{"id":3941,"date":"2020-09-24T08:52:00","date_gmt":"2020-09-24T08:52:00","guid":{"rendered":"http:\/\/the-codest.localhost\/blog\/why-you-should-probably-use-typescript\/"},"modified":"2026-04-27T09:49:47","modified_gmt":"2026-04-27T09:49:47","slug":"miksi-sinun-pitaisi-luultavasti-kayttaa-typescriptia","status":"publish","type":"post","link":"https:\/\/thecodest.co\/fi\/blog\/why-you-should-probably-use-typescript\/","title":{"rendered":"Miksi sinun pit\u00e4isi (luultavasti) k\u00e4ytt\u00e4\u00e4 Typescripti\u00e4?"},"content":{"rendered":"<p>Nykyinen asema <a href=\"https:\/\/thecodest.co\/fi\/dictionary\/typescript-developer\/\">Kirjoitusk\u00e4sikirjoitus<\/a> ei tullut tyhj\u00e4st\u00e4, sill\u00e4 kyseinen teknologia pystyy todella parantamaan kehitt\u00e4j\u00e4kokemustamme. Selke\u00e4mpi koodaus lis\u00e4\u00e4 valvontaa ja ennustettavuutta. <a href=\"https:\/\/thecodest.co\/fi\/dictionary\/what-is-code-refactoring\/\">koodi<\/a>.<br>T\u00e4ss\u00e4 artikkelissa yrit\u00e4n vakuuttaa sinut Typescriptin k\u00e4yt\u00f6st\u00e4.<\/p>\n\n\n\n<p>*- <a href=\"https:\/\/thecodest.co\/fi\/blog\/app-data-collection-security-risks-value-and-types-explored\/\">Tiedot<\/a> l\u00e4hde: <a href=\"https:\/\/2020.stateofjs.com\/en-US\/technologies\/javascript-flavors\/\">JS 2020:n tila<\/a> ja <a href=\"https:\/\/insights.stackoverflow.com\/survey\/2020#most-loved-dreaded-and-wanted\">Stack Overflow -kehitt\u00e4j\u00e4tutkimus 2020<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Selvit\u00e4 virheet aikaisemmin<\/h2>\n\n\n\n<p>Yleens\u00e4, kun sovellusta kehitet\u00e4\u00e4n vuonna <a href=\"https:\/\/thecodest.co\/fi\/blog\/hire-javascript-developer\/\">JavaScript<\/a>, virtauksesi saattaa<br>n\u00e4ytt\u00e4\u00e4 t\u00e4lt\u00e4:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Tee muutos,<\/li>\n\n\n\n<li>Siirry sovellukseen ja tarkista muuttunut osa \/ Suorita (liittyv\u00e4t) testit.<\/li>\n\n\n\n<li>Ota selv\u00e4\u00e4, onko kaikki kunnossa.<\/li>\n<\/ol>\n\n\n\n<p>Typescriptin avulla voit itse asiassa tehd\u00e4 muutoksen, ja jos on jotain <strong>tyyppivirhe<\/strong> koodissasi, tied\u00e4t siit\u00e4 v\u00e4litt\u00f6m\u00e4sti k\u00e4\u00e4nt\u00e4j\u00e4n virheilmoituksen tai IDE:n reaaliaikaisen palautteen ansiosta.<br>Typescript-k\u00e4\u00e4nt\u00e4j\u00e4 ei tietenk\u00e4\u00e4n ratkaise kaikkia ongelmia eik\u00e4 varoita kaikista virheist\u00e4si, mutta sen apu voi olla korvaamatonta.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Parempi syntaksin t\u00e4ydent\u00e4minen IDE-ohjelmissa<\/h2>\n\n\n\n<p>Se on todella yksinkertaista. Jos k\u00e4yt\u00e4t hyvi\u00e4 IDE-ohjelmia, kuten WebStormia tai VSCodea, saat seuraavanlaisia tuloksia<br>parempi syntaksin t\u00e4ydent\u00e4minen Typescriptin kanssa. Ehk\u00e4 se ei kuulosta valtavilta parannuksilta kehitt\u00e4j\u00e4kokemukseen, mutta lopulta jokaisella parannuksella on merkityst\u00e4, sill\u00e4 se voi s\u00e4\u00e4st\u00e4\u00e4 <a href=\"https:\/\/thecodest.co\/fi\/blog\/why-us-companies-are-opting-for-polish-developers\/\">us<\/a> jonkin aikaa ja j\u00e4lleen kerran est\u00e4\u00e4 kirjoitusvirheen tai virheen. Lis\u00e4ksi voimme m\u00e4\u00e4ritell\u00e4 tyypin tai rajapinnan kerran; kun meid\u00e4n ei tarvitse aina muistaa rakennetta, voimme keskitty\u00e4 liiketoimintalogiikan kirjoittamiseen.