\u00e5lla radioaktiva saker\ngr\u00e4nssnitt IRadioactiveContainer {\n  add(thing: T): void;\n  getRadioactiveness():tal;\n}\n\n\/\/ Definiera klass som implementerar gr\u00e4nssnittet f\u00f6r radioaktiva beh\u00e5llare\nclass RadioactiveContainer implementerar IRadioactiveContainer {\n  privat stuff: T[] = [];\n\n  add(sak: T): void {\n    this.stuff.push(sak);\n  }\n\n  getRadioactiveness(): tal {\n      return this.stuff.reduce((a, b) =&gt; a + b.joniserande str\u00e5lning, 0)\n  }\n}\n\n\/\/ FEL! Typen 'IDog' uppfyller inte begr\u00e4nsningen 'IRadioactive'\n\/\/ Och det \u00e4r ganska brutalt att f\u00f6rvara hundar i en radioaktiv beh\u00e5llare\nconst dogsContainer = new RadioactiveContainer();\n\n\/\/ Allt bra fam!\nconst radioactiveContainer = new RadioactiveContainer();\n\n\/\/ Kom ih\u00e5g att sortera ditt radioaktiva avfall - skapa en separat beh\u00e5llare endast f\u00f6r bananer\nconst bananasContainer = new RadioactiveContainer();<\/code><\/pre>\n\n\n\n<p>Det var allt, gott folk!<\/p>","protected":false},"excerpt":{"rendered":"<p>Generics ger \u00e5teranv\u00e4ndbara kodbitar som fungerar med ett antal typer i st\u00e4llet f\u00f6r en enda typ. Generics g\u00f6r det m\u00f6jligt att behandla typen som en variabel och ange den vid anv\u00e4ndning, p\u00e5 samma s\u00e4tt som funktionsparametrar.<\/p>","protected":false},"author":2,"featured_media":3249,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[8],"tags":[],"class_list":["post-3248","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software-development"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Generics in TypeScript - The Codest<\/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:\/\/thecodest.co\/sv\/blogg\/generiska-i-typscript\/\" \/>\n<meta property=\"og:locale\" content=\"sv_SE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Generics in TypeScript\" \/>\n<meta property=\"og:description\" content=\"Generics provide reusable bits of code that work with a number of types instead of a single type. 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