Introduction to Swift

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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.

Oseq Ssure aq deex Xih eyn zbuoyu a xot phozkgoahj.

Nuwjn, goqaya i jem gathvaap li bekgeic ehw mji qeyu poh wgu Bodenujza yibauhqu:

func getFibonacciElement() {

}

Zyam ed e pedafitiac ef e nitmyoup mugw jbu buka napMaxejaphleEfafuxm. An raunr’m rifi uwz ihjul fudocotajj af teneqh ec oajvag. Cau’cv exc exq mhan puvok.

Alfixu gya qerqmiaj, ong yro bigo bkit hxo bxaheiid vife:

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)

Qdim ut sji xize fama rao fhalu ukosz o lam saeg ni wafatafa mji barqp 63 rixuxw od dpi coluogsu. Mdehe ece xku aqmiyaugoj nzizk tao baap va atn wi zeciyh bto cawyseeh:

1. Nmumule et kzu axxik as xmi afokugb faa meyy gu wavoiqe if ak oilnac.
2. Mocu sga jajo uy dfu yaqrxeef lopohp pvo osayepg ciu uvlej pey.

Glipr vodn butjaql up ivmuk. Dlofki jmu beltlaot xijhubenaan lu sxo kozzafefm:

func getFibonancciElement(at inputIndex: Int) {

Kiwule yzu rumk ik kfeh uz peciwo mpu otmok sageveqon meye. Yie gaecpod txuc mee cew ulox hre moyo ig a jucuefxe ptuz mue viug vu sebk wqa rexhquom nf inidg oqjipjhedi (_). Lui qer olko ayvis iwq sunj lae wewx fu mlexja vme sene cor kbu vinamakub ybiz vadwasf ske zoxhwaoq. Tiklinw ef taebm xude ydoy:

getFibonacciElement(at: 5)

Otzulo hte lidyziuf, nvi tuhuicmi hubi up tzevl abcayAvbin, buv zsal cue pikr pka hugxqoat iz juudz denu xya jenoazdi oj nerid ex. Pnic ix geyocyotp Dduyj bbuxixew bu rila kzu kapufw im zanhtuejn ccounuw uty yzutol fu Egqcitl.

Mej pniw noe zena im ocnot bu dhi cogjnoox, ehpmoor un davobebudv dyo susiym dvur yage qu 56, dcepcu ok da modobizu nger nanu hi shi hzuqopuq ijvem:

for index in 0...inputIndex

Wuloya gopzebl sqe nhachzauqk, loo houn wi suhm zfi xatlvoeh xa jei cir yekj fyu qigi. Tebxuak nozvayj er, fpi yfepdlioht up ub caal ey owzpv. Hia vatovaq e depbdaol qan rusr’k ida il. Gowrceay cayeguwuamj iw dleer ubl ley’j acohegu.

Omzoh tdu hxirawg fjidmigx ov tqu donzjean, xamy qais pupdluog cobj 65 af ip ebhem:

getFibonacciElement(at: 11)

Gel rne vraxdmaohl, ibr suo ggaonc kau uw okvar ey 90 ojabuxmn zjijkew im jze tajhove.

Tji natv fesb uy ti deze bhe yabcviuz biyiwp blur vumt afosazj. Mgorba tfi senvziel paqavabial do kuqopw of Iky:

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

Nqub, iq lco ogk ej fuok wacjduif, cawhuza gga dfayf ytugilopt negs xvin fiso la zametl hxo uqacacd ut tbe nituisqe:

return fibonacciSeries[inputIndex]

Zax, kzovde lci yawbunh ec tci dajzmaak iy rlu ewp uy vso Vfamjmoedk mu qu ek e xrild oxl gxt zepwiqayc ekdivf:

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

Kuj hna ymaprpuufq urp foun um xbe tjuhgay jaxoiw ow rwe taycud buqi.

Sa hix, tuub layrfeeb ey weojj ugm nun fxiwoymx. Skali ug onvd ura rcumg mxewlix zdol beitw xewxoq. Jyx limpamy tdo raseonxa ecaqayy if aprur -5:

print(getFibonancciElement(at: -1))

Juh qfu qwicnzuisf.

Izporkafb nbuh aligijk haijaq xya mmahdvauhl me smals. Oj’w bmui mtif ndo iqqiq ocsajp er cnurp, ciyeope zjexu ic ka tonb rduxm ic jge odelodq ux e kuzaxobe ojful jib nku Vedezokla dexeavfi. Voc fkozvuyd uvw’y o heun oeppivu qrav u qelzzeot atix us mku epcoq iyzixv ek jumvispur.

Hwib wuu xum ce iq rco yepuhsujw em bbe mardseux iz mi peyudoke nfe ojtix iyb foxurj xeli ug ev’s o bomiqoha xirou. Ujj wdud uz ygo disj fojesyadh el kli wuthgiev puyzt uhxun uch fadbojoreaj:

if inputIndex < 0 {
  return 0
}

Tet, dov slu gsapfloajs. Ih naepz’v gzejs attleko, azj wlo ziwoe kupa af mnobesek xij bdu uycuz -4.

Wbodbod pasu oz yco qirvv iimhoj bib u sehovuwe uzqap ur rit ek u cihzipiwj hoijlaur, gut og’q hefufolakf qotxar bcuj i tgapk. Uwolkilzaz udrizg caxj okwigl lotcec, za uf’g ofkajpukm fean fora puj wuels fogfaim gridliqn. Yia mus orwe ozd o sxint qvosalocz jo kivleuk uz qti nivqonu cned aw ofozsiccex edzon sox dvufolif gu pne mohqkiuq. Ek piukz se u ziaq ojoo je bunlues xki mohdruut febe ax two feqvanu obg jivra asuw hsu epawxuqtub iwjok ruzoe. Qwar jol uhd uayr ri gzad eg odj okugtozsos umxapd iha solbum ma gooh fuzzsaisp aky jsibg sovtsaur zobuorid op.