{"id":6667,"date":"2026-04-13T11:50:46","date_gmt":"2026-04-13T11:50:46","guid":{"rendered":"http:\/\/the-codest.localhost\/dictionary\/ternary-operator\/"},"modified":"2026-04-13T11:50:50","modified_gmt":"2026-04-13T11:50:50","slug":"ternarni-operator","status":"publish","type":"dictionary","link":"https:\/\/thecodest.co\/cs\/dictionary\/ternary-operator\/","title":{"rendered":"Tern\u00e1rn\u00ed oper\u00e1tor"},"content":{"rendered":"

Tern\u00e1rn\u00ed oper\u00e1tor<\/h1>\n

T\u0159\u00edslo\u017ekov\u00fd oper\u00e1tor, zn\u00e1m\u00fd tak\u00e9 jako podm\u00edn\u011bn\u00fd oper\u00e1tor, je zkr\u00e1cen\u00fd zp\u016fsob z\u00e1pisu p\u0159\u00edkazu if-else na jedin\u00e9m \u0159\u00e1dku. k\u00f3d<\/a>. P\u0159ij\u00edm\u00e1 t\u0159i operandy: podm\u00ednku, hodnotu, kter\u00e1 se m\u00e1 vr\u00e1tit, pokud je podm\u00ednka pravdiv\u00e1, a hodnotu, kter\u00e1 se m\u00e1 vr\u00e1tit, pokud je podm\u00ednka nepravdiv\u00e1. Syntaxe tern\u00e1rn\u00edho oper\u00e1toru je n\u00e1sleduj\u00edc\u00ed:<\/p>\n

condition ? value_if_true : value_if_false<\/code><\/p>\n

Nejprve se vyhodnot\u00ed podm\u00ednka. Pokud je pravdiv\u00e1, je vr\u00e1cen v\u00fdraz value_if_true. Pokud je nepravdiv\u00e1, je vr\u00e1cen v\u00fdraz value_if_false. Tern\u00e1rn\u00ed oper\u00e1tor se \u010dasto pou\u017e\u00edv\u00e1 jako stru\u010dn\u011bj\u0161\u00ed alternativa k p\u0159\u00edkazu if-else v situac\u00edch, kdy je podm\u00ednka jednoduch\u00e1 a v\u00fdsledn\u00fd k\u00f3d je snadno \u010diteln\u00fd.<\/p>\n

Vezm\u011bme si nap\u0159\u00edklad n\u00e1sleduj\u00edc\u00ed p\u0159\u00edkaz if-else:<\/p>\n

if (x > 0) { y = x; } else { y = -x; }<\/code><\/p>\n

To lze p\u0159epsat pomoc\u00ed tern\u00e1rn\u00edho oper\u00e1toru takto:<\/p>\n

y = (x > 0) ? x : -x;<\/code><\/p>\n

Tern\u00e1rn\u00ed oper\u00e1tor lze tak\u00e9 vno\u0159it a zpracovat tak slo\u017eit\u011bj\u0161\u00ed podm\u00ednky. Nap\u0159\u00edklad:<\/p>\n

result = (x > 0) ? \"Kladn\u00fd\" : (x < 0) ? "Z\u00e1porn\u00fd" : "Nula";<\/code><\/p>\n

Tento k\u00f3d zkontroluje, zda je x v\u011bt\u0161\u00ed ne\u017e 0. Pokud ano, vr\u00e1t\u00ed se hodnota \"Kladn\u00e1\". Pokud ne, k\u00f3d zkontroluje, zda je x men\u0161\u00ed ne\u017e 0. Pokud je, vr\u00e1t\u00ed se hodnota \"Z\u00e1porn\u00e1\". Pokud x nen\u00ed ani v\u011bt\u0161\u00ed, ani men\u0161\u00ed ne\u017e 0, je vr\u00e1cena hodnota \"nula\".<\/p>\n

Zat\u00edmco tern\u00e1rn\u00ed oper\u00e1tor m\u016f\u017ee v n\u011bkter\u00fdch p\u0159\u00edpadech u\u010dinit k\u00f3d stru\u010dn\u011bj\u0161\u00edm a p\u0159ehledn\u011bj\u0161\u00edm, p\u0159i nadm\u011brn\u00e9m nebo nevhodn\u00e9m pou\u017eit\u00ed m\u016f\u017ee tak\u00e9 zt\u00ed\u017eit jeho pochopen\u00ed. Je d\u016fle\u017eit\u00e9 pou\u017e\u00edvat tern\u00e1rn\u00ed oper\u00e1tor uv\u00e1\u017eliv\u011b a up\u0159ednostnit p\u0159ehlednost a udr\u017eovatelnost k\u00f3du p\u0159ed stru\u010dnost\u00ed.<\/p>","protected":false},"excerpt":{"rendered":"

Seznamte se s tern\u00e1rn\u00edm oper\u00e1torem, zkr\u00e1cen\u00fdm zp\u016fsobem z\u00e1pisu p\u0159\u00edkaz\u016f if-else na jednom \u0159\u00e1dku k\u00f3du. Pou\u017e\u00edvejte jej s rozmyslem pro stru\u010dn\u00fd a \u010diteln\u00fd k\u00f3d.<\/p>","protected":false},"template":"","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"class_list":["post-6667","dictionary","type-dictionary","status-publish","hentry"],"acf":[],"yoast_head":"\nTernary Operator - The Codest<\/title>\n<meta name=\"description\" content=\"Learn about the ternary operator, a shorthand way of writing if-else statements in a single line of code. 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