.DS_Store
*~
target/
-testdata/debugger
\ No newline at end of file
+testdata/debugger
+*.userprefs
+bin/
+obj/
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</entry>
val combs = for (
i <- 1 to occurrences.length;
- l <- occurrences combinations i;
- l2 <- combinationsOnNumber(l)
+ l <- occurrences combinations i; // Combination on letters.
+ l2 <- combinationsOnNumber(l) // Combination on numbers
) yield l2
List() :: (combs toList)
--- /dev/null
+\r
+Microsoft Visual Studio Solution File, Format Version 12.00\r
+# Visual Studio 2012\r
+Project("{f2a71f9b-5d33-465a-a702-920d77279786}") = "Assignment_07-FSharp", "Assignment_07-FSharp\Assignment_07-FSharp.fsproj", "{E7DC4EE2-C349-4535-85C8-4EF519523148}"\r
+EndProject\r
+Global\r
+ GlobalSection(SolutionConfigurationPlatforms) = preSolution\r
+ Debug|x86 = Debug|x86\r
+ Release|x86 = Release|x86\r
+ EndGlobalSection\r
+ GlobalSection(ProjectConfigurationPlatforms) = postSolution\r
+ {E7DC4EE2-C349-4535-85C8-4EF519523148}.Debug|x86.ActiveCfg = Debug|x86\r
+ {E7DC4EE2-C349-4535-85C8-4EF519523148}.Debug|x86.Build.0 = Debug|x86\r
+ {E7DC4EE2-C349-4535-85C8-4EF519523148}.Release|x86.ActiveCfg = Release|x86\r
+ {E7DC4EE2-C349-4535-85C8-4EF519523148}.Release|x86.Build.0 = Release|x86\r
+ EndGlobalSection\r
+EndGlobal\r
--- /dev/null
+module Assignment_07_FSharp.AssemblyInfo
+open System.Reflection
+open System.Runtime.CompilerServices
+
+[<assembly: AssemblyTitle("Assignment_07-FSharp")>]
+[<assembly: AssemblyDescription("")>]
+[<assembly: AssemblyConfiguration("")>]
+[<assembly: AssemblyCompany("")>]
+[<assembly: AssemblyProduct("")>]
+[<assembly: AssemblyCopyright("gburri")>]
+[<assembly: AssemblyTrademark("")>]
+
+// The assembly version has the format {Major}.{Minor}.{Build}.{Revision}
+
+[<assembly: AssemblyVersion("1.0.0.0")>]
+
+//[<assembly: AssemblyDelaySign(false)>]
+//[<assembly: AssemblyKeyFile("")>]
+
+()
+
--- /dev/null
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+ <PropertyGroup>
+ <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+ <Platform Condition=" '$(Platform)' == '' ">x86</Platform>
+ <ProjectGuid>{E7DC4EE2-C349-4535-85C8-4EF519523148}</ProjectGuid>
+ <OutputType>Exe</OutputType>
+ <RootNamespace>Assignment_07FSharp</RootNamespace>
+ <AssemblyName>Assignment_07-FSharp</AssemblyName>
+ </PropertyGroup>
+ <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
+ <DebugSymbols>true</DebugSymbols>
+ <DebugType>full</DebugType>
+ <Optimize>false</Optimize>
+ <OutputPath>bin\Debug</OutputPath>
+ <DefineConstants>DEBUG</DefineConstants>
+ <ErrorReport>prompt</ErrorReport>
+ <Externalconsole>true</Externalconsole>
+ <Tailcalls>false</Tailcalls>
+ <PlatformTarget>x86</PlatformTarget>
+ </PropertyGroup>
+ <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
+ <DebugSymbols>false</DebugSymbols>
+ <DebugType>none</DebugType>
+ <Optimize>true</Optimize>
+ <OutputPath>bin\Release</OutputPath>
+ <ErrorReport>prompt</ErrorReport>
+ <PlatformTarget>x86</PlatformTarget>
+ <Externalconsole>true</Externalconsole>
+ <Tailcalls>true</Tailcalls>
+ </PropertyGroup>
+ <ItemGroup>
+ <Reference Include="mscorlib" />
+ <Reference Include="FSharp.Core" />
+ <Reference Include="System" />
+ <Reference Include="System.Core" />
+ <Reference Include="System.Numerics" />
+ </ItemGroup>
+ <ItemGroup>
+ <Compile Include="AssemblyInfo.fs" />
+ <Compile Include="Program.fs" />
+ </ItemGroup>
+ <Import Project="$(MSBuildExtensionsPath32)\..\Microsoft SDKs\F#\3.1\Framework\v4.0\Microsoft.FSharp.Targets" />
+</Project>
\ No newline at end of file
--- /dev/null
+open System
+
+// Question 1.
