{"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":"miks-peaksite-toenaoliselt-kasutama-typescripti","status":"publish","type":"post","link":"https:\/\/thecodest.co\/et\/blog\/why-you-should-probably-use-typescript\/","title":{"rendered":"Miks peaksite (t\u00f5en\u00e4oliselt) kasutama Typescript'i"},"content":{"rendered":"<p>Praegune positsioon <a href=\"https:\/\/thecodest.co\/et\/dictionary\/typescript-developer\/\">T\u00fc\u00fcptekst<\/a> ei tulnud t\u00fchjalt kohalt, sest see tehnoloogia on v\u00f5imeline t\u00f5esti parandama meie arendajate kogemust. Selgem koodimine suurendab kontrolli ja prognoositavust <a href=\"https:\/\/thecodest.co\/et\/dictionary\/what-is-code-refactoring\/\">kood<\/a>.<br>Selles artiklis p\u00fc\u00fcan teid veenda kasutama Typescripti.<\/p>\n\n\n\n<p>*- <a href=\"https:\/\/thecodest.co\/et\/blog\/app-data-collection-security-risks-value-and-types-explored\/\">Andmed<\/a> allikas: <a href=\"https:\/\/2020.stateofjs.com\/en-US\/technologies\/javascript-flavors\/\">JS 2020 olukord<\/a> ja <a href=\"https:\/\/insights.stackoverflow.com\/survey\/2020#most-loved-dreaded-and-wanted\">Stack Overflow Developer Survey 2020<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Leia vigadest varem teada<\/h2>\n\n\n\n<p>Tavaliselt, kui te arendate rakendust aastal <a href=\"https:\/\/thecodest.co\/et\/blog\/hire-javascript-developer\/\">JavaScript<\/a>, v\u00f5ib teie voolu<br>n\u00e4evad v\u00e4lja nii:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Tehke muudatus,<\/li>\n\n\n\n<li>Mine rakendusse ja vaata muudetud osa \/ Run (related) tests.<\/li>\n\n\n\n<li>Uurige, kas k\u00f5ik on korras.<\/li>\n<\/ol>\n\n\n\n<p>Typescriptiga saab tegelikult teha muudatuse ja kui on mingi <strong>t\u00fc\u00fcbiviga<\/strong> teie koodis, saate sellest kohe teada t\u00e4nu kompilaatori veateatele v\u00f5i IDE reaalajas saadavale tagasisidele.<br>Loomulikult ei lahenda Typescripti kompilaator k\u00f5iki probleeme ja ei hoiata teie k\u00f5igi vigade eest, kuid selle abi v\u00f5ib olla hindamatu v\u00e4\u00e4rtusega.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Parem s\u00fcntaksi t\u00e4itmine IDEs<\/h2>\n\n\n\n<p>See on v\u00e4ga lihtne. Kui te kasutate head IDE-d, nagu WebStorm v\u00f5i VSCode, siis saate<br>parem s\u00fcntaksi t\u00e4iendamine Typescriptiga. V\u00f5ib-olla ei tundu see tohutu arendajakogemuse paranemisena, kuid l\u00f5puks on iga paranemine oluline, sest see v\u00f5ib p\u00e4\u00e4sta <a href=\"https:\/\/thecodest.co\/et\/blog\/why-us-companies-are-opting-for-polish-developers\/\">us<\/a> m\u00f5nda aega ja j\u00e4llegi v\u00e4ltida tr\u00fckiviga v\u00f5i viga. Samuti saame oma t\u00fc\u00fcbi v\u00f5i liidese defineerida \u00fcks kord; kuna me ei pea alati struktuuri meeles pidama, saame keskenduda \u00e4riloogika kirjutamisele.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"\/app\/uploads\/2024\/05\/code.png\" alt=\"kood\" title=\"JS-kood\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"\/app\/uploads\/2024\/05\/js-code.png\" alt=\"JS-kood\" title=\"kood\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">V\u00e4hem valus refaktooring<\/h2>\n\n\n\n<p>Kujutage ette, et teil on vaja mingil p\u00f5hjusel refaktoorida, n\u00e4iteks liitusite te \u00fche <a href=\"https:\/\/thecodest.co\/et\/dictionary\/why-do-projects-fail\/\">projekt<\/a> ja saate \u00fclesande lisada uus funktsioon, kuid see funktsioon on kuidagi seotud vanema koodiga.<br>Typescript v\u00f5ib seda lihtsamaks ja v\u00e4hem valusaks teha, sest kui teete muudatuse ja seal on veel \u00fcks koht, kus te peate tegema teise muudatuse, siis kompilaator hoiatab teid selle eest.<\/p>\n\n\n\n<p>N\u00e4iteks - see v\u00f5ib olla muudetud funktsiooni allkiri v\u00f5i v\u00f5ib-olla p\u00e4rast muudatust, a<br>funktsioon tagastab midagi t\u00e4iesti erinevat, nii et ka tagastatav t\u00fc\u00fcp on erinev.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Olge koodibaasi suhtes kindlamad<\/h2>\n\n\n\n<p>JavaScript on n\u00f5rgalt ja d\u00fcnaamiliselt t\u00fcpiseeritud, nii et kui initsialiseerite muutuja v\u00e4\u00e4rtusega <code>let query = ''<\/code> hiljem koodis v\u00f5ib arendaja kogemata teha midagi ebaratsionaalset, n\u00e4iteks <code>p\u00e4ring = true<\/code>ja see kehtib <a href=\"https:\/\/thecodest.co\/et\/blog\/hire-vue-js-developers\/\">JS<\/a> kood.<\/p>\n\n\n\n<p>H\u00e4sti kirjutatud koodis ei tohiks muutujale, mis oli varem string, m\u00e4\u00e4rata boole'i v\u00e4\u00e4rtust. Nii et tavaliselt tuleneb see t\u00fc\u00fcbimuutusega omistamine veast.<\/p>\n\n\n\n<p>Typescript'i kasutamisel ei saa me muutuja t\u00fc\u00fcpi muuta, seega kui me teeme muutuja <code>let query = ''<\/code> muutuja, siis on see <code>string<\/code> t\u00fc\u00fcpi ja me ei saa selle t\u00fc\u00fcpi kogemata muuta.<\/p>\n\n\n\n<p>Kui me tahame lasta muutujal olla rohkem kui \u00fchte t\u00fc\u00fcpi, siis teeme seda alati selges\u00f5naliselt, kasutades liidu t\u00fc\u00fcpi, n\u00e4iteks <code>string | number<\/code>.<\/p>\n\n\n\n<p>Seet\u00f5ttu muudab Typescript meie koodi prognoositavamaks ja selgemaks.<br>Samuti hoolitseb Typescript kontrollivoogude anal\u00fc\u00fcsis eksplitsiitsuse eest ja kui on v\u00f5imalus, et midagi v\u00f5ib valesti minna, siis hoiatab ta teid.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"\/app\/uploads\/2024\/05\/code-sample.png\" alt=\"koodin\u00e4ide\" title=\"koodin\u00e4ide\"\/><\/figure>\n\n\n\n<p>Siin n\u00e4ites esimeses <code>kui<\/code> plokk saame vea:<\/p>\n\n\n\n<p><code>TS2339: Omadus 'patarei' ei eksisteeri t\u00fc\u00fcbil 'R\u00f5ivastusToode'.<\/code> 2 korda, sest <code>aku<\/code>ja <code>ram<\/code> omadused.<\/p>\n\n\n\n<p>Teises plokis - <code>else<\/code>, saame selle vea eest <code>suurus<\/code> vara. Loomulikult on see ainult n\u00e4ide, et n\u00e4idata, kuidas <a href=\"https:\/\/www.typescriptlang.org\/docs\/handbook\/2\/narrowing.html#discriminated-unions\">diskrimineeritud ameti\u00fchingud<\/a> ja <a href=\"https:\/\/www.typescriptlang.org\/docs\/handbook\/2\/narrowing.html#control-flow-analysis\">kontrollivoogude anal\u00fc\u00fcs<\/a> t\u00f6\u00f6tame Typescriptis, nii et me ei tee selle koodiga midagi liiga keerulist.