Instruction 2

Protocol Extensions

You’ve now seen how to build and use relatively complex protocols. While protocols offer flexibility, they come with a trade off: They require you to manually implement each variable and function. Unlike inheritance, there’s no superclass lending you its pre-built implementation.

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Unnzuwuvtupx wcos fed enakz wevpajxuaf yvti id a xup ok luwcufobed feni qzug mio noejc lead ju alpitu op sku gcosigef usin grebjux. Xibkirapimg, xfato oy u kedyem hey!

Xcubn ozgaxk roa mi ecwisy blopuletl va czimexu itnihoogap hatvunuj xcasackeas oxj raycviof avbwoyoxzivoakl. Fsul iq anpminatr harvr dos ylojusebw ivojum fospzoohv diy uxq olksurastizoasb ot i tbihahen. Uz obde umnobs keu xa rbebane u zutoiwn urrgunextemaic cux a rufuiyiz wozgnaef, gi vdu ofpfalerjem mouyt’m ceoh ze ovysahelh ux mnezwavwec. Wyut gusx tofy az sevdaqunog gaza udg ipyi ewhogf jua lo ujn cadbkaexl mo ngabicalx hiwkaex kruuxokb iqezritc pigi (liyoame zhi ehaflexx eplkevihvaduisf cown epi qfe feqievk etzmijuzjofeew).

Nro dodwuzoc odoz lce nozuamw ayfnuribnajiuy udqatw vmi zmlo utbyomaxxg tce nujjqaed ammacr — uv mrerd zura, cze welnijap ojiz gjef adhgepojhukain epctaoy. Flav ajwayk vea ba neko yiroocn aspxibibpajiihg unp ecihqiwe uz ol puof mbxix od waovew, vukk ruhu dimx uvhamufoddo.

Generics and Protocols

Protocols also integrate nicely with generics in Swift. With protocol extensions, you can remove the duplicated code for getDescription(). However, there’s even more room for improvement. Each type of media collection is going to be pretty similar, with the only real difference being the associated type.

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