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>> [Music kucheza]

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>> SPIKA 1: Naam, hapa sisi ni,
mwisho kuweka P katika CS50.

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Kumpongeza wenyewe na kuwa na
kuja hadi sasa tangu hujambo yako ya kwanza

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ulimwengu na uchapishaji nje
piramidi kwa Mario.

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Unaweza kufanywa tovuti wiki iliyopita.

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Na tunakwenda kuwa maamuzi ya mtu mwingine
wiki hii, moja kwamba utapata

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gari karibu Harvard ya chuo hicho, kuokota
up CS50 wafanyakazi, na

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kuwaleta nyuma yao
nyumba za makazi.

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>> Sasa wiki iliyopita sisi kazi katika PHP,
server upande lugha.

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Kwa kuweka hii P, sisi ni kupata vishawishi
kwa JavaScript, ambayo ni

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mteja upande lugha.

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Basi hebu tuangalie baadhi ya
usambazaji kificho kwamba ni zinazotolewa na

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kwa kuweka hii P.

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>> Katika folder JavaScript, kutakuwa na
kuwa kundi la JavaScript files.

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Kuna buildings.js, ambayo ina
safu ya majengo karibu Harvard

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chuo, na habari zao
na msimamo.

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Houses.js ni safu ya Harvard
nyumba za makazi, na wao

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latitudo na longitude.

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Passengers.js ina
safu ya abiria -

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Wafanyakazi wanachama CS50 -

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kuwa wewe utakuwa kuleta nyuma
nyumba zao za kuishi.

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>> Math3D.js, ambayo ina mengi ya
kazi ya kufanya na harakati.

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Kama wewe ni hesabu nia,
basi mimi kuwakaribisha kuangalia.

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Lakini huna haja ya kuelewa
kila kitu huko.

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Shuttle.js, ambayo inahusika na
harakati kuhamisha ya.

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Na index.html ni ukurasa wa nyumbani ambapo
kila kitu kinachotokea, kwa kweli, ambapo

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user ni mazungumzo na tovuti.

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>> Service.css ni karatasi CSS style,
ambayo, pamoja na Twitter

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Bootstrap maktaba, udhibiti
jinsi index.html inaonekana.

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Na kisha sisi pia kuwa service.js, ambayo
ina kazi huduma kwa

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kuhamisha.

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Na hapa ni wapi utaenda kuwa
kujaza katika baadhi ya kwa dos.

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>> Sasa hebu tuangalie vitu na
arrays associative katika JavaScript,

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ambayo kwa makusudi na madhumuni ya
ni kubadilishana.

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Kama nilitaka kufanya kitu variable
aitwaye wand, napenda

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kutangaza.

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Na ndani ya braces wale curly napenda
bayana msingi ni nyati.

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kuni ni cherry.

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Na urefu ni 13.

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>> Sasa naweza pia kupata maadili
wa vitu kwa kutumia

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associative safu nukuu.

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Hivyo wand index msingi, siwezi kuweka
sawa sawa kwa nyati, au

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kuangalia kwamba, kama mimi haja.

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Au naweza kutumia dot operator.

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Wand dot kuni sawa na cherry,
na kadhalika, na kadhalika.

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Hivyo unaweza kuona kwamba arrays associative na
vitu katika JavaScript ni kwenda kuwa

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kubadilishana, na mapenzi
kuja katika Handy kabisa.

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>> Kisha sisi kuona safu ya majengo
katika buildings.js.

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Tena, safu ya vitu.

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Kama nilitaka kufanya safu ya bora
majengo juu ya Harvard ya chuo hicho, kisha

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Napenda kufanya hivyo kama ifuatavyo.

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Kutumia nukuu hii kitu, ambapo
Mimi kuhifadhi mizizi, jina, anwani,

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latitude, na longitude kwa kila
moja kujenga kitu.

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>> Hebu haraka majadiliano juu ya vigezo
katika JavaScript.

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Kama PHP, JavaScript vigezo
ni weakly au loosely typed.

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Kujenga variable ndani, wewe kiambishi
jina variable na V-A-R, var.

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>> Sasa katika JavaScript, kazi mapenzi
kupunguza wigo wa vigezo.

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Hivyo kama una variable za mitaa ndani ya
kazi, kisha kazi nyingine

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hawawezi kupata hiyo.

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Lakini tofauti na C, loops na hali hawana
kupunguza wigo wa kutofautiana.

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>> Hivyo hata kama wewe kutangaza ndani ya
hali, kazi nzima

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kuwa na huduma hiyo.

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Sasa bila var, variable
itakuwa kimataifa.

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Hivyo kama wewe tu kutangaza jina na
kuwapa thamani, basi, kwamba variable

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itakuwa variable kimataifa
katika JavaScript.

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>> Sasa katika nyumba, tuna associative
safu ya vitu aina nyumba, ambapo

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kila nyumba ni tu latitude
na longitude.

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Basi tuna abiria
safu, ambayo ni safu

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ya kitu aina ya abiria.

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Hivyo kila abiria ina jina la mtumiaji,
jina, na nyumba.

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Taarifa kwamba mimi nina kuona ya aina
abiria, ambayo kwa kweli ina maana

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kwamba kila kitu ina
sawa muhimu jozi thamani.

