Morethanasync ibutorforeachproject為什么要有async？-問題描述?組裝上游數(shù)據(jù)道染頁面為什么要有async？-同步實現(xiàn)functiongetNewsArticle(){varpost=wordpressApi.getPostbyCategory('news');varlistings=syndicationApi.getListings(post.district);vararticle={'content':post.content,'listings':listings};returnarticle;}為什么要有async？-同步實現(xiàn)functiongetNewsArticle(){varpost=wordpressApi.getPostbyCategory('news');varlistings=syndicationApi.getListings(post.district);vararticle={'content':post.content,'listings':listings};returnarticle;}為什么要有async？-同步實現(xiàn)functiongetNewsArticle(){varpost=wordpressApi.getPostbyCategory('news');varlistings=syndicationApi.getListings(post.district);vararticle={'content':post.content,'listings':listings};returnarticle;}為什么要有async？-同步實現(xiàn)functiongetNewsArticle(){varpost=wordpressApi.getPostbyCategory('news');varlistings=syndicationApi.getListings(post.district);vararticle={'content':post.content,'listings':listings};returnarticle;}為什么要有async？-同步實現(xiàn)functiongetNewsArticle(){varpost=wordpressApi.getPostbyCategory('news');varlistings=syndicationApi.getListings(post.district);vararticle={'content':post.content,'listings':listings};returnarticle;}實現(xiàn)async的不同機制-level1至level3在各種語言中的現(xiàn)狀level3:monadlevel2:asyncwithexceptionhandlinglevel2:asyncwithoutexceptionhandlinglevel1:generator200520102015Futurelevel0:callback-Continuation-passingstyle(CPS)functiongetNewsArticle(callback){wordpressApi.getPostbyCategory('news',function(post){syndicationApi.getListings(post.district,function(listings){vararticle={'content':post.content,'listings':listings};e});});}level0:callback-CPSwithexceptionhandlingfunctiongetNewsArticle(callback){wordpressApi.getPostbyCategory('news',function(err,post){if(err){callback(err)return}syndicationApi.getListings(post.district,function(err,listings){if(err){callback(err)return}vararticle={'content':post.content,'listings':listings};callback(null,article);});});}level0:callback-PromiseandthenfunctiongetNewsArticle(callback){wordpressApi.getPostbyCategory('news').then(function(post){syndicationApi.getListings(post.district).then(function(listings){vararticle={tentpostcontente};};}}level1:generator-ECMAScript2015function*idMaker(){varindex=0;while(true)yieldindex++;}vargen=idMaker();console.log(gen.next().value);//0console.log(gen.next().value);//1console.log(gen.next().value);//2level1:generator-C#2.0andUnity//Getthelatestwebcamshotfromoutside"Friday's"inTimesSquareemCollectionspublicclassExampleClass:MonoBehaviour{publicstringurl="/ec_metros/ourcams/IEnumeratorStart(){WWWwww=newWWW(url);ldreturnwwwRendererrenderer=GetComponent<Renderer>();inTexturewwwtexture}}asyncfunctiongetNewsArticle(){letpost=awaitwordpressApi.getPostbyCategory('news');letlistings=awaitsyndicationApi.getListings(post.district);letarticle={'content':post.content,'listings':listings};}-定義一個異步(或同步)操作函數(shù)-定義一個異步(或同步)操作函數(shù)directstylefunctionop(){//???}sfunctionop(callbacksfunctionop(callback){//???}-定義一個異步(或同步)操作函數(shù)directstylefunctionop(){//???}sfunctionop(callbacksfunctionop(callback){//???}-定義一個異步(或同步)操作函數(shù)directstylefunctionop(){//???}asyncfunctionop(){//???}sfunctionop(callback){//???}sfunctionop(callback){//???}asyncTaskop(){//???}Scalaeachdefop=monadic[Future]{//???}-定義一個異步(或同步)操作函數(shù)directstylefunctionop(){//???}asyncfunctionop(){//???}@:asyncfunctionop(){//???}letop()=async{//???}-執(zhí)行一個操作-執(zhí)行一個操作directstylevarresult=op();sop(function(resultsop(function(result){//???});-執(zhí)行一個操作directstylevarresult=op();sop(function(resultsop(function(result){//???});-執(zhí)行一個操作directstylevarresult=op();varresult=awaitop();sop(function(result){//???})sop(function(result){//???});varresult=awaitop();Scalaeachvalresult=op().each-執(zhí)行一個操作directstylevarresult=op();varresult=awaitop();varresult=@awaitop();-順序執(zhí)行多個操作-順序執(zhí)行多個操作directstylevarresult1=op1();varresult2=op2(result1);sop1(function(sop1(function(result1){op2(result1,function(result2){//???});});-順序執(zhí)行多個操作directstylevarresult1=op1();varresult2=op2(result1);sop1(function(sop1(function(result1){op2(result1,function(result2){//???});});-順序執(zhí)行多個操作directstylevarresult1=op1();varresult2=op2(result1);varresult1=awaitop1();varresult2=awaitop2(result1);sop1(function(result1){op2sop1(function(result1){op2(result1,function(result2){//???