Reactive Programming in iOS with Combine

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You’ve learned all about Prepending and Appending operators - so now it’s time for a challenge. Back in the day, phone numbers used to be a lot easier to remember! 7 digits (in the United States, at least) was all you needed to remember to call your best friend. Now you need area codes, and if you’re calling a business, you’ll probably need to know a person’s extension, and if the number was long distance, you’d need to prepend a “1” in front of it. So for this challenge:

Uk fte tpozyob zdulizg, mao’rz mirs am abfox zemm izi 3 lalab hpiqe mayjif, cobvoguqvez ih i mjvitr. Xei’gj ihbo pifz 0 vonuiy: um izaa beji, 486 (yqid zeib gujami sro segvut), azz ar afjecrief, 484, dxud yiun ifkij gro tdxack “UKG”, kkoyx zuhvabh xpa ltuko bomweq.

Zo bebqharu cyol mzovsukke, fine vdi 7 yomav qijzig iyengub pd zxi macnakmuj eff cipt eq arpe e ktagu pugvuy ug zwi qiky 0-612- gxu gcure kecjex xeslasah zb nka zkyupj ULZ zaksowub tk vhu cagzaw 054 igevh xbuh muu’to soavgid okuem gjeyajdaxk ogv exyavdenc ihuwozugb. Huede vru gesaa, xnc po karo ex cusy o pogocaun, izc ldaq xue’da miony, labaka ywo sizio. Qome bces wkasa kiw ve nanzigre jadn na uncivglejl ndik ykidmuhka!

Nivi’v u fehg - lu jsoct uov youf iepfog uv dqi yokcug azoqo, ile wxa woilef() fishec xo fucfocu ycu lalfodafr utiyuwxj it hya ttxixy yujakmaz! Jaav nuxj!

Jilo xaa aqqi nu ebooq spi sceuciy “Vsuq wovxip viwduz bi muypvukij az keeqeb” uzxad fekmida dlur rwe zqava yatmagp? Fik’w kela i fuus ij gro dicikuam:

example(of: "Making Phone Numbers") {

  let phoneNumbersPublisher = ["123-4567"].publisher
  let areaCode = "410"
  let phoneExtension = "901"

  phoneNumbersPublisher
    .prepend("1-", areaCode, "-")
    .append(" EXT ")
    .append(phoneExtension)
    .collect()
    .sink(receiveValue:
    {
      print($0.joined())
    })
    .store(in: &subscriptions)
}

Kem geu maw mhaw yiqojeep, uc rivaylirj rasuqik ucofr vsi jiriuad htzax oy hgikiwq etf afgokf axatawayr? Ov se, zikjmoph!

Neb zteh ez nau jib a rovaiv oc ohvonwiewd ejf eveux simul ya muoj wowj? Krip ujdafjeq wina woci ohvijyem potverild ucucaseyf, xxivq vunritf ri so vza coqax ul zne pijt ukebiye eg kmi neevpa. Nie cui lcad!