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Hivyo kila kitu ya aina abiria ina
jina la mtumiaji, jina, na nyumba.

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>> Basi je, tunahitaji
kufanya kwa ajili ya P kuweka?

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Naam, tunahitaji kuruhusu watumiaji kuchukua
up wafanyakazi, kwa kuonyesha yote ya

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wafanyakazi ambayo kwa sasa ni katika
kuhamisha zetu, na kuacha yao mbali.

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Na kisha tutaweza pia kuzungumza kuhusu ziada
makala ambayo yanaweza kutekelezwa kwa

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kuhamisha P kuweka.

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>> Lakini hebu majadiliano juu ya Pickup kwanza.

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nyuso za wafanyakazi CS50 wamekuwa
sehemu zote za chuo, ambapo kila

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uso unatekelezwa kama alama mahali
duniani 3D, na kama

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marker kwenye ramani yenye P2.

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Hivyo wakati mtumiaji Clicks Pickup
kifungo, tunataka kuongeza jirani

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abiria kwa kuhamisha.

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Na sisi pia unataka kuondoa nafasi yao
alama kutoka ulimwenguni, na kuondoa yao

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marker kutoka ramani, kuonyesha kwamba
wao uko katika kuhamisha wetu sasa.

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>> Hivyo ni jinsi gani sisi kuchunguza kama abiria
ni ndani ya mbalimbali ya kuhamisha yetu?

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Naam, mbali kazi -

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hivyo kuhamisha dot mbali, kupita katika
latitude na longitude, mapenzi

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mahesabu ya umbali kutoka sasa
nafasi ya kuhamisha

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uhakika kwamba wewe taja na kwamba
kutokana na latitude na longitude.

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Hivyo unaweza kutumia hii kwa mahesabu ya
umbali kutoka kuhamisha

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abiria.

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>> Lakini jinsi gani unajua ambapo
abiria ni?

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Naam, hiyo ni ambapo tutaweza kuwa na
hariri na idadi ya kazi.

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Na idadi ya maeneo yote ya wafanyakazi
na abiria ulimwenguni,

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na katika ramani, lakini haina
kuhifadhi eneo lao.

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Hivyo labda unaweza kuhifadhi yao
mahali alama na alama

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katika baadhi safu kimataifa.

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>> Sasa tayari kuna ni safu kimataifa
kuhifadhi taarifa kutoka kwa abiria.

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maduka ya abiria safu ya kila
jina abiria na nyumba zao.

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Hivyo labda unaweza kuongeza vigezo chache
kuna abiria vitu.

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>> Kutusaidia kuchunguza abiria wote
ndani ya mbalimbali ya kuhamisha wetu, wacha

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kitanzi kwa njia zote za abiria
abiria safu.

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kwa kitanzi katika JavaScript ili kuangalia
kitu kama hii, ni sawa na

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wale kwa kitanzi katika C. Au tunaweza kutumia
mbadala kwa ajili ya kitanzi muundo.

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>> Kwa var i katika safu, ambapo mimi
bado kuwa index.

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Lakini huna haja ya kutaja
safu dot urefu

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hali, na i pamoja na plus.

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Eneo kila abiria ni
uliotolewa na wao alama mahali.

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>> Lakini alama mahali ni si
latitude na longitude.

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Tuna kupata vigezo wale na
kupata jiometri, kwa kutumia kupata

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jiometri juu ya alama mahali.

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Na kisha mara moja tuna jiometri,
kupata ama latitude au

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longitude, kwa kutumia kazi hizo.

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>> Hivyo sasa tunajua jinsi ya kuchunguza kama
abiria ni ndani ya

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mbalimbali ya kuhamisha wetu.

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Mara baada ya sisi na abiria hao, tutaweza
unataka kuongeza abiria yoyote ambayo ni

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ndani ya mbalimbali.

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Tunataka kuwaruhusu hop juu, na
kuchukua kiti cha juu ya kuhamisha wetu, lakini tu

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kama tuna nafasi ya kutosha kwa ajili yao.

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>> kuhamisha dot viti safu mapenzi
kuonyesha kama viti ni tupu, au

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ambaye ni katika kiti cha.

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Hivyo kama kiti ni tupu, kisha
kiti cha itakuwa null.

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Hivyo iterate juu ya viti safu,
kuangalia kwa viti tupu, kuhifadhi

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abiria katika viti wale mpaka
hawana viti yoyote zaidi tupu.

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Na kwa bahati mbaya, abiria nyingine yoyote
itabidi kusubiri kwa

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wakati mwingine kuhamisha inakuja kote.

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>> Mara baada ya wao kupata kuhamisha, sisi utasikia wanataka
kuondoa yao alama mahali, ambayo

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ni picha zao katika dunia 3D.

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Kama nilitaka kuondoa mahali alama p,
basi napenda kupata yote ya makala

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kutoka nchi yangu, Google Earth,
na kisha kuondoa mahali maalum

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alama ya kutumia removeChild kazi.

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Kisha mwisho, hebu kuondoa marker,
icon juu ya P2 ramani kwa yoyote

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abiria kwamba sisi ni kuokota.

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Kuondoa marker, m, basi mimi itabidi
tu kutekeleza m dot setMap null.

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Je, hii kwa ajili ya abiria yoyote ndani ya mbalimbali,
na kumaliza ya Pickup.

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