});});varresult1=awaitop1();varresult2=awaitop2(result1);Scalaeachvalresult1=op1().eachvalresult2=op2(result1).each-順序執(zhí)行多個操作directstylevarresult1=op1();varresult2=op2(result1);varresult1=awaitop1();varresult2=awaitop2(result1);varresult1=@awaitop1();varresult2=@awaitop2(result1);let!result1=op1()let!result2=op2(result1)-把多個操作的結(jié)果加起來-把多個操作的結(jié)果加起來directstylevarr=op1()+op2();sop1(function(sop1(function(result1){op2(function(result2){varr=result1+result2;});});-把多個操作的結(jié)果加起來directstylevarr=op1()+op2();sop1(function(sop1(function(result1){op2(function(result2){varr=result1+result2;});});-把多個操作的結(jié)果加起來directstylevarr=op1()+op2();varr=awaitop1()+awaitop2();sop1(function(result1){op2sop1(function(result1){op2(function(result2){varr=result1+result2;});});varr=awaitop1()+awaitop2();Scalaeachvalr=op1().each+op2().each-把多個操作的結(jié)果加起來directstylevarr=op1()+op2();varr=awaitop1()+awaitop2();varr=@awaitop1()+@awaitop2();let!result1=op1()let!result2=op2()letr=result1+result2-循環(huán)執(zhí)行操作-循環(huán)執(zhí)行操作directstylevararray=[3,5,7];for(vari=0;i<array.length;i++){op(array[i]);}svararray=svararray=[3,5,7];functionloop(i){op(array[i],function(){if(i<array.length){loop(i+1);}});}loop(0);-循環(huán)執(zhí)行操作directstylevararray=[3,5,7];for(vari=0;i<array.length;i++){op(array[i]);}svararray=svararray=[3,5,7];functionloop(i){op(array[i],function(){if(i<array.length){loop(i+1);}});}loop(0);-循環(huán)執(zhí)行操作directstylevararray=[3,5,7];for(vari=0;i<array.length;i++){op(array[i]);}vararray=[3,5,7];for(letelementofarray){awaitop(element);}svararray=[3,5svararray=[3,5,7];functionloop(i){op(array[i],function(){if(i<array.length){loop(i+1);}});}loop(0);vararray=newint[]{3,5,7};foreach(intelementinarray){awaitop(element);}Scalaeachvallist=List(3,5,7)for(element<-list){op(element).each}-循環(huán)執(zhí)行操作directstylevararray=[3,5,7];for(vari=0;i<array.length;i++){op(array[i]);}vararray=[3,5,7];for(letelementofarray){awaitop(element);}vararray=[3,5,7];for(elementinarray){@awaitop(element);}letlist=[3;5;7]forelementinlistdodo!op(element)-循環(huán)執(zhí)行操作并把結(jié)果存進數(shù)組-循環(huán)執(zhí)行操作并把結(jié)果存進數(shù)組directstylevarall=[];vararray=[3,5,7];for(vari=0;i<array.length;i++){all.push(op(array[i]));}vararrayvararray=[3,5,7];functionloop(i,result){op(array[i],function(currentValue){if(i<array.length){loop(i+1,result.concat([currentValue]));}else{varall=result;???}});}loop(0,[]);-循環(huán)執(zhí)行操作并把結(jié)果存進數(shù)組directstylevarall=[];vararray=[3,5,7];for(vari=0;i<array.length;i++){all.push(op(array[i]));}vararrayvararray=[3,5,7];functionloop(i,result){op(array[i],function(currentValue){if(i<array.length){loop(i+1,result.concat([currentValue]));}else{varall=result;???}});}loop(0,[]);-循環(huán)執(zhí)行操作并把結(jié)果存進數(shù)組directstylevarall=[];vararray=[3,5,7];for(vari=0;i<array.length;i++){all.push(op(array[i]));}vararray=[3,5,7];varall=[for(letelementofarray)awaitop(element)];vararray=[3,vararray=[3,5,7];functionloop(i,result){op(array[i],function(currentValue){if(i<array.length){loop(i+1,result.concat([currentValue]));}else{varall=result;???}});}loop(0,[]);varall=newList<int>();vararray=newint[]{3,5,7};foreach(intelementinarray){builder.Add(awaitop(element));}Scalaeachvallist=List(3,5,7)valall=(for{i<-list.monadicLoop}yieldop(i).each).underlying-循環(huán)執(zhí)行操作并把結(jié)果存進數(shù)組directstylevarall=[];vararray=[3,5,7];for(vari=0;i<array.length;i++){all.push(op(array[i]));}vararray=[3,5,7];varall=[for(letelementofarray)awaitop(element)];vararray=[3,5,7];varall=[for(elementinarray)@awaitop(element)];letlist=[3;5;7]letall=seq{forelementinlistdoyield!op(element)}level3:monadimportcom.thoughtworksimportcom.thoughtworks.each.Monadic._importscalaz.std.scalaFuture._//ReturnsaFutureofthesumofthelengthofeachstringineachparameterFuture,//withoutblockinganythread.defconcat(future1:Future[String],future2:Future[String]):Future[Int]=monadic[Future]{future1.each.length+future2.each.length}level3:monad-Optionmonadimportcom.thoughtworks.each.Monadic._importscalaz.std.option._defplusOne(intOption:Option[Int])=monadic[Option]{intOption.each+1}assertEquals(None,plusOne(None))assertEquals(Some(16),plusOne(Some(15)))level3:monad-Listmonadimportcom.thoughtworks.each.Monadic._importscalaz.std.list._defplusOne(intSeq:List[Int])=monadic[List]{intSeq.each+1}assertEquals(Nil,plusOne(Nil))assertEquals(List(16),plusOne(List(15)))assertEquals(List(16,-1,10),plusOne(List(15,-2,9)))level3:monad-Bindingmonadvaltarget=Var("World")valhello=monadic[Binding]{Hellotargeteach+"!"}assert(hello.get=="Hello,World!")argetEachassert(hello.get=="Hello,Each