Daniel Klatt Interview

.gitignore

@@ -1,9 +1 @@
-.classpath
-.project
-.settings/
-target/
-nbproject/*
-.settings
-runtime/*
-*~
 .DS_Store

elixir_solution/.formatter.exs

@@ -0,0 +1,4 @@
+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

elixir_solution/.gitignore

@@ -0,0 +1,27 @@
+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+interview-*.tar
+
+
+# Temporary files for e.g. tests
+/tmp

elixir_solution/README.md

@@ -0,0 +1,21 @@
+# Interview
+
+The elixir way of solving the interview problems in the java coding challenge
+
+## Installation
+
+If [available in Hex](https://hex.pm/docs/publish), the package can be installed
+by adding `interview` to your list of dependencies in `mix.exs`:
+
+```elixir
+def deps do
+  [
+    {:interview, "~> 0.1.0"}
+  ]
+end
+```
+
+Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
+and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
+be found at [https://hexdocs.pm/interview](https://hexdocs.pm/interview).
+

elixir_solution/lib/interview.ex

@@ -0,0 +1,15 @@
+defmodule Interview do
+  def convertToTitleCase(string) when is_binary(string) do
+    string
+    |> String.split(~r/[^[:alnum:]]/u, trim: true)
+    |> Enum.map(&String.capitalize/1)
+    |> Enum.join(" ")
+  end
+
+  def convertUnixToDateString(seconds \\ DateTime.to_unix(DateTime.now!("Etc/UTC")))
+      when is_integer(seconds) do
+    seconds
+    |> DateTime.from_unix!()
+    |> Calendar.strftime("%B %-d, %Y")
+  end
+end

elixir_solution/mix.exs

@@ -0,0 +1,28 @@
+defmodule Interview.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :interview,
+      version: "0.1.0",
+      elixir: "~> 1.11",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
+    ]
+  end
+end

elixir_solution/test/interview_test.exs

@@ -0,0 +1,41 @@
+defmodule InterviewTest do
+  use ExUnit.Case
+
+  describe "Title Case Tests" do
+    test "basic string" do
+      assert Interview.convertToTitleCase("TITLE_CASE") == "Title Case"
+    end
+
+    test "properly handles numbers" do
+      assert Interview.convertToTitleCase("NUMBER_3") == "Number 3"
+    end
+
+    test "properly handles hyphens" do
+      assert Interview.convertToTitleCase("TRUTH-TRACK") == "Truth Track"
+    end
+
+    test "extra test case from instruction file" do
+      assert Interview.convertToTitleCase("CASE-THREE_extra[chars]///") ==
+               "Case Three Extra Chars"
+    end
+
+    test "throws exception when passed null" do
+      assert_raise FunctionClauseError, fn -> Interview.convertToTitleCase(nil) end
+    end
+  end
+
+  describe "Date String Tests" do
+    test "test date converstion" do
+      assert Interview.convertUnixToDateString(1_499_144_400) == "July 4, 2017"
+    end
+
+    test "throws exception when passed null" do
+      assert_raise FunctionClauseError, fn -> Interview.convertUnixToDateString(nil) end
+    end
+
+    test "defaults to today" do
+      today = Calendar.strftime(DateTime.now!("Etc/UTC"), "%B %-d, %Y")
+      assert Interview.convertUnixToDateString() == today
+    end
+  end
+end

elixir_solution/test/test_helper.exs

@@ -0,0 +1 @@
+ExUnit.start()

java_solution/.gitignore

@@ -0,0 +1,9 @@
+.classpath
+.project
+.settings/
+target/
+nbproject/*
+.settings
+runtime/*
+*~
+.DS_Store

java_solution/src/main/java/com/github/archarithms/App.java

@@ -0,0 +1,47 @@
+package com.github.archarithms;
+
+import java.time.LocalDateTime;
+import java.time.ZoneOffset;
+import java.time.format.DateTimeFormatter;
+
+public class App
+{
+  public static String convertToTitleCase(final String inpStr) throws Exception
+  {
+    if (inpStr == null) {
+      throw new Exception();
+    }
+
+    String[] words = inpStr.split("[^a-zA-Z0-9]");
+    for (int i = 0; i < words.length; i++) {
+      String word = words[i];
+      String head = word.substring(0, 1);
+      String tail = word.substring(1);
+      words[i] = head.toUpperCase() + tail.toLowerCase();
+    }
+    return String.join(" ", words);
+  }
+
+  public static String convertUnixToDateString() throws Exception
+  {
+    Long seconds = LocalDateTime.now().toEpochSecond(ZoneOffset.UTC);
+
+    return convertUnixToDateString(seconds);
+  }
+
+  public static String convertUnixToDateString(final Long inpUnixSeconds) throws Exception
+  {
+    if (inpUnixSeconds == null) {
+      throw new Exception();
+    }
+
+    LocalDateTime date = LocalDateTime.ofEpochSecond(inpUnixSeconds, 0, ZoneOffset.UTC);
+    DateTimeFormatter formatter = patternedFormatter();
+
+    return date.format(formatter);
+  }
+
+  public static DateTimeFormatter patternedFormatter() {
+    return DateTimeFormatter.ofPattern("MMMM d, yyyy");
+  }
+}

src/test/java/com/github/archarithms/test/DateStringTests.java → java_solution/src/test/java/com/github/archarithms/test/DateStringTests.java

@@ -7,6 +7,9 @@
 
 import com.github.archarithms.App;
 
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+
 /**
  * DateStringTests unit tests for simple App.
  */
@@ -21,7 +24,7 @@ public class DateStringTests
      * Test the testConvertUnixToDateString method
      */
     @Test
-    public void testConvertUnixToDateString() {
+    public void testConvertUnixToDateString() throws Exception {
         String testStr = "July 4, 2017";
         assertTrue(testStr.equals(App.convertUnixToDateString(1499144400L)));
     }
@@ -30,7 +33,17 @@ public void testConvertUnixToDateString() {
      * Test the testNullCase method
      */
     @Test
-    public void testNullCase() {
+    public void testNullCase() throws Exception {
         assertThrows(Exception.class, () -> App.convertUnixToDateString(null));
     }
+
+    /**
+     * Test the testDefaultCase method
+     */
+    @Test
+    public void testDefaultCase() throws Exception {
+        LocalDateTime date = LocalDateTime.now();
+        DateTimeFormatter formatter = App.patternedFormