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hello i am new here please can someone explain what do i do wrong? 1 + 2 shouldBe
3
"Hello, " ++ "Scala!" shouldBe
Hello, Scala!
Evaluation failed : Compilation Error ; ERROR -> too many arguments (found 3, expected 2) for method evaluation: (res0: Int, res1: String): Unit at [227, 227, 227]
I have data in 4 fields - addressId, customerId, fromDate, toDate
I have multiple addresses and for each addresses, multiple customers would have stayed there
So, for example, just for address1, I have the 5 values, i.e. 5 tenants (101,102,103,104,105) - (address1, (101, 250, 350), (address1, (101, 100, 220),(address1, (101, 50, 90),(address1, (101, 175, 400), (address1, (101, 420, 500).
I am trying to group all the tenants who stayed in a given property for overlapping time and provide the overall start and end date of this overall overlapping date range.
For example, accounting for the overlapping dates and using the above values for address "address1" , answer would be
Adress. Customers. Start End
address1 [103] 50 90
address1 [101,102,104]. 100. 400
address1. [105] 420 500
I am currently facing a similar problem. I am undergoing scala spark training and this is part of my training. Any solution that works???
compile task works?
(Compile-generated-exercises / generateExercises) java.lang.ClassCastException: class sbt.internal.inc.MappedVirtualFile cannot be cast to class java.io.File (sbt.internal.inc.MappedVirtualFile is in unnamed module of loader sbt.internal.MetaBuildLoader @40f08448; java.io.File is in module java.base of loader 'bootstrap')
tried with:
KaTeX parse error: Can't use function '$' in math mode at position 5: anon$̲1.$anonfun$trav…: anon$1.$anonfun$traverse$2(list.scala:78)
[error] at cats.instances.ListInstances
anon$1.loop$2(list.scala:68)KaTeX parse error: Can't use function '$' in math mode at position 5: anon$̲1.$anonfun$fold…: anon$1.$anonfun$foldRight$2(list.scala:70)
[error] at cats.Eval$.advance(Eval.scala:271)
[error] at cats.Eval$.loop$1(Eval.scala:350)
[error] at cats.Eval$.cats$Eval
evaluate(Eval.scala:368)KaTeX parse error: Can't use function '$' in math mode at position 5: anon$̲1.traverse(list…: anon$1.traverse(list.scala:77)
[error] at cats.instances.ListInstances
anon$1.traverse(list.scala:16)KaTeX parse error: Can't use function '$' in math mode at position 5: anon$̲2.traverse(Trav…: anon$2.traverse(Traverse.scala:19)
[error] at org.scalaexercises.plugin.sbtexercise.ExerciseCompilerPlugin$.$anonfun$generateExercisesTask$32(ExerciseCompilerPlugin.scala:247)
[error] at scala.util.Either.flatMap(Either.scala:341)
[error] at org.scalaexercises.plugin.sbtexercise.ExerciseCompilerPlugin$.$anonfun$generateExercisesTask$30(ExerciseCompilerPlugin.scala:246)
[error] at scala.util.Either.flatMap(Either.scala:341)
[error] at org.scalaexercises.plugin.sbtexercise.ExerciseCompilerPlugin$.$anonfun$generateExercisesTask$27(ExerciseCompilerPlugin.scala:243)
[error] at scala.util.Either.flatMap(Either.scala:341)
[error] at org.scalaexercises.plugin.sbtexercise.ExerciseCompilerPlugin$.$anonfun$generateExercisesTask$1(ExerciseCompilerPlugin.scala:240)
[error] at scala.Function1.$anonfun$compose$1(Function1.scala:49)
[error] at sbt.internal.util.$tilde$greater.$anonfun
u2219$1(TypeFunctions.scala:62)KaTeX parse error: Can't use function '$' in math mode at position 5: anon$̲4.work(Transfor…: anon$4.work(Transform.scala:68)
[error] at sbt.Execute.$anonfun$submit$2(Execute.scala:282)
[error] at sbt.internal.util.ErrorHandling$.wideConvert(ErrorHandling.scala:23)
[error] at sbt.Execute.work(Execute.scala:291)
[error] at sbt.Execute.$anonfun$submit$1(Execute.scala:282)
[error] at sbt.ConcurrentRestrictions
anon$4.$anonfun$submitValid$1(ConcurrentRestrictions.scala:265)Hi, it's me again.
Doing local development, I need a turn around to run exercises, without being signed in on Github, is it possible?
I reviewed all the documentation but unfortunately did't find nothing related
Many thanks
http://localhost:9000/_oauth-callback?error=redirect_uri_mismatch&error_description=The+redirect_uri+MUST+match+the+registered+callback+URL+for+this+application.&error_uri=https%3A%2F%2Fdocs.github.com%2Fapps%2Fmanaging-oauth-apps%2Ftroubleshooting-authorization-request-errors%2F%23redirect-uri-mismatch&state=bd3d1ef4-f435-4d63-b93e-46244195983f
val compareRationals: (Rational, Rational) => Int = _1.numer*_2.denom - _2.numer*_1.denom
while _1
and _2
apparently are not the right ones to use?
compareRationals
is a function with two parameters of type Rational
, not with one parameter of a pair of Rationals. You can use the function literal syntax, or a case expression as it denotes a partial function, which is also a function. As the case expression was already given by @JamezMercier, here the alternative function literal (aka lambda expression).val compareRationals: (Rational, Rational) => Int = (x, y) => x.numer*y.denom - y.numer*x.denom