+type Stack<'a> =
+ | Elem of 'a * Stack<'a>
+ | Empty
+ member this.Push a = Elem (a, this)
+ member this.Top =
+ match this with
+ | Elem (a, _) -> a
+ | Empty -> failwith "Empty stack!"
+ member this.Pop =
+ match this with
+ | Elem (_, rest) -> rest
+ | Empty -> failwith "Empty stack!"
+ override this.ToString () =
+ match this with
+ | Elem (e, rest) -> e.ToString() + "," + rest.ToString()
+ | Empty -> "Empty"
+
+type Foo () = class end
+type Bar () = inherit Foo ()
+
+let question1 () =
+ printfn "Question 1"
+ let a = (((Empty.Push "hello").Push "world").Push "it's fun").Pop
+ printfn "a: %O" a
+ assert (a.ToString () = "world,hello,Empty")
+
+ let b = ((Empty.Push 1).Push 3)
+ printfn "b.Top: %O" b.Top
+ assert (b.Top = 3)
+
+ let c : Stack<Bar> = (Empty.Push <| Bar ()).Push <| Bar ()
+ printfn "%A" <|
+ match c.Top with
+ | :? Bar -> true
+ | _ -> false
+
+ let d : Stack<#Foo> = (Empty.Push <| Bar ()).Push <| Bar ()
+ printfn "%A" <|
+ match d.Top with
+ | :? Bar -> true
+ | _ -> false
+
+// Question 4.
+let question4 () =
+ let rec primesSieve sequence =
+ seq {
+ let h = Seq.head sequence
+ yield h
+ yield! primesSieve <| Seq.filter (fun m -> m % h <> 0) sequence
+ }
+ let primes = primesSieve <| (Seq.initInfinite id |> Seq.skip 2)
+ printfn "first primes: %A" <| (Seq.take 100 primes |> Seq.toList)
+
+[<EntryPoint>]
+let main argv =
+ question1 ()
+ question4 ()
+ 0
+
--- /dev/null
+<?xml version="1.0" encoding="UTF-8"?>
+<module external.linked.project.id="assignment_07-build" external.linked.project.path="$MODULE_DIR$/../../project" external.root.project.path="$MODULE_DIR$/../.." external.system.id="SBT" sbt.imports="sbt._, Keys._, dsl._, _root_.sbt.plugins.IvyPlugin, _root_.sbt.plugins.JvmPlugin, _root_.sbt.plugins.CorePlugin, _root_.sbt.plugins.JUnitXmlReportPlugin" sbt.resolvers="https://repo1.maven.org/maven2/|maven|public, /home/gburri/.ivy2/cache|ivy|Local cache" type="SBT_MODULE" version="4">
+ <component name="NewModuleRootManager" inherit-compiler-output="false">
+ <output url="file://$MODULE_DIR$/../../project/target/idea-classes" />
+ <output-test url="file://$MODULE_DIR$/../../project/target/idea-test-classes" />
+ <exclude-output />
+ <content url="file://$MODULE_DIR$/../../project">
+ <sourceFolder url="file://$MODULE_DIR$/../../project" isTestSource="false" />
+ <excludeFolder url="file://$MODULE_DIR$/../../project/project/target" />
+ <excludeFolder url="file://$MODULE_DIR$/../../project/target" />
+ </content>
+ <orderEntry type="inheritedJdk" />
+ <orderEntry type="sourceFolder" forTests="false" />
+ <orderEntry type="module-library">
+ <library name="SBT: sbt-and-plugins">
+ <CLASSES>
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/persist-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/run-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/command-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/classpath-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/process-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/sbinary_2.10-0.4.2.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/compiler-ivy-integration-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/compile-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/jsch-0.1.46.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/apply-macro-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/json4s-support_2.10-0.6.0.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/io-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/compiler-integration-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/ivy-2.3.0-sbt-fccfbd44c9f64523b61398a0155784dcbaeae28f.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/json4s-ast_2.10-3.2.10.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/cross-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/lib/scala-reflect.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/lib/scala-compiler.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/logic-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/jline-2.11.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/logging-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/xsbti/interface-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/scala-reflect-2.10.4.jar!/" />