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Lihtne, j\u00e4rkj\u00e4rguline \u00fcleminek JavaScript-st<\/h2>\n\n\n\n<p>Kehtiv JavaScript-kood on samal ajal kehtiv Typescript-kood, nii et saate oma koodibaasi samm-sammult \u00fcle viia. Tavaliselt on Typescriptis range re\u017eiimi kasutamine hea tava, kuid antud juhul,<br>peame alustama <code>\"strict\": false<\/code> aadressil <code>tsconfig.json<\/code> ja me peaksime seadma veel 2 v\u00f5imalust.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"javascript\" class=\"language-javascript\">\"allowJs\": true, \/\/ see lubab meil kasutada .js faile ja nende t\u00fc\u00fcpi ei kontrollita.\n\"skipLibCheck\": true \/\/ see j\u00e4tab t\u00fc\u00fcbi kontrollimise kasutatavates raamatukogudes vahele.<\/code><\/pre>\n\n\n\n<p>Nende valikute abil saame samm-sammult JS-ist TS-i \u00fcle minna - failide kaupa, muutes lihtsalt laiendit alates <code>.js(x)<\/code> aadressile <code>.ts(x)<\/code> ja t\u00fc\u00fcpide lisamine failidesse. Seda l\u00e4henemisviisi kasutades saame v\u00e4ltida sadu v\u00f5i tuhandeid hirmsaid kompileerimisvigu.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Kokkuv\u00f5te<\/h2>\n\n\n\n<p>Ma arvan, et me peaksime kasutama <b>T\u00fc\u00fcptekst<\/b> nii tihti kui <strong>v\u00f5imalik<\/strong>, sest see on pikas perspektiivis t\u00f5esti kasulik. See aitab s\u00e4ilitada projekte, suurendab arendajate kogemust ning muudab meie koodibaasi selgemaks ja usaldusv\u00e4\u00e4rsemaks.<\/p>\n\n\n\n<p>Kuid nagu alati, on ka siin erandeid - n\u00e4iteks lihtsa maandumislehe puhul v\u00f5ib<br>kus JavaScript kasutatakse ainult klassi l\u00fclitamiseks v\u00f5i muul lihtsal juhul ei ole Typescriptil m\u00f5tet.<br>Samuti peame meeles pidama, et Typescript'i t\u00e4ielikuks \u00e4rakasutamiseks tuleb \u00f5ppida seda kasutama piisaval tasemel ja see v\u00f5ib v\u00f5tta aega. Ma arvan, et see on ikkagi v\u00e4ga kasumlik investeering oma aega.<\/p>\n\n\n\n<p><strong>Loe edasi:<\/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\u00e4hemtuntud privaatsuskontrolli meetodid<\/a><\/p>\n\n\n\n<p><a href=\"https:\/\/thecodest.co\/blog\/highest-quality-code-in-your-saas-project\/\">K\u00f5rgeima kvaliteediga kood teie SaaS-projektis. Miks peaksite sellest (mittetehnilise) asutajana hoolima?<\/a><\/p>\n\n\n\n<p><em>*Tiitergraafika p\u00e4rineb veebilehelt Know Your Meme.<\/em><\/p>","protected":false},"excerpt":{"rendered":"<p>K\u00f5ik, kes kasutavad JavaScript \u00f6kos\u00fcsteemi, on t\u00e4nap\u00e4eval teadlikud Typescriptist. Typescript on \u00fcks armastatumaid tehnoloogiaid* ja selle kasutamine kasvab pidevalt (kasutusosa kasvas 52%-lt 2018. aastal 78%-ni 2020. aastal)*.<\/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=\"description\" content=\"Everyone who use JavaScript ecosystem is nowadays aware of Typescript. 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