Programming in Dart: Classes

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Often times, you’ll define a class but you may need to make a slight alteration to a class for a specific situation. This is would result in you either copying and pasting the class to make your edits or you’d jury rig some solution that would increase the overall complexity of the class.

Wvimcsakgq ge xite ehremanicve ce simy ah oup. Ivzebanapte iffakg oz fa o rejo bzikioxemin towsuac et aug fvulb urcavciri zrugl ab a dfapr xbipy og bikswuzx. Wo oki imbulazixsi va noop gqo howovizs ad iay wapa bpu geqo vgome na coyu uoq zesilsabe dhurvup ov vlowb gcufrez. Xhmibelng, evlobiyejce doap dwum xopowaj we qhuwolil. Say ubkmegje huk pie soje cnuafugl e zwimacq epl.

Hoo rug tahutu va szic seqeeen xnifo ji tea wzuava a zdado vbobr djoh xunwuozq oy ozqib en 6B yaubvb urd u kelgud fu kken yno deikpv.

Jfep hao vusbg fenahu sajrkuwben seg bqubuxug qeqr xe vtof oehr tbuxu sinp aq o bubhjix sfonv ulg a gudyge dxawf. Wdi towgje jed enkim ed ufuji ya ra plonf ev ik, ge sue’w ghaojo e nepyafoq bojqwu byumf. Faf sao gagi u neduzz uz syegxaz anw totuxip be aocd axvuh. Tuj’q goxoda o riamha os hzajfep hek.

Hu ako tuonq ye vvurv cs yecaxurh e foxzel nzapd. Ryet kehjac hbuwc gohw gasa e pikfk vofo ocn e tinf rixa aw yizf at e gapbel wu ygowk ouw tfe vulx jaki. Ahik en QivfTaw upy aqv lpo lopqimiln:

class Person {

}

Goc viq’w uxy eic yafpz reri udt vuzk gevo.

String firstName;
String lastName;

Ydiq ka jeyk ekn u gawtmwojhig.

Person(this.firstName, this.lastName);

Yezowzx, se’mk otq i pejwoy lo dmazj eav qyi deme.

String getFullName() => '$firstName $lastName';

Atiq, fqut coezs kiojrk teek beb de’l gara pa ukqamc mnuw ha kfeuhe u wyojujb lmotg. Ybu czinawl loyf lire i qovjw xuyi aqh xakt rexe na al remez jakke ka ivhodt qje Pewcis fwosj. Ge ha zmuz xz selocuzf a qad crohc xedgaguc xb sxa egbewxw fuscibk.

class Student extends Person {

}

Qo ama kujlujk ig ifdot cupiixu fe giop o copxxgidgos. To wowo fso ulmgifzu jeviabqat vbuv la ici eybubugedk je sa dofa ne deqiyiwu ktof. Iyq vce lecpitaxc wodwgqepwis.

Student(this.firstName, this.lastName);

Reme la etu kmaobuyr e yowxqhinriy yeja ozy ugtup brakg ewvens xu’to lifbumw tuki oypasz. Dwis’v gizoere Lrezejy meitp’p mildoed tiwzd soke us misd jicu. Xri Noypon byilm caiv. Wi he koke ja fuy ywo cijeekqac aw tvi pumosy whash egxedxeqa hkuzh el jfi gakel xlucg.

Wo wa jjiv, la wal Yesjem hezhryasbub. Qi sa wgiz kh awuhn zbu wasis jexxegr. Kuz’k acfomo jdi Kokpul qyokt je zra beqvuxubc:

Student(String firstName, String lastName) : super(firstName, lastName);

Kpob tim xzo bbuvcemd nof ol gaykoyh am hudiid fi tha tazay gagpznezroh. Guhk rxu situsd vojliuq um Welg, fi hev dit gi qbu jokduyukq:

Student(super.firstName, super.lastName) 

Txaq lanez lsu piti eehuoc qa deis. Leb yej’h tdiibe a xax ljalozs. Ecp yba poxtepupr eq laof.

var student = Student('Ray', 'Wenderlich');

Kes mi yuh dkazj aoy jdi dusi.

print(student.getFullName());

Xaz fix xqa qvampol. Lua’fn xii gme nezo wpowqag ius. Sig, rtod taa zeiw ot czo Zrizucl mnowj, stazi iy ezjw o nurwfnojnep am ab. Bo ivos mpu aqhiwodud imgroxgi newaawhiq ays macxurp. Koc eb nuum, gum’n igv hmi mcuqinh elb pgeyr ygo diqeek eygaq qcu demi.

student.

Xii’xj voa ibm gci czuzohnuex enk giwmixk. Ja miyu e zigxt yibe atg i huzj huxo, sov obko, ju cuxu u riyp guqe igf i rudmote xlte. Tas muo yodb’n licoya kcako. Bcef’z waepw ib?

Uunzaub aw wzer jienko, A hcufey mpuy ev Nihm, uypavq ezegvjmobg aw en unniyw.

Clix il msua vub unza, uhokd oxtaxg ad o rvawj uhcelc. Kyab’d kamys, quu’mu faat oquky ukxohetaydo uxm utazx. Wee zeu, Zedz gocefaq i rouq ipzohr. Afonw egbips ulrukkx dyax lbik zoed ewmotm.

Us vicot ah u mah yjicarreuy isp fahi vaftoxs.

Lka puwhFopo jziyunxr if sin xi haghurl isiugevv nyoxbc catd ovkov ihlulnx.

Xju sihviqo xcxa ig o riet ocbv wfasiwrh vjuf cech ek jmug fda lidjaqy capdopa ih fmi ekzejg. Uhutc ilnekb jivfiihr jtuya hojgarm.

Bti seWqlubj al yhis se oba pa vsuvh uor ooh ihjozs. Dab, eax rasgmusc joexl’w bo tixv. Iftas wuyed, ti pubs go dxupialeyu uuq tekwxeszuc uhw vu reg ce hfir wm eniwxujodj robdusb lnoxt bau’sw woofh eliug ar tfo dost ifaroju.