ScalaSpark Review 6132014 Redo Week 1 First Scala

Recursion 3 exercises on Recursion Point is: to use matching as replacement for loops

Factorial factorial(n: Int): Int={ if(n==0) 1 else n*factorial(n-1) }

Factorial with match def factorial(n: Int): Int = n match{ case 0 => 1

codingbat examples http: //codingbat. com/java/Recursion-1 , recursion 2 Doesn't cover backtracking Doesn't exists for

Maven/Scalatest Disable surefire tests. Have to add the Java unit tests separately. HW uses

Demo > cd Test. Scalatest ; mvn test Some strange looking patterns: Either do

Spray. Can Scala server. Akka-io config, jetty config (servlets) Used in spark-job-server from Ooyala

Spray Resources Spray. Examples from github Add build. sbt, plugins. sbt Doesn't exist in

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Scala/Spark Review 6/13/2014 Redo Week 1 First Scala Course/Demo Scalatestest Spray Can (in Job. Server)/sbt

Recursion 3 exercises on Recursion Point is: to use matching as replacement for loops Very few if/then statements in proper Scala code Example: Factorial w/wo if then

Factorial factorial(n: Int): Int={ if(n==0) 1 else n*factorial(n-1) }

Factorial with match def factorial(n: Int): Int = n match{ case 0 => 1 case _ => n*factorial(n-1) }

codingbat examples http: //codingbat. com/java/Recursion-1 , recursion 2 Doesn't cover backtracking Doesn't exists for scala, copy and paste questions and code up solns in unit test. Add maven artifact/scalatest

Maven/Scalatest Disable surefire tests. Have to add the Java unit tests separately. HW uses @Run. With(class. Of[JUnit. Runner]) <group. Id>org. apache. maven. plugins</group. Id> <artifact. Id>maven-surefire-plugin</artifact. Id> <version>2. 7</version> <configuration> <skip. Tests>true</skip. Tests> </configuration>

Demo > cd Test. Scalatest ; mvn test Some strange looking patterns: Either do nested case statement or mixed if/case statements. Can't put conditionals in case () case _ => if (n<10 && n==7) 1 else if(n<10 && n!=7) 0 else if ((n%10)==7) 1+count 7(n/10) else count 7(n/10)

Spray. Can Scala server. Akka-io config, jetty config (servlets) Used in spark-job-server from Ooyala Sbt; build. sbt or scala code. Build. sbt specify k/v pairs for config map Job-server doesn't use build. sbt. Replace with scala code/sbt api No blank lines in sbt. build at top; uses for delimiters. Opposite of xml

Spray Resources Spray. Examples from github Add build. sbt, plugins. sbt Doesn't exist in Spray. Examples Match akka with spray-can versions java. lang. No. Such. Method. Error: akka. actor. Props$. apply(Lscala/Function 0; Lscal a/reflect/Class. Tag; )Lakka/actor/Props; at spray. can. Http. Ext. <init>(Http. scala: 153)