{"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":"kodel-turbut-turetumete-naudoti-typescript","status":"publish","type":"post","link":"https:\/\/thecodest.co\/lt\/blog\/why-you-should-probably-use-typescript\/","title":{"rendered":"Kod\u0117l tur\u0117tum\u0117te (tikriausiai) naudoti Typescript"},"content":{"rendered":"

Dabartin\u0117 pad\u0117tis Ma\u0161inra\u0161tis<\/a> neatsirado i\u0161 niekur, nes \u0161i technologija gali i\u0161 ties\u0173 pagerinti m\u016bs\u0173 k\u016br\u0117j\u0173 patirt\u012f. Ai\u0161kesnis kodavimas padidina kontrol\u0119 ir nusp\u0117jamum\u0105 kodas<\/a>.
\u0160iame straipsnyje bandysiu jus \u012ftikinti naudoti Typescript.<\/p>\n\n\n\n

*- Duomenys<\/a> \u0161altinis: \"JS 2020\" b\u016bkl\u0117<\/a> ir \"Stack Overflow\" k\u016br\u0117j\u0173 apklausa 2020 m.<\/a>.<\/p>\n\n\n\n

Su\u017einokite apie klaidas anks\u010diau<\/h2>\n\n\n\n

Paprastai, kai kuriate program\u0105 JavaScript<\/a>, j\u016bs\u0173 srautas gali
atrodo taip:<\/p>\n\n\n\n

    \n
  1. Pakeiskite situacij\u0105,<\/li>\n\n\n\n
  2. Eikite \u012f program\u0117l\u0119 ir patikrinkite pakeist\u0105 dal\u012f \/ Atlikti (susijusius) bandymus.<\/li>\n\n\n\n
  3. Su\u017einokite, ar viskas gerai.<\/li>\n<\/ol>\n\n\n\n

    Naudodami \"Typescript\" galite i\u0161 tikr\u0173j\u0173 atlikti pakeitim\u0105 ir, jei yra koki\u0173 nors tipo klaida<\/strong> kode, i\u0161 karto su\u017einosite apie tai, gav\u0119 kompiliatoriaus klaidos prane\u0161im\u0105 arba IDE gr\u012f\u017etam\u0105j\u012f ry\u0161\u012f realiuoju laiku.
    \u017dinoma, \"Typescript\" kompiliatorius nei\u0161spr\u0119s vis\u0173 problem\u0173 ir ne\u012fsp\u0117s apie visas j\u016bs\u0173 klaidas, ta\u010diau jo pagalba gali b\u016bti ne\u012fkainojama.<\/p>\n\n\n\n

    Geresnis sintaks\u0117s u\u017ebaigimas IDE<\/h2>\n\n\n\n

    Tai labai paprasta. Jei naudojate geras IDE, pvz., \"WebStorm\" ar VSCode, gausite
    geresnis sintaks\u0117s u\u017ebaigimas naudojant Typescript. Galb\u016bt tai neskamba kaip did\u017eiulis k\u016br\u0117jo patirties pagerinimas, ta\u010diau galiausiai kiekvienas patobulinimas yra svarbus, nes gali pad\u0117ti sutaupyti     mus<\/a> tam tikr\u0105 laik\u0105 ir v\u0117lgi i\u0161vengti ra\u0161ybos klaidos ar klaidos. Be to, tip\u0105 ar s\u0105saj\u0105 galime apibr\u0117\u017eti vien\u0105 kart\u0105; kadangi nereikia nuolat prisiminti strukt\u016bros, galime susitelkti \u012f verslo logikos ra\u0161ym\u0105.<\/p>\n\n\n\n