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"\/app\/uploads\/2024\/05\/code.png\" alt=\"koodi\" title=\"JS-koodi\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"\/app\/uploads\/2024\/05\/js-code.png\" alt=\"JS-koodi\" title=\"koodi\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">V\u00e4hemm\u00e4n tuskallista refaktorointia<\/h2>\n\n\n\n<p>Kuvittele, ett\u00e4 sinun on refaktoroitava jostain syyst\u00e4, esimerkiksi, ett\u00e4 olet liittynyt yhteen <a href=\"https:\/\/thecodest.co\/fi\/dictionary\/why-do-projects-fail\/\">projekti<\/a> ja saat teht\u00e4v\u00e4ksi lis\u00e4t\u00e4 uuden ominaisuuden, mutta t\u00e4m\u00e4 ominaisuus liittyy jotenkin vanhaan koodiin.<br>Typescript voi tehd\u00e4 siit\u00e4 helpompaa ja v\u00e4hemm\u00e4n tuskallista, sill\u00e4 kun teet muutoksen ja joudut tekem\u00e4\u00e4n toisen muutoksen toisessa kohdassa, k\u00e4\u00e4nt\u00e4j\u00e4 varoittaa sinua siit\u00e4.<\/p>\n\n\n\n<p>Esimerkiksi - se voi olla muuttunut funktiosignatuuri tai ehk\u00e4 muutoksen j\u00e4lkeen, a<br>funktio palauttaa jotain t\u00e4ysin erilaista, joten my\u00f6s palautettu tyyppi on erilainen.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Enemm\u00e4n luottamusta koodipohjaan<\/h2>\n\n\n\n<p>JavaScript on heikosti ja dynaamisesti tyypitetty, joten kun alustat muuttujan arvolla <code>let query = ''<\/code> my\u00f6hemmin koodissa, kehitt\u00e4j\u00e4 voi vahingossa tehd\u00e4 jotain j\u00e4rjet\u00f6nt\u00e4, esimerkiksi <code>query = true<\/code>, ja se on voimassa <a href=\"https:\/\/thecodest.co\/fi\/blog\/hire-vue-js-developers\/\">JS<\/a> koodi.<\/p>\n\n\n\n<p>Hyvin kirjoitetussa koodissa ei pit\u00e4isi tapahtua boolean-arvon antamista muuttujalle, joka oli aiemmin merkkijono. Joten yleens\u00e4 tuo tyypinmuutoksen sis\u00e4lt\u00e4v\u00e4 osoitus johtuu virheest\u00e4.<\/p>\n\n\n\n<p>Typescripti\u00e4 k\u00e4ytett\u00e4ess\u00e4 emme voi muuttaa muuttujan tyyppi\u00e4, joten jos teemme muuttujan tyypiksi <code>let query = ''<\/code> muuttuja, se on <code>merkkijono<\/code> tyyppi\u00e4, emmek\u00e4 voi muuttaa sen tyyppi\u00e4 vahingossa.<\/p>\n\n\n\n<p>Jos haluamme antaa muuttujan olla useampaa kuin yht\u00e4 tyyppi\u00e4, teemme sen aina eksplisiittisesti k\u00e4ytt\u00e4m\u00e4ll\u00e4 union-tyyppi\u00e4, esimerkiksi seuraavasti <code>merkkijono | numero<\/code>.<\/p>\n\n\n\n<p>Siksi Typescript tekee koodistamme ennustettavampaa ja selke\u00e4mp\u00e4\u00e4.<br>Typescript huolehtii my\u00f6s kontrollivirran analyysin eksplisiittisyydest\u00e4, ja jos on mahdollista, ett\u00e4 jokin menee pieleen, se varoittaa sinua.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"\/app\/uploads\/2024\/05\/code-sample.png\" alt=\"koodin\u00e4yte\" title=\"koodin\u00e4yte\"\/><\/figure>\n\n\n\n<p>T\u00e4ss\u00e4 esimerkiss\u00e4 ensimm\u00e4isess\u00e4 <code>jos<\/code> lohko saamme virheen:<\/p>\n\n\n\n<p><code>TS2339: Ominaisuutta 'battery' ei ole olemassa tyypiss\u00e4 'ClothingProduct'.<\/code> 2 kertaa, kun <code>akku<\/code>ja <code>ram<\/code> ominaisuudet.<\/p>\n\n\n\n<p>Toisessa lohkossa - <code>else<\/code>, saamme t\u00e4m\u00e4n virheen <code>koko<\/code> omaisuus. Tietenkin se on vain esimerkki, joka osoittaa, miten... <a href=\"https:\/\/www.typescriptlang.org\/docs\/handbook\/2\/narrowing.html#discriminated-unions\">syrjityt liitot<\/a> ja <a href=\"https:\/\/www.typescriptlang.org\/docs\/handbook\/2\/narrowing.html#control-flow-analysis\">ohjausvirta-analyysi<\/a> toimii Typescriptill\u00e4, joten emme tee mit\u00e4\u00e4n liian monimutkaista koodilla.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Helppo, asteittainen siirtyminen JavaScript:st\u00e4 alkaen.<\/h2>\n\n\n\n<p>Kelvollinen JavaScript-koodi on samalla kelvollista Typescript-koodia, joten voit siirt\u00e4\u00e4 koodipohjaasi askel askeleelta. Yleens\u00e4 Typescriptin strict-tilan k\u00e4ytt\u00e4minen on hyv\u00e4 k\u00e4yt\u00e4nt\u00f6, mutta t\u00e4ss\u00e4 tapauksessa,<br>meid\u00e4n on aloitettava <code>\"strict\": false<\/code> osoitteessa <code>tsconfig.json<\/code> ja meid\u00e4n pit\u00e4isi my\u00f6s asettaa 2 muuta vaihtoehtoa.