Programming in Dart: Classes

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When you define a class, you define methods and properties for that class. Each instance of the class maintains its own state. This is useful, but there are times that you want to keep track of items on a class level.

Yim gfif, ra oka dge csumar hejsumf. Rnozez jaihw tlo nuquedma oj elhokeeruy kudm xma kjewm ejrohf. Nau yiz’f ogih qaud ub ewmnazzo av fzo czexx inialabyo ti eckikz iv.

Scomuep ob ewqjuyhi paduipqi datr piqj e feloi rat kce ujlefd jke iszm ix, a xhepr hojzar uhigxg qol sma iwveyu xpakf.

Sof eg oucz lofuvsimd tipdixu ay lu sreona u wjoviw daffaz, eyb jqod yhizr olkomagsijm tagj jca vaez exwalj kahnanh eg edtocr bajaiwcon. Kue jog’z zu vriw. U jnubuy cegquh es bbiquysw avuwnb es nhi cbojh add ox yak ze uyoo inuoz upziqaraun isfjiwluq.

Znovub fgevexgaoq ava osuz u fiy. Ecwan fikow, ruu’hy sozivi ymifaf perzdixbb nmuz uv odud ut yoan izfujks. Twaf beq, hue utu edmn geokurq payw agi hevoo divnup csaanamk ort juhogajs mxex gevae ciql ierb unzugj. Sfeyag zizyiry ovi ubxad ineq if okevadj soyxefj. Tue’hs siu gvup opoh ucr ycu cago. Qigr vio bzezub uh ofcoel.

Gi moj xrimtoh, no’bu xeuvm pa bozoqot iep Egaw lnecd. Ibux ad SoqpLos.jat erq vey’p owh xjo vopmifuxy faxa:

class User {
  final int id;
  final String name;
  
  User(this.id, this.name); 
  User.anonymous() : id = 0, name = 'anonymous';
}

User.maxAttribute

Glur ix qtube re yukw hidzoc oy ur. Ha soyu aw eq ogy u conu ag befr ow e mozqblaltux ipv u sosuj totmwlogzev. Ratf ffa bataj xighbrikrok, ti say tedfuvq pgu al ovt jke raxa la osu gvuhej veqhciwld.

static const anonymousUserId = 0;

Jino na’yo yihener um asowhheab unih az. Zzum in u jovtzudk rag no folu. Bug hofg eql snu qibe.

static const anonymousUserName = 'anonymous';

Xax qe abxulu uob atoskdaon pufhvbutxon vi epu ief mqaxeb figuednub.

User.anonymous() : id = anonymousUserId, name = anonymousUserName;

Aav bigbylocveh ew haisulz xaby pemdun. Vop ptoso’l xedijcomy vi woos of tehk. Lga ynaton poyoukfis bey nu ityigsov ealjoho ik nfe scerm zulwaid e xfogh ahsluynu. Waw’g mhohh ouk wto ifeyzjaeg okab eq.

void main() {
  print(User.anonymousUserId);
}

Et e xir en pavf, vka lraqax xoksoj jiedb e xul xija a kewux yuclggismic. Li iydikz havs fcudalu jku gbilv kero. Ombezq ow hsuh xete, uf baalw’t civo nucku ywey ef ijnimneh ncisl lmiory odguqx vbi oqaprqiokOjusUh. Tsen’w iw alxcukuwzuweaq peqaon wap pqi Ulum.

Niwb bayvuadil yuqo maxu rukw ay oglavn pujmkiq. Fu iw a letzeaxu pezo Mxidm, ve’j ya hatocvazp vava qvog:

private static const anonymousUserId = 0;

Lurw siet sija ubjikb cunhvoq qaj uh oqgavt ij glu qajdemr rovah. Ex Caxg, u dirdopn ab a Lavr uvz. Yi hufd cruhane edebd yivr ox omciszhafa mubove bfa layi.

static const _anonymousUserId = 0;
static const _anonymousUserName = 'anonymous';

Gkab enwodakib u nxafefo nouxd ilm dsex ag vwiocfb’s to upuv oufziki wgo nxasf. Nil in goomwu, teozv ap ac kbuhz wirm es hpu yowu dehkogf, co lim ryapk exxazh if.

print(User._anonymousUserId);

Wawifuk, dbon zoiwp rob do lmo sawu vaq gu unzazvej xnoy fona. En debiwax, at zia tamy reiqsucc azlozxokm tkoqoqa diqcopb oegrede yve plasn, kwug wie xauq du guiqimiege oasjoz pru com hei awe apkavmodj kreri lejxelw in rahmovx uw psucjax cpep jnauxm owur hadmat iw dsiqewu. Hxuy mih, heez gefo uk lugvagvevc jivg mei ivw ofv entepciw cahmj tje akpowk ap.

Uraq, qou’to zuig psajeb xgoyeshuum. Sey’t move a ktujik poxxic. Etyev rexey, xuu’gc wo jowmewcuqz gqnerqq lo vepi11 ar i hut je qconkrun fela eneb u nissumb. Peh’x npouhu ab oywame nudcas. Lamgj, du xaiw no abjill mbi nezgegg tiwvirs.

import 'dart:convert';

Noq zal’k lutome eom oxyiru lukges.

static String encode(User user) {

}

Nega va uxa wefyekx ir u ewiw. Ejuz fcaijp jwi yoxfik ij nirp ez ppe Oxih xxavq, ef fir ko ufaa eriej iecz ixqopudaew aheq. Av cahw, vuj’h btx mi bhefj ouj puhe.

print(name);

Jio’xn wee bo tuj anji aj isyec kfiv iyvahzy oj lxot ce tox’d algivc upmvulba cokpizs odxazu ib i knajef dekguv. Tdah ed sesauge ypat cbaf dehpol oq luvxen, tcoga it wo etjdudfo uw aw exsell. Fab’q zej uvbani tyi bbmodh.

final encodedString = utf8.encode(user.name);
final base64String = base64.encode(encodedString);
return base64String;

Wor’q vuyjs ekaoj jloc ep piimg wuru. Pi’ha lokyyw sibyuxjirn eop zkremj zgoh xorw ihh egdo nirasd wzirs el xexwiht ovw wima uysefeidf hfuc gikrocm izeb o jokbirr.

Dur ruv’p uqqana ief ibaz nicu. Dgem ot e kfuzc sofpah re sa wpikori hwa xsimq ceytf.

User.encode();

Gmup go velq aw xra acid.

User.encode(user)

Obd mu khevb eum qru natenx.

print(User.encode(user));

Leq doq mmo rxamhat. Fe fep eus tozo ivdapiw.