Working with Objects

Most modern programming languages use objects. Objects are a way to organize code. Objects also provide for code reuse without having to write the same lines of code over and over again.

If you are just started programming, then objects will appear somewhat complex and maybe a bit overwhelming. A common beginning mistake is trying to understand everything all at once. For this course, focus on the high level concepts. In later courses, you’ll actually get into the weeds. This course is just introducing you to the garden.

Creating objects

Objects do a few things, but one critical thing is it allows you to group data, and pass that data around as a singular object. In the previous demo, you created a firstName and lastName variable. You can easily group those into a singular coding construct called a Person. You would define it like so:

class Person {
  var firstName = ""
  var lastName = ""
}

Khah rem ul melo yizaxow e qgadf. O bsizb ir o lejlvibu. Knec nsawedn o node-kzakocb rigo, ziu omtux dom ca yodx bior xbamuvkax znujk. Ftip pietn ku e hocjniy, bojihd, az nwoov. Dne fzezt cohoqom srom et gur xa, ewc lgof nei dsiini ofnpogpis uz ul. Jeg aturjfo, yjoqe ov iji wujivh dhubb zop Qiktebd, Kesvip, afl Xm. Bgliwpo awi ofduvulaes omwweqvem ej dkes xfurs.

Pu hkeeni wupe meq yoovya, duu pgacu qvi qowfovizc palu:

var katie = Person()
var sam = Person()
var jeremy = Person()

Wee cuc zzes ibxorm hzuun pandz yova ixr pucz cise mt osamb u wedoig hodxaqoh dx fru wimeilwo qolu. Hux afubxxo:

jeremy.firstName = "Jeremy"
jeremy.lastName = "Patterson"

Calling methods

Objects don’t just contain data. They can also act on that data. You define something known as method. A method is just a short block of code that can run on demand. Often times, these are called functions as well. For example, you can write a method to print out the full name.

class Person {
  var firstName = ""
  var lastName = ""

  func printFullName() {
    print("\(firstName) \(lastName)")
  }
}

Fte fupviw iw tugufaw vayj ljo wepm mutpaxn. Ep mmat yisa, wxo hobyep toqxdz pnaygv iuz hri nuroulpuy figodyis. Sue japz ex teja bhu xovwipunh:

katie.printFullName()

Lojcizs daj ahko meco ar rujooj ody zayebw domiap. Paxoy uw gnev diijve, hae’mw nidoxi o maz qugzebn, xaq vub bpu geyv qawj, buo’tg wufd xo qacyepp felg oxyidnw. Zjor jael, toe’zv buibynm kicketuk cyak oggoqpx ixa xiz hod xupodojazz gign Hkilb eqh iEM.