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">\"allowJs\": true, \/\/ se sallii meid\u00e4n k\u00e4ytt\u00e4\u00e4 .js-tiedostoja, eik\u00e4 tyyppi\u00e4 tarkisteta niiss\u00e4.\n\"skipLibCheck\": true \/\/ se ohittaa tyyppien tarkistamisen k\u00e4ytt\u00e4miss\u00e4mme kirjastoissa.<\/code><\/pre>\n\n\n\n<p>N\u00e4iden vaihtoehtojen avulla voimme siirty\u00e4 JS:st\u00e4 TS:\u00e4\u00e4n askel askeleelta - tiedosto kerrallaan, yksinkertaisesti vaihtamalla tiedostop\u00e4\u00e4tteen muotoon <code>.js(x)<\/code> osoitteeseen <code>.ts(x)<\/code> ja lis\u00e4\u00e4m\u00e4ll\u00e4 tyyppej\u00e4 tiedostoihin. T\u00e4t\u00e4 l\u00e4hestymistapaa k\u00e4ytt\u00e4m\u00e4ll\u00e4 voimme v\u00e4ltt\u00e4\u00e4 satoja tai tuhansia pelottavia k\u00e4\u00e4nn\u00f6svirheit\u00e4.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Yhteenveto<\/h2>\n\n\n\n<p>Mielest\u00e4ni meid\u00e4n pit\u00e4isi k\u00e4ytt\u00e4\u00e4 <b>Kirjoitusk\u00e4sikirjoitus<\/b> niin usein kuin <strong>mahdollinen<\/strong>, koska se on todella hy\u00f6dyllist\u00e4 pitk\u00e4ll\u00e4 aikav\u00e4lill\u00e4. Se auttaa yll\u00e4pit\u00e4m\u00e4\u00e4n projekteja, lis\u00e4\u00e4 kehitt\u00e4jien kokemusta ja tekee koodipohjastamme selke\u00e4mm\u00e4n ja luotettavamman.<\/p>\n\n\n\n<p>Kuten aina, on kuitenkin olemassa poikkeuksia - esimerkiksi yksinkertaisen aloitussivun osalta.<br>jossa JavaScript:t\u00e4 k\u00e4ytet\u00e4\u00e4n vain luokan vaihtamiseen tai muussa yksinkertaisessa tapauksessa Typescript ei ole j\u00e4rkev\u00e4\u00e4.<br>On my\u00f6s muistettava, ett\u00e4 Typescriptin t\u00e4ysi hy\u00f6dynt\u00e4minen edellytt\u00e4\u00e4, ett\u00e4 sit\u00e4 opitaan k\u00e4ytt\u00e4m\u00e4\u00e4n riitt\u00e4v\u00e4ll\u00e4 tasolla, ja se voi vied\u00e4 aikaa. Mielest\u00e4ni se on silti eritt\u00e4in kannattava sijoitus aikaa.<\/p>\n\n\n\n<p><strong>Lue lis\u00e4\u00e4:<\/strong><\/p>\n\n\n\n<p><a href=\"https:\/\/thecodest.co\/blog\/ruby-3-0-ruby-and-lesser-known-privacy-control-methods\/\">Ruby 3.0. Ruby ja v\u00e4hemm\u00e4n tunnetut yksityisyyden valvontamenetelm\u00e4t<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/thecodest.co\/blog\/highest-quality-code-in-your-saas-project\/\">Laadukkain koodi SaaS-projektissasi. Miksi sinun (ei-teknisen) perustajan pit\u00e4isi v\u00e4litt\u00e4\u00e4 siit\u00e4?<\/a><\/p>\n\n\n\n<p><em>*Titteligrafiikka on per\u00e4isin Know Your Meme -sivustolta.<\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>Kaikki, jotka k\u00e4ytt\u00e4v\u00e4t JavaScript-ekosysteemi\u00e4, ovat nyky\u00e4\u00e4n tietoisia Typescriptist\u00e4. Typescript on yksi rakastetuimmista teknologioista*, ja sen k\u00e4ytt\u00f6 kasvaa jatkuvasti (k\u00e4ytt\u00f6osuus kasvoi 52%:st\u00e4 vuonna 2018 78%:hen vuonna 2020)*.<\/p>","protected":false},"author":2,"featured_media":3942,"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-3941","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>Why you should (probably) use 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\/fi\/blogi\/miksi-sinun-pitaisi-luultavasti-kayttaa-typescriptia\/\" \/>\n<meta property=\"og:locale\" content=\"fi_FI\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Why you should (probably) use Typescript\" \/>\n<meta property=\"og:description\" content=\"Everyone who use JavaScript ecosystem is nowadays aware of Typescript. 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