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+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/collections-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/control-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/actions-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/lib/jline.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/main-settings-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/sbt-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/testing-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/task-system-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/incremental-compiler-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/test-interface-1.0.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/lib/scala-library.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/lib/jansi.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/main-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/paranamer-2.6.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/tracking-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/test-agent-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/json4s-core_2.10-3.2.10.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/relation-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/tasks-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/completion-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/jawn-parser_2.10-0.6.0.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/launcher-interface-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/quasiquotes_2.10-2.0.1.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/api-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/classfile-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/ivy-0.13.8.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/scala-pickling_2.10-0.10.0.jar!/" />
+ <root url="jar://$USER_HOME$/.sbt/boot/scala-2.10.4/org.scala-sbt/sbt/0.13.8/serialization_2.10-0.1.1.jar!/" />
+ </CLASSES>
+ <JAVADOC />
+ <SOURCES>
+ <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-sbt/actions/srcs/actions-0.13.8-sources.jar!/" />
+ <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-sbt/task-system/srcs/task-system-0.13.8-sources.jar!/" />
+ <root url="jar://$USER_HOME$/.ivy2/cache/org.spire-math/jawn-parser_2.10/srcs/jawn-parser_2.10-0.6.0-sources.jar!/" />
+ <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-sbt/test-agent/srcs/test-agent-0.13.8-sources.jar!/" />
+ <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-sbt/classfile/srcs/classfile-0.13.8-sources.jar!/" />
+ <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-sbt/command/srcs/command-0.13.8-sources.jar!/" />
+ <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-sbt/apply-macro/srcs/apply-macro-0.13.8-sources.jar!/" />
+ <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-lang/scala-compiler/srcs/scala-compiler-2.10.4-sources.jar!/" />
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+ <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-tools.sbinary/sbinary_2.10/srcs/sbinary_2.10-0.4.2-sources.jar!/" />
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+ <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-sbt/cross/srcs/cross-0.13.8-sources.jar!/" />
+ <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-sbt/precompiled-2_8_2/srcs/precompiled-2_8_2-0.13.8-sources.jar!/" />
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+ <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-sbt/control/srcs/control-0.13.8-sources.jar!/" />
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+ <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-sbt/completion/srcs/completion-0.13.8-sources.jar!/" />
+ <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-sbt/io/srcs/io-0.13.8-sources.jar!/" />
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+ <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-sbt/testing/srcs/testing-0.13.8-sources.jar!/" />
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+ <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-sbt/precompiled-2_9_2/srcs/precompiled-2_9_2-0.13.8-sources.jar!/" />
+ <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-sbt/compiler-integration/srcs/compiler-integration-0.13.8-sources.jar!/" />
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+ <root url="jar://$USER_HOME$/.ivy2/cache/org.scala-sbt/main/srcs/main-0.13.8-sources.jar!/" />
+ </SOURCES>
+ </library>
+ </orderEntry>
+ </component>
+</module>
\ No newline at end of file
--- /dev/null
+<?xml version="1.0" encoding="UTF-8"?>
+<module external.linked.project.id="assignment_07" external.linked.project.path="$MODULE_DIR$/../.." external.root.project.path="$MODULE_DIR$/../.." external.system.id="SBT" type="JAVA_MODULE" version="4">