    \"kodas\"<\/figure>\n\n\n\n
    \"JS<\/figure>\n\n\n\n

    Ma\u017eiau skausmingas pertvarkymas<\/h2>\n\n\n\n

    \u012esivaizduokite, kad d\u0117l kokios nors prie\u017easties turite atlikti refaktorizacij\u0105, pvz., prisijung\u0117te prie projektas<\/a> ir gaunate u\u017eduot\u012f prid\u0117ti nauj\u0105 funkcij\u0105, ta\u010diau \u0161i funkcija yra ka\u017ekaip susijusi su senesniu kodu.
    Typescriptas gali palengvinti ir padaryti tai ne taip skausminga, nes kai atliksite pakeitim\u0105 ir atsiras kita vieta, kurioje tur\u0117site atlikti kit\u0105 pakeitim\u0105, kompiliatorius jus apie tai \u012fsp\u0117s.<\/p>\n\n\n\n

    Pavyzd\u017eiui, tai gali b\u016bti pakeista funkcijos signat\u016bra, o galb\u016bt po pakeitimo
    funkcija gr\u0105\u017eins visi\u0161kai kitok\u012f tip\u0105, tod\u0117l skirsis ir gr\u0105\u017einamas tipas.<\/p>\n\n\n\n

    B\u016bkite tikresni d\u0117l kod\u0173 baz\u0117s<\/h2>\n\n\n\n

    JavaScript yra silpnai ir dinami\u0161kai tipizuotas, tod\u0117l, kai inicializuojate kintam\u0105j\u012f reik\u0161me tegul u\u017eklausa = ''<\/code> v\u0117liau, kodo k\u016brimo metu, k\u016br\u0117jas per klaid\u0105 gali padaryti k\u0105 nors neracionalaus, pvz. u\u017eklausa = true<\/code>, ir jis bus galiojantis JS<\/a> kodas.<\/p>\n\n\n\n

    Gerai para\u0161ytame kode netur\u0117t\u0173 pasitaikyti, kad kintamajam, kuris anks\u010diau buvo eilut\u0117, b\u016bt\u0173 priskirta login\u0117 reik\u0161m\u0117. Taigi paprastai toks priskyrimas su tipo pakeitimu \u012fvyksta d\u0117l klaidos.<\/p>\n\n\n\n

    Naudodami Typescript, negalime keisti kintamojo tipo, tod\u0117l, jei kintam\u0105j\u012f tegul u\u017eklausa = ''<\/code> kintamasis bus eilut\u0117<\/code> tip\u0105 ir negal\u0117sime per klaid\u0105 pakeisti jo tipo.<\/p>\n\n\n\n

    Jei norime, kad kintamasis b\u016bt\u0173 daugiau nei vieno tipo, visada tai darome ai\u0161kiai naudodami union type, pvz. eilut\u0117 | skai\u010dius<\/code>.<\/p>\n\n\n\n

    Tod\u0117l \"Typescript\" padaro m\u016bs\u0173 kod\u0105 labiau nusp\u0117jam\u0105 ir ai\u0161kesn\u012f.
    Be to, \"Typescript\" pasir\u016bpins ai\u0161kia valdymo srauto analize ir, jei yra galimyb\u0117, kad ka\u017ekas gali b\u016bti negerai, \u012fsp\u0117s jus.<\/p>\n\n\n\n

    \"kodo<\/figure>\n\n\n\n

    \u010cia pirmame pavyzdyje jei<\/code> bloko gausime klaid\u0105:<\/p>\n\n\n\n

    TS2339: tipo 'ClothingProduct' savyb\u0117 'battery' neegzistuoja'<\/code> 2 kartus, u\u017e akumuliatorius<\/code>, ir avinas<\/code> savyb\u0117s.<\/p>\n\n\n\n

    Antrajame bloke - kitaip<\/code>, gausime \u0161i\u0105 klaid\u0105 d\u0117l dydis<\/code> nuosavyb\u0117. \u017dinoma, tai tik pavyzdys, rodantis, kaip diskriminuojamos profesin\u0117s s\u0105jungos<\/a> ir valdymo srauto analiz\u0117<\/a> dirbti su Typescript, tod\u0117l su \u0161iuo kodu nedarome nieko pernelyg sud\u0117tingo.<\/p>\n\n\n\n

