{"id":6597,"date":"2026-04-13T11:50:42","date_gmt":"2026-04-13T11:50:42","guid":{"rendered":"http:\/\/the-codest.localhost\/dictionary\/immutable-object\/"},"modified":"2026-04-13T11:50:50","modified_gmt":"2026-04-13T11:50:50","slug":"nemenny-objekt","status":"publish","type":"dictionary","link":"https:\/\/thecodest.co\/cs\/dictionary\/immutable-object\/","title":{"rendered":"Nem\u011bnn\u00fd objekt"},"content":{"rendered":"<h1>Co je to nem\u011bnn\u00fd objekt?<\/h1>\n<p>Nem\u011bnn\u00fd objekt je objekt, kter\u00fd po vytvo\u0159en\u00ed nelze zm\u011bnit. Jin\u00fdmi slovy, jeho stav nelze po jeho instanciov\u00e1n\u00ed zm\u011bnit. Jak\u00fdkoli pokus o zm\u011bnu jeho hodnoty vede k vytvo\u0159en\u00ed nov\u00e9ho objektu s aktualizovanou hodnotou, p\u0159i\u010dem\u017e p\u016fvodn\u00ed objekt z\u016fstane nezm\u011bn\u011bn.<\/p>\n<p>Tento koncept se \u010dasto pou\u017e\u00edv\u00e1 v <a href=\"https:\/\/thecodest.co\/cs\/blog\/top-programming-languages-to-build-e-commerce\/\">programovac\u00ed jazyky<\/a> kter\u00e9 podporuj\u00ed funkcion\u00e1ln\u00ed programov\u00e1n\u00ed, jeho\u017e kl\u00ed\u010dovou vlastnost\u00ed je nem\u011bnnost. Nem\u011bnn\u00e9 objekty jsou u\u017eite\u010dn\u00e9 v situac\u00edch, kdy by se stav objektu nem\u011bl m\u011bnit, nap\u0159\u00edklad ve v\u00edcevl\u00e1knov\u00fdch prost\u0159ed\u00edch, kde soub\u011b\u017en\u00fd p\u0159\u00edstup k prom\u011bnliv\u00fdm objekt\u016fm m\u016f\u017ee v\u00e9st k z\u00e1vodn\u00edm podm\u00ednk\u00e1m a <a href=\"https:\/\/thecodest.co\/cs\/blog\/app-data-collection-security-risks-value-and-types-explored\/\">data<\/a> korupce.<\/p>\n<p>Nem\u011bnn\u00e9 objekty maj\u00ed oproti prom\u011bnliv\u00fdm objekt\u016fm n\u011bkolik v\u00fdhod. Zaprv\u00e9 jsou bezpe\u010dn\u00e9 pro vl\u00e1kna a lze je bezpe\u010dn\u011b sd\u00edlet mezi vl\u00e1kny bez nutnosti synchronizace. Za druh\u00e9 se o nich l\u00e9pe uva\u017euje, proto\u017ee jejich stav se nem\u016f\u017ee neo\u010dek\u00e1van\u011b zm\u011bnit. Zat\u0159et\u00ed je lze pou\u017e\u00edt jako kl\u00ed\u010de v syst\u00e9mu <a href=\"https:\/\/thecodest.co\/cs\/blog\/hash-to-use-or-not-to-use\/\">hash<\/a> tabulky a sady, proto\u017ee jejich hodnota hash je pevn\u00e1 a v pr\u016fb\u011bhu \u010dasu se nem\u011bn\u00ed.<\/p>\n<p>P\u0159\u00edklady nem\u011bnn\u00fdch objekt\u016f v <a href=\"https:\/\/thecodest.co\/cs\/blog\/find-the-right-java-developer-now\/\">Java<\/a> zahrnuj\u00ed String, Integer a LocalDate. Jakmile je objekt String vytvo\u0159en, nelze jeho hodnotu zm\u011bnit. Jak\u00fdkoli pokus o jej\u00ed zm\u011bnu vede k vytvo\u0159en\u00ed nov\u00e9ho objektu String s aktualizovanou hodnotou. Podobn\u011b nelze m\u011bnit hodnotu objektu Integer, jakmile byl jednou vytvo\u0159en.<\/p>\n<p>Nem\u011bnn\u00e9 objekty v\u0161ak nejsou vhodn\u00e9 pro v\u0161echny situace. V n\u011bkter\u00fdch p\u0159\u00edpadech jsou vhodn\u011bj\u0161\u00ed mutabiln\u00ed objekty, nap\u0159\u00edklad kdy\u017e je t\u0159eba \u010dasto aktualizovat stav objektu. V t\u011bchto p\u0159\u00edpadech je d\u016fle\u017eit\u00e9 zajistit synchronizaci p\u0159\u00edstupu k mutabiln\u00edm objekt\u016fm, aby se p\u0159ede\u0161lo z\u00e1vodn\u00edm podm\u00ednk\u00e1m a po\u0161kozen\u00ed dat.<\/p>\n<p>Souhrnn\u011b \u0159e\u010deno, nem\u011bnn\u00fd objekt je objekt, kter\u00fd nelze po vytvo\u0159en\u00ed upravit. Je u\u017eite\u010dn\u00fd v situac\u00edch, kdy by se stav objektu nem\u011bl m\u011bnit, nap\u0159\u00edklad ve v\u00edcevl\u00e1knov\u00fdch prost\u0159ed\u00edch. Nem\u011bnn\u00e9 objekty maj\u00ed oproti prom\u011bnliv\u00fdm objekt\u016fm n\u011bkolik v\u00fdhod, v\u010detn\u011b bezpe\u010dnosti vl\u00e1ken, snadn\u00e9 argumentace a vhodnosti pou\u017eit\u00ed jako kl\u00ed\u010de v hashovac\u00edch tabulk\u00e1ch a mno\u017ein\u00e1ch.<\/p>","protected":false},"excerpt":{"rendered":"<p>Seznamte se s nem\u011bnn\u00fdmi objekty v programov\u00e1n\u00ed: objekty, kter\u00e9 nelze po vytvo\u0159en\u00ed m\u011bnit. Mezi v\u00fdhody pat\u0159\u00ed bezpe\u010dnost vl\u00e1ken a snadn\u00e1 argumentace.<\/p>","protected":false},"template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"class_list":["post-6597","dictionary","type-dictionary","status-publish","hentry"],"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>Immutable Object - The Codest<\/title>\n<meta name=\"description\" content=\"Learn about immutable objects in programming: objects that cannot be modified once created. 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