+ <component name="NewModuleRootManager" inherit-compiler-output="false">
+ <output url="file://$MODULE_DIR$/../../target/scala-2.11/classes" />
+ <output-test url="file://$MODULE_DIR$/../../target/scala-2.11/test-classes" />
+ <exclude-output />
+ <content url="file://$MODULE_DIR$/../..">
+ <sourceFolder url="file://$MODULE_DIR$/../../src/main/java" isTestSource="false" />
+ <sourceFolder url="file://$MODULE_DIR$/../../src/main/scala" isTestSource="false" />
+ <sourceFolder url="file://$MODULE_DIR$/../../src/main/scala-2.11" isTestSource="false" />
+ <sourceFolder url="file://$MODULE_DIR$/../../target/scala-2.11/src_managed/main" isTestSource="false" />
+ <sourceFolder url="file://$MODULE_DIR$/../../src/test/java" isTestSource="true" />
+ <sourceFolder url="file://$MODULE_DIR$/../../src/test/scala" isTestSource="true" />
+ <sourceFolder url="file://$MODULE_DIR$/../../src/test/scala-2.11" isTestSource="true" />
+ <sourceFolder url="file://$MODULE_DIR$/../../target/scala-2.11/src_managed/test" isTestSource="true" />
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+ <sourceFolder url="file://$MODULE_DIR$/../../src/test/resources" type="java-test-resource" />
+ <sourceFolder url="file://$MODULE_DIR$/../../target/scala-2.11/resource_managed/test" type="java-test-resource" />
+ <excludeFolder url="file://$MODULE_DIR$/../../target" />
+ </content>
+ <orderEntry type="inheritedJdk" />
+ <orderEntry type="sourceFolder" forTests="false" />
+ <orderEntry type="library" name="SBT: org.scala-lang:scala-library:2.11.6:jar" level="project" />
+ </component>
+</module>
\ No newline at end of file
--- /dev/null
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+ <component name="CompilerConfiguration">
+ <option name="DEFAULT_COMPILER" value="Javac" />
+ <resourceExtensions />
+ <wildcardResourcePatterns>
+ <entry name="!?*.java" />
+ <entry name="!?*.form" />
+ <entry name="!?*.class" />
+ <entry name="!?*.groovy" />
+ <entry name="!?*.scala" />
+ <entry name="!?*.flex" />
+ <entry name="!?*.kt" />
+ <entry name="!?*.clj" />
+ <entry name="!?*.aj" />
+ </wildcardResourcePatterns>
+ <annotationProcessing>
+ <profile default="true" name="Default" enabled="false">
+ <processorPath useClasspath="true" />
+ </profile>
+ </annotationProcessing>
+ </component>
+ <component name="CopyrightManager" default="" />
+ <component name="MavenImportPreferences">
+ <option name="generalSettings">
+ <MavenGeneralSettings>
+ <option name="mavenHome" value="Bundled (Maven 3)" />
+ </MavenGeneralSettings>
+ </option>
+ </component>
+ <component name="ProjectLevelVcsManager" settingsEditedManually="false">
+ <OptionsSetting value="true" id="Add" />
+ <OptionsSetting value="true" id="Remove" />
+ <OptionsSetting value="true" id="Checkout" />
+ <OptionsSetting value="true" id="Update" />
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+ <breakpoint-manager />
+ <watches-manager />
+ </component>
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+ <option name="IS_AUTOSCROLL_TO_SOURCE" value="false" />
+ <option name="FILTER_TARGETS" value="false" />
+ </component>
+ <component name="editorHistoryManager">
+ <entry file="file://$PROJECT_DIR$/src/main/scala/Main.scala">
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+ <list>
+ <option value="0.2" />
+ </list>
+ </option>
+ </splitter-proportions>
+ </settings>
+ </state>
+ <state key="FacetStructureConfigurable.UI">
+ <settings>
+ <last-edited>No facets are configured</last-edited>
+ <splitter-proportions>
+ <option name="proportions">
+ <list>
+ <option value="0.2" />
+ </list>
+ </option>
+ </splitter-proportions>
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+ <last-edited>1.8</last-edited>
+ <splitter-proportions>
+ <option name="proportions">
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+ <option value="0.2" />
+ </list>
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+ <last-edited>assignment_07</last-edited>
+ <splitter-proportions>
+ <option name="proportions">
+ <list>
+ <option value="0.2" />
+ <option value="0.6" />
+ </list>
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+ <splitter-proportions>
+ <option name="proportions">
+ <list>
+ <option value="0.2" />
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\ No newline at end of file
--- /dev/null
+name := "Assignment_07"
+
+version := "1.0"
+
+scalaVersion := "2.11.6"
+
\ No newline at end of file
--- /dev/null
+sbt.version = 0.13.8
\ No newline at end of file
--- /dev/null
+logLevel := Level.Warn
\ No newline at end of file
--- /dev/null
+object Main {
+
+ // Question 1.
