GivenanumberN,findtheNthtriangularnumber,i.e. 1+2+3+...+N/*_____________YourCodeHere_____________*/exporttypeNumberToArray<Textendsnumber,Rextends1[]=[]>=R["length"]extendsT?R:NumberToArray&

Given2sets(unions),returnitsCartesianproductinasetoftuples,e.g.CartesianProduct<1|2,'a'|'b'>//[1,'a']|[2,'a']|[1,'b']|[2,'b'] Solution:/*____________

/*533-Concat-------byAndreyKrasovsky(@bre30kra69cs)#easy#array###QuestionImplementtheJavaScript`Array.concat`functioninthetypesystem.Atypetakesthetwoarguments.Theoutputshouldbeanewarraythatincludesinputsin

/*189-Awaited-------byMaciejSikora(@maciejsikora)#easy#promise#built-in###QuestionIfwehaveatypewhichiswrappedtypelikePromise.Howwecangetatypewhichisinsidethewrappedtype?Forexample:ifwehave`Promise&l

title:'前端开发系列089-Node篇之os'tags:-Node系列categories:[]date:2018-10-0723:20:13一、OS模块介绍Node中的OS模块提供了和当前系统相关的一系列实用

Createa SnakeCase<T> genericthatturnsastringformattedin camelCase intoastringformattedin snake_case.Afewexamples:typeres1=SnakeCase<"he

Returnstrueifallelementsofthelistareequaltothesecondparameterpassedin,falseifthereareanymismatches.ForexampletypeTest1=[1,1,1]ty

Givenan unionoftypes and arrayoftypepairs toreplace([[string,number],[Date,null]]),returnanewunionreplacedwiththe typepairs. /*____

Capitalizethekeyoftheobject,andifthevalueisanarray,iteratethroughtheobjectsinthearray. /*_____________YourCodeHere_____________*/

Youhaveatargetobjectandasourcearrayofobjects.Youneedtocopypropertyfromsourcetotarget,ifithasthesamepropertyasthesource,youshould

Givenanarrayofintegers nums andaninteger target,returntrueiftwonumberssuchthattheyaddupto target./*_____________YourCodeHere________

Implement BinaryToDecimal<S> whichtakesanexactstringtype S consisting0and1andreturnsanexactnumbertypecorrespondingwith S when S isrega

ImplementtheadvancedutiltypeMutableKeys,whichpicksallthemutable(notreadonly)keysintoaunion.Forexample:typeKeys=MutableKeys<{readonlyfo

Implementthetypeversionof Object.fromEntriesForexample:interfaceModel{name:string;age:number;locations:string[]|null;}typeModelEnt

Implementageneric GetReadonlyKeys<T> thatreturnsaunionofthereadonlykeysofanObject.ForexampleinterfaceTodo{readonlytitle:stringreado

Implementthegeneric ClassPublicKeys<T> whichreturnsallpublickeysofaclass.Forexample:classA{publicstr:stringprotectednum:numberpri

Dropthespecifiedcharsfromastring.Forexample:typeButterfly=DropString<'foobar!','fb'>//'ooar!' /*_____________YourCodeHere_____________

Createatype-safestringjoinutilitywhichcanbeusedlikeso:consthyphenJoiner=join('-')constresult=hyphenJoiner('a','b','c');//='a-b-c'Or

Implementatype FilterOut<T,F> thatfiltersoutitemsofthegiventype F fromthetuple T.Forexample,typeFiltered=FilterOut<[1,2,null,3],null

Convertastringliteraltoanumber,whichbehaveslike Number.parseInt. /*_____________YourCodeHere_____________*/typeToNumber<Sextendsstring,

The get functioninlodash isaquiteconvenienthelperforaccessingnestedvaluesinJavaScript.However,whenwecometoTypeScript,usingfunctionslike

Implement CamelCase<T> whichconverts snake_case stringto camelCase.ForexampletypecamelCase1=CamelCase<'hello_world_with_types'>//expectedtobe

Implementatypethataddsanewfieldtotheinterface.Thetypetakesthethreearguments.Theoutputshouldbeanobjectwiththenewfield.Forexamplety

Implement CapitalizeWords<T> whichconvertsthefirstletterof eachwordofastring touppercaseandleavestherestas-is.Forexampletypecapitalized

Implementtheadvancedutiltype RequiredKeys<T>,whichpicksalltherequiredkeysintoaunion.ForexampletypeResult=RequiredKeys<{foo:number;bar?: