Waa Maxay DRY (Don't Repeat Yourself)
DRY (Don't Repeat Yourself) waa mid ka mid ah mabaadi'da aasaasiga ah ee Software Engineering-ka. Fikraddan waxaa markii ugu horreysay lagu soo bandhigay buugga caanka ah ee The Pragmatic Programmer.
DRY (Don't Repeat Yourself) waa mid ka mid ah mabaadi'da aasaasiga ah ee Software Engineering-ka. Fikraddan waxaa markii ugu horreysay lagu soo bandhigay buugga caanka ah ee The Pragmatic Programmer.
Macnaha oo kooban waa: "Qayb kasta oo aqoon ama logic ah waa inay leedahay hal meel oo kaliya oo ay ka timaaddo nidaamkaaga dhexdiisa."
Haddii aad aragto adigoo Copy-Paste ku samaynaya koodka meel ka mid ah project-gaaga una geynaya meel kale, ogow waxaad jabisay sharciga DRY, waxaadna abuurtay dhibaato mustaqbalka soo bixi doonta.
Koodka oo lagu cel-celiyo (Duplication) wuxuu keenaa saddex dhibaato oo waaweyn: 1. Dayactirka oo Adkaada (Maintenance Nightmare): Haddii aad logic isku mid ah ku qortay 5 meelood, maalinta loo baahdo in wax laga beddelo, waa inaad 5-taas meelood mid mid u beddeshaa. Haddii aad hal meel ilowdo, nidaamkaagu wuu khaldamayaa.
2. Bugs oo bata: Mar kasta oo koodku bato, fursadda uu khalad ku dhici karo way badanaysaa. Koodka soo noqnoqda wuxuu noqdaa meelaha ugu badan ee "Bugs"-ku ku dhuuntaan.
3. Akhriska oo Adkaada: Koodka nadiifka ah waa mid kooban. Haddii file-kaagu yahay 1000 sadar, laakiin 500 oo ka mid ah ay yihiin wax soo noqnoqday, way adag tahay in developer kale fahmo waxa socda.
TUSAALE FUDUD: Aynu nidhaahno waxaad dhisaysaa App xisaabaya canshuurta (Tax).
Qaabka Qaldan (WET - Write Everything Twice): Waxaad ku qortay xisaabta canshuurta Invoice-ka, haddana waxaad ku qortay Report-ka, haddana Email-ka. Haddii dowladdu beddesho heerka canshuurta, waa inaad saddex meelood beddeshaa.
Qaabka Saxda ah (DRY): Waxaad samaynaysaa hal function oo la yiraahdo calculateTax(). Meel kasta oo canshuur looga baahdo (Invoice, Report, Email), waxaad u yeeraysaa function-kaas kaliya. Haddii canshuurta la beddelo, hal meel kaliya ayaad ka beddelaysaa.
KHALADKA LAGA FAHMO DRY: Dadka qaar waxay u qaataan in DRY ay tahay inaan marnaba labo sadar oo isku mid ah la qorin. Sax maahan:
Ha isku dhibin (Over-engineering): Mararka qaar, haddii aad isku daydo inaad wax walba "Abstract" ka dhigto, koodkaagu wuxuu noqonayaa mid aad u adag oo la fahmi waayo.
Rule of Three: Qaanuun fiican ayaa jira la yiraahdo "Rule of Three". Wuxuu leeyahay: "Ha samaynin function guud ilaa aad koodka isku midka ah qorto saddex jeer."
WET: CADOWGA DRY Cakis-ka DRY waxaa loo yaqaan WET. Waxay u taagan tahay "Write Everything Twice" (Wax walba labo jeer qor), ama si kaftan ah "We Enjoy Typing" (Waan jecelnahay wax qorista). Waa calaamadda developer-ka aan khibradda lahayn ama caajiska ah ee jecel Copy-Paste-ka. Hadafka DRY ma aha oo kaliya inaad qorto kood yar, balse waa inaad samayso nidaam fudud, la beddeli karo, laguna kalsoonaan karo.
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