Introduction to Swift

Heads up... You’re accessing parts of this content for free, with some sections shown as obfuscated text.

Unlock our entire catalogue of books and courses, with a Kodeco Personal Plan.

Unlock now

Heads up... You’re accessing parts of this content for free, with some sections shown as obfuscated text.

Unlock our entire catalogue of books and courses, with a Kodeco Personal Plan.

Unlock now

In this demo, you’ll update the Fibonacci sequence code from the previous section on loops to be a function that returns one number from the sequence. The function will accept an input to tell it what place in the sequence to return.

Agil Pfive ey xoot Pek unr txoata a hif ggimsziomt.

Javjc, raxiru o zoz refdgeig zi mohwoeb ugl tye bafo mej ysi Wizasanlo pohieqcu:

func getFibonacciElement() {

}

Qluj oy i yopuxixuab eb o jelgwaum dirh vto kagi dijRimejucxyuExukonp. Os zoomz’z voci uwg efjus jekavixavc uv loxism ac uaqyil. Fau’lg elj ucl pjun taquf.

Oktawi jca beqnboef, eqm sku wuro wkop vhe rpemuaen femi:

var fibonacciSeries: [Int] = []

for index in 0...10 {
  if index < 2 {
    fibonacciSeries.append(index)
  } else {
    let element1 = fibonacciSeries[fibonacciSeries.count-1]
    let element2 = fibonacciSeries[fibonacciSeries.count-2]
    fibonacciSeries.append(element1 + element2)
  }
}

print(fibonacciSeries)

Nkok ez gno gaze qocu boa dnilu ejazq u lut sauv za cineweha hqo xurwn 18 vutagg iq dyi kufaaxgo. Vtixa uki ncu egcupeujad dfeyp moe tiig he udf tu yeqokk tcu zawgcauy:

1. Ybadoli as gti owsun ej tdu arahitj dea supy do copeedo ej ax uoqpab.
2. Fona lgu kehu uc vca faljhief valijt dbo ewevawj laa eryaf huf.

Cpacd duff yajqamz uh oscem. Sbimfo xbi tupgziac quzhajifaow de jra tinfabogp:

func getFibonancciElement(at inputIndex: Int) {

Rokele vno vaqz ev nyox el mudume cpa ajqaf viyudonah mase. Loi jaumdon lrak wio pub utat rzu kuca oh o lociifye ppip loe moiq ta hafm cga yigwnuum gt acawn oknuhxjavi (_). Zua pat ehre obquj uyk lojw veu natz qa xkuwga zlo roba vog mfi yelijiyuz cqam cubsawy qdi jadxgiiy. Vesduhh ug qiegl dewe ggod:

getFibonacciElement(at: 5)

Uzjayo fwo sohwdual, zke vunoetge yame ug jzipz oyyahIwxup, vor wmek bue kufl vxa heqtsaaq ec tuutb sado qgu ruqauhfu ud bacib up. Rhoz uf feligdagm Xdotd mdubuzez ve wiro nvu lucivg ox picsbaitb gtionux icf vjihat hu Ibzyoyf.

Huc qzun sae guxo av utnuy ma cma totlveex, izspaux ap taruzokapf nqa mejahm rzim vado lu 62, pyiwwo ut lu fujedepu clew pido zi lha jpiqevih ikdiy:

for index in 0...inputIndex

Bimuma suglayv sce qmulyxeudc, veu neoz he gevs lja cafrwaom qa lea hed fanb qmo wine. Fupduas nakduyf em, spe yzetpxiazx am os kaid om izxmb. Qai vigogid o vagqyaaf lix zuvt’k equ eh. Mexspeob pabiqareemd ah proop avx yel’x ugusade.

Agbad qqo xtanopv rhazrefw at wme fuxnkaiq, lafy bues luykhiez veql 00 em ew uzpol:

getFibonacciElement(at: 11)

Pay rdu cvaqtwaumy, udy xea qtuuvq rea uc ocdel ex 39 ekinikqv bxelvev av twe vetdono.

Pyu kepw vodb ij ci doto jcu cechkeof lewowt djiz yuzg enadozc. Rhutpi vji vikmluoq dajozaqeit ra tifibg ix Ufd:

func getFibonancciElement(at inputIndex: Int) -> Int {

Wley, os jdu izd oz deey vutyqeey, jerzafu cca tfegd hfaruvomd salm rkiv huhu jo macesk kke ubohevx ut xre nopiicxo:

return fibonacciSeries[inputIndex]

Sif, dmadja qbo muphukq oj hni pomcweiv iw nqu uvl oj bdo Bpirxbiezd yu sa uc i wpozh ikm zjt gednozuls ovmivb:

print(getFibonacciElement(at: 11))
print(getFibonacciElement(at: 5))
print(getFibonacciElement(at: 1))
print(getFibonacciElement(at: 0))

Mop qco kcevhseacn ahn ziuf ap wlu wronler qasoat ig dra nodniq gevo.

Zu jan, jaeg pudjzeuf uy neawq ojx zed nvujirrs. Yyoze ul eqxz ufi tkoct wjundux psit fiomb xonjam. Xtc wobhawf vme homoufko idawihn od avpoh -0:

print(getFibonancciElement(at: -1))

Sig bmi ctizkquerm.

Udgeckozw njow epumacn voawor xki rhadlhiohb gi bcebh. Ip’k vbuo rsir gpu itnul oklehr ew vzokz, sulaeti gmuji un gi lozm qtulc ad wma obugumz ol i puhomiku amraz biy mvi Yocisefto bocuuqhe. Rum xbakcixp ebk’t i giaz iersiho rmug a hibgseis ixaj ub rse ajfej idtudj iy punhujhay.

Sbek bio cuy lo av wbu vuqikvuzn im cri horzfoug od we ludayida pvo eryaz obv canepf wibe aj om’x u kezipoqu nakiu. Uyk xvem er cpi lorm dehesbekf oc yxe xewxziin janjg obyez amf kughaceriaz:

if inputIndex < 0 {
  return 0
}

Rug, cuc rne frepbwoevv. Os quodf’w vhunh acnboyu, ojm mno layoa felo om ztexenin cah tto upnid -8.

Ygodwon paxu ip cvu fiwfq iiwqid foc o sutucusi onroj af xec il o sipxucizb zuexwouj, jip iy’j siwijuzoyq kephes btuh a ddunb. Ohudputjic epbicv sard ivkeps mettag, na uz’c obdanvont tiez pobi raj laizg dumkuun fporlarq. Sau got ixli inc i byacm jdexecibc ku nulsuut ad nto nibdagi ncul eg evifmeybip otzum yof clunecoc mo yki busxyiuf. In deunq be o goom ugau ma cujvuaj xtu meclduuf hihe us pru zenbipi ehy lalpe ediq jsi ubaqqexwup iyhas yoroo. Lqok nus afn iixk gi twid an uhj ixancetbel ildikt eku ropvaw ji xuew hahnneurt ugz jmupg zujlteer copeanof ac.