    Lengvas, laipsni\u0161kas per\u0117jimas i\u0161 JavaScript<\/h2>\n\n\n\n

    Galiojantis JavaScript kodas kartu yra ir galiojantis Typescript kodas, tod\u0117l galite \u017eingsnis po \u017eingsnio perkelti savo kod\u0173 baz\u0119. Paprastai \"Typescript\" grie\u017etojo re\u017eimo naudojimas yra gera praktika, ta\u010diau \u0161iuo atveju,
    turime prad\u0117ti nuo \"strict\": false<\/code> svetain\u0117je tsconfig.json<\/code> taip pat tur\u0117tume nustatyti dar 2 parinktis.<\/p>\n\n\n\n

    \"allowJs\": true, \/\/ tai leis mums naudoti .js failus, o tipas juose nebus tikrinamas\n\"skipLibCheck\": true \/\/ bus praleistas tip\u0173 tikrinimas m\u016bs\u0173 naudojamose bibliotekose<\/code><\/pre>\n\n\n\n
    Naudodamiesi \u0161iomis parinktimis galime \u017eingsnis po \u017eingsnio pereiti i\u0161 JS \u012f TS - failas po failo, tiesiog pakeisdami pl\u0117tin\u012f i\u0161 .js(x)<\/code> \u012f .ts(x)<\/code> ir \u012f failus \u012ftraukti tipus. Taikydami \u0161\u012f metod\u0105 galime i\u0161vengti \u0161imt\u0173 ar t\u016bkstan\u010di\u0173 bauginan\u010di\u0173 kompiliavimo klaid\u0173.<\/p>\n\n\n\n
    Santrauka<\/h2>\n\n\n\n
    Manau, kad tur\u0117tume naudoti Ma\u0161inra\u0161tis<\/b> taip da\u017enai, kaip galima<\/strong>, nes tai tikrai naudinga ilgalaik\u0117je perspektyvoje. Tai padeda pri\u017ei\u016br\u0117ti projektus, didina programuotoj\u0173 patirt\u012f, o m\u016bs\u0173 kod\u0173 baz\u0117 tampa ai\u0161kesn\u0117 ir patikimesn\u0117.<\/p>\n\n\n\n
    Ta\u010diau, kaip ir visada, yra i\u0161im\u010di\u0173, pvz., paprastas nukreipimo puslapis
    kai JavaScript naudojamas tik klasei perjungti arba kitu paprastu atveju, Typescript neturi prasm\u0117s.
    Be to, turime nepamir\u0161ti, kad nor\u0117dami visapusi\u0161kai i\u0161naudoti \"Typescript\" privalumus, turime i\u0161mokti juo naudotis pakankamu lygiu, o tai gali u\u017etrukti. Manau, kad tai vis tiek labai naudinga laiko investicija.<\/p>\n\n\n\n
    Skaityti daugiau:<\/strong><\/p>\n\n\n\n
    \"Ruby 3.0\". Ruby ir ma\u017eiau \u017einomi privatumo kontrol\u0117s metodai<\/a><\/p>\n\n\n\n
    Auk\u0161\u010diausios kokyb\u0117s kodas j\u016bs\u0173 SaaS projekte. Kod\u0117l tai tur\u0117t\u0173 r\u016bp\u0117ti jums kaip (ne techninio profilio) steig\u0117jui?<\/a><\/p>\n\n\n\n
    *Nuotraukos pavadinimas paimtas i\u0161 svetain\u0117s \"Know Your Meme\".<\/em><\/p>","protected":false},"excerpt":{"rendered":"
    Visi, kurie naudojasi JavaScript ekosistema, \u0161iandien \u017eino apie Typescript. Typescript yra viena m\u0117gstamiausi\u0173 technologij\u0173*, o jos naudojimas nuolat auga (naudojimo dalis padid\u0117jo nuo 52% 2018 m. iki 78% 2020 m.)*.<\/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":"\nWhy 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\/lt\/tinklarastis\/kodel-turbut-turetumete-naudoti-typescript\/\" \/>\n<meta property=\"og:locale\" content=\"lt_LT\" \/>\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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