2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Optionals yog nyob rau hauv lub hauv paus ntawm Swift thiab muaj nyob txij li thawj version ntawm Swift. Kev xaiv tus nqi tso cai rau peb sau cov lej huv nrog tib lub sijhawm saib xyuas cov txiaj ntsig tsis tau. Yog tias koj tshiab rau Swift koj yuav tsum tau siv rau cov syntax ntawm kev ntxiv cov lus nug rau cov khoom.
Swift xaiv xaiv dab tsi?
Ib qho kev xaiv hauv Swift yog qhov tseem ceeb ib qho tsis tu ncua lossis hloov pauv uas tuaj yeem tuav tus nqi LOSSIS tsis muaj nqi. Tus nqi tuaj yeem lossis tsis tuaj yeem yog nil. Nws yog denoted los ntawm append ib "?" tom qab hom tshaj tawm.
Cov teeb meem dab tsi ua qhov kev xaiv daws tau Swift?
Optionals yog Swift txoj kev daws teeb meem teeb meem ntawm kev sawv cev ntawm tus nqi thiab qhov tsis muaj nqi. Ib qho kev xaiv tau tso cai los tuav tus nqi lossis nil. Xav txog ib qho kev xaiv raws li lub thawv: nws yog muaj raws nraim ib qho nqi, los yog khoob. Thaum nws tsis muaj nqi, nws hais tias muaj nil.
Yuav ua li cas xaiv cov kev xaiv hauv Swift?
Kev xaiv hauv Swift yog qhov tseeb ntau dua li qhov cim ntawm qhov kawg ntawm hom, lawv yeej yog an enum. Qhov tseem ceeb, Int? yog tib yam li Optional, thiab nws yog siv ncaj qha nyob rau hauv lub enum. … Koj tuaj yeem teeb tsa lawv manually nrog lub enum, lossis koj tuaj yeem cia tus enum ua nws tus kheej.
Dab tsi yog qhwv thiab tshem tawm hauv Swift?
Wrapping txhais tau tias tus nqi tiag tiag yog khaws cia rau hauv cov qauv txheej txheem txheej txheem. Koj tsis tuaj yeem tau txais tus nqi ntawd (hauvcov ntaub ntawv no "moo") yam tsis muaj unwrapping nws. Nyob rau hauv Swift ntiaj teb no, nws yog ib txwm Christmas, thiab muaj ib txwm muaj tam sim no - los yog tsawg kawg yog variables - mus unwrap. Koj unwrap qhov tseem ceeb los ntawm kev ntxiv cov ntsiab lus exclamation.
Pom zoo:
Puas yog cov dab dab dab dab dab dab dab dab dab dab dab dab?
Myth: Ib tug dab tshos tsis yog neeg ncaj ncees yog tiasnws haum yog. Fact: Tu siab, qhov no yog ib lo lus tsis tseeb uas tau raug perpetuated los ntawm aversive trainers. Txawm hais tias haum rau lub caj dab kom zoo khawb rau hauv cov tawv nqaij rhiab nyob ib ncig ntawm lub caj dab, uas ua rau muaj kev puas tsuaj loj rau cov thyroid, esophagus, thiab trachea.
Nyob rau hauv cov ntsiab lus ntawm pej xeem lub tswv yim kev xaiv tsa yog dab tsi yog tus kheej xaiv?
nyob rau hauv cov ntsiab lus ntawm kev xaiv tsa pej xeem, xaiv tus kheej yog dab tsi? Raws li kev xaiv tsa rau Smart Polling, koj yog txhawj xeeb txog kev ntsuas cov pej xeem tus cwj pwm ntawm caj npab-tswj txoj cai, vim koj ntseeg tias cov pej xeem tsis tsuas muaj cov ntaub ntawv me me ntawm cov ncauj lus nyuaj no tab sis kuj tau xav.
Dab tsi yog qhov kev nrawm nrawm nrawm?
Spike Rush yog a nrawm-paced game mode. Lub sij hawm ua ntej ib puag ncig raug txo mus rau 20 vib nas this (feem ntau 30) thiab lub sijhawm ua si raug txo mus rau 80 vib nas this (feem ntau 100). Thaum cov neeg tawm tsam muaj sijhawm tsawg dua los cog, lawv kuj muaj qhov zoo ntawm txhua tus neeg ua si uas muaj qhov dav.
Dab tsi yog kev xav ntawm autonomists dab tsi yog qhov kev xav ntawm kev zoo nkauj ntawm kev coj ncaj ncees?
Kev lig kev cai, muaj ob txoj haujlwm tawm tsam kev xav txog kev coj ua raws li kev cai lij choj ntawm kev ntsuas kev ncaj ncees ntawm kev kos duab: 'kev coj ncaj ncees kev ncaj ncees Ethics lossis kev coj ncaj ncees yog ib ceg ntawm kev xav uas "
Lub hom phiaj ntawm kev taug kev hauv lub nkoj ntawm james caird yog dab tsi?
Dab tsi yog qhov taw qhia ntawm kev caij nkoj ntawm James Caird (nco ntsoov, nws yog lub nkoj cawm siav). Yuav tsum tau caij nkoj hla mus rau sab qab teb ntawm georgia kob mus rau qhov chaw nres tsheb whaling nrhiav kev pab cawm cov neeg caij nkoj uas tshuav ntawm ntxhw kob.
