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ch4_solutions.md

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Ch4 Exercise Solutions

  1. Refer to src/main/scala/Ch4Helpers for solutions and src/test/scala/Ch4Tests for tests.
  2. Refer to src/main/scala/Ch4Helpers for solutions and src/test/scala/Ch4Tests for tests.
  3. Refer to src/main/scala/Ch4Helpers for solutions and src/test/scala/Ch4Tests for tests.
  4. Refer to src/main/scala/Ch4Helpers for solutions and src/test/scala/Ch4Tests for tests.
  5. Refer to src/main/scala/Ch4Helpers for solutions and src/test/scala/Ch4Tests for tests.
  6. Refer to src/main/scala/Ch4Helpers for solutions and src/test/scala/Ch4Tests for tests.
  7. scala> import scala.collection.JavaConverters._
import scala.collection.JavaConverters._

scala> val props = java.lang.System.getProperties.asScala
props: scala.collection.mutable.Map[String,String] =
Map(env.emacs -> "", java.runtime.name -> Java(TM) SE Runtime Environment, sun.boot.library.path -> /Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home/jre/lib, java.vm.version -> 25.162-b12, gopherProxySet -> false, java.vm.vendor -> Oracle Corporation, java.vendor.url -> http://java.oracle.com/, path.separator -> :, java.vm.name -> Java HotSpot(TM) 64-Bit Server VM, file.encoding.pkg -> sun.io, user.country -> US, sun.java.launcher -> SUN_STANDARD, sun.os.patch.level -> unknown, java.vm.specification.name -> Java Virtual Machine Specification, user.dir -> /Users/gchen213/scala-for-the-impatient, java.runtime.version -> 1.8.0_162-b12, java.awt.graphicsenv -> sun.awt.CGraphicsEnvironment, java.en...

scala> for((k,v) <- props) println(s"$k | $v")
env.emacs | 
java.runtime.name | Java(TM) SE Runtime Environment
sun.boot.library.path | /Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home/jre/lib
java.vm.version | 25.162-b12
gopherProxySet | false
java.vm.vendor | Oracle Corporation
java.vendor.url | http://java.oracle.com/
path.separator | :
java.vm.name | Java HotSpot(TM) 64-Bit Server VM
file.encoding.pkg | sun.io
user.country | US
sun.java.launcher | SUN_STANDARD
sun.os.patch.level | unknown
java.vm.specification.name | Java Virtual Machine Specification
user.dir | /Users/gchen213/scala-for-the-impatient
java.runtime.version | 1.8.0_162-b12
java.awt.graphicsenv | sun.awt.CGraphicsEnvironment
java.endorsed.dirs | /Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home/jre/lib/endorsed
os.arch | x86_64
java.io.tmpdir | /var/folders/3g/4g6_fhpd6yb14l6m8vrk0p1w0000gq/T/
line.separator | 

java.vm.specification.vendor | Oracle Corporation
os.name | Mac OS X
sun.jnu.encoding | UTF-8
java.library.path | /Users/gchen213/Library/Java/Extensions:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java:.
java.specification.name | Java Platform API Specification
java.class.version | 52.0
sun.management.compiler | HotSpot 64-Bit Tiered Compilers
os.version | 10.12.6
scala.boot.class.path | /usr/local/Cellar/scala/2.12.4/libexec/lib/jline-2.14.5.jar:/usr/local/Cellar/scala/2.12.4/libexec/lib/scala-compiler.jar:/usr/local/Cellar/scala/2.12.4/libexec/lib/scala-library.jar:/usr/local/Cellar/scala/2.12.4/libexec/lib/scala-parser-combinators_2.12-1.0.6.jar:/usr/local/Cellar/scala/2.12.4/libexec/lib/scala-reflect.jar:/usr/local/Cellar/scala/2.12.4/libexec/lib/scala-swing_2.12-2.0.0.jar:/usr/local/Cellar/scala/2.12.4/libexec/lib/scala-xml_2.12-1.0.6.jar:/usr/local/Cellar/scala/2.12.4/libexec/lib/scalap-2.12.4.jar
user.home | /Users/gchen213
user.timezone | 
scala.home | /usr/local/Cellar/scala/2.12.4/libexec
java.awt.printerjob | sun.lwawt.macosx.CPrinterJob
file.encoding | UTF-8
java.specification.version | 1.8
scala.usejavacp | true
java.class.path | ""
user.name | gchen213
java.vm.specification.version | 1.8
sun.java.command | scala.tools.nsc.MainGenericRunner
java.home | /Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home/jre
sun.arch.data.model | 64
user.language | en
java.specification.vendor | Oracle Corporation
awt.toolkit | sun.lwawt.macosx.LWCToolkit
java.vm.info | mixed mode
java.version | 1.8.0_162
java.ext.dirs | /Users/gchen213/Library/Java/Extensions:/Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home/jre/lib/ext:/Library/Java/Extensions:/Network/Library/Java/Extensions:/System/Library/Java/Extensions:/usr/lib/java
sun.boot.class.path | /Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home/jre/lib/resources.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home/jre/lib/rt.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home/jre/lib/sunrsasign.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home/jre/lib/jsse.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home/jre/lib/jce.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home/jre/lib/charsets.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home/jre/lib/jfr.jar:/Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home/jre/classes:/usr/local/Cellar/scala/2.12.4/libexec/lib/jline-2.14.5.jar:/usr/local/Cellar/scala/2.12.4/libexec/lib/scala-compiler.jar:/usr/local/Cellar/scala/2.12.4/libexec/lib/scala-library.jar:/usr/local/Cellar/scala/2.12.4/libexec/lib/scala-parser-combinators_2.12-1.0.6.jar:/usr/local/Cellar/scala/2.12.4/libexec/lib/scala-reflect.jar:/usr/local/Cellar/scala/2.12.4/libexec/lib/scala-swing_2.12-2.0.0.jar:/usr/local/Cellar/scala/2.12.4/libexec/lib/scala-xml_2.12-1.0.6.jar:/usr/local/Cellar/scala/2.12.4/libexec/lib/scalap-2.12.4.jar
java.vendor | Oracle Corporation
file.separator | /
java.vendor.url.bug | http://bugreport.sun.com/bugreport/
sun.io.unicode.encoding | UnicodeBig
sun.cpu.endian | little
sun.cpu.isalist |
  8. Refer to src/main/scala/Ch4Helpers for solutions and src/test/scala/Ch4Tests for tests.
  9. Refer to src/main/scala/Ch4Helpers for solutions and src/test/scala/Ch4Tests for tests.
  10. Zipping together two Strings makes tuples out of the chars of each string that are in the same position, like so: 
    scala> "Hello".zip("World")
res0: scala.collection.immutable.IndexedSeq[(Char, Char)] = Vector((H,W), (e,o), (l,r), (l,l), (o,d))
    A possible use case for this might be in preparation for a radix sort on the Strings