+ trait Stack[+A] {
+ def push[B >: A](elem: B): Stack[B]
+ def top: A
+ def pop: Stack[A]
+ }
+
+ case class EmptyStack[A]() extends Stack[A] {
+ def push[B >: A](elem: B): Stack[B] = ElemStack(elem, this)
+ def top: A = throw new Exception
+ def pop: Stack[A] = throw new Exception
+ }
+
+ case class ElemStack[A](top: A, rest: Stack[A]) extends Stack[A] {
+ def push[B >: A](elem: B): Stack[B] = ElemStack(elem, this)
+ def pop: Stack[A] = rest
+ override def toString = s"${top.toString()},${rest.toString()}"
+ }
+
+ def question1 = {
+ println("Question 1")
+ // Construction, pop and toString.
+ val a = EmptyStack().push("hello").push("world").push("it's fun").pop
+ println(s"a: ${a}")
+ assert(a.toString() == "world,hello,EmptyStack()")
+
+ // Getting top.
+ val b = EmptyStack().push(1).push(3)
+ println(s"b.top: ${b.top}")
+ assert(b.top == 3)
+
+ // Variance checks.
+ class Foo
+ class Bar extends Foo
+ val c: Stack[Bar] = EmptyStack().push(new Bar()).push(new Bar())
+ assert(c.top.isInstanceOf[Bar])
+ assert(c.top.isInstanceOf[Foo])
+
+ // Variance check 2.
+ val d: Stack[Foo] = EmptyStack().push(new Bar()).push(new Bar())
+ assert(d.top.isInstanceOf[Foo])
+ }
+
+ // Question 2.
+ abstract sealed class Temperature {
+ val temp: Double
+ }
+
+ case class Celsius(v: Double) extends Temperature {
+ val temp = v
+ override def toString = s"$v° C"
+ }
+
+ case class Kelvin(v: Double) extends Temperature {
+ val temp = v
+ override def toString = s"$v° K"
+ }
+
+ object Temperature {
+ implicit def toCelsius(temp: Kelvin): Celsius = new Celsius(temp.v + 273.15)
+ implicit def toCelsius(temp: Int): Celsius = new Celsius(temp)
+ implicit def toKelvin(temp: Celsius): Kelvin = new Kelvin(temp.v - 273.15)
+ implicit def toKelvin(temp: Int): Kelvin = new Kelvin(temp)
+ }
+
+ def question2 = {
+ println("Question 2")
+ val a: Celsius = 30
+ val b: Kelvin = 30
+ val c: Kelvin = Celsius(10)
+ val d: Celsius = c
+ val e: Temperature = d
+ println(a)
+ println(b)
+ println(e)
+ }
+
+ // Question 3.
+ def addStream(s1: Stream[Int], s2: Stream[Int]): Stream[Int] =
+ (s1.head + s2.head) #:: addStream(s1.tail, s2.tail)
+
+ lazy val fib: Stream[Int] = 0 #:: 1 #:: addStream(fib, fib.tail)
+
+ def question3 = {
+ println(fib.take(30).toList)
+ }
+
+ def main(args: Array[String]): Unit = {
+ question1
+ question2
+ question3
+ }
+}
projects / Scala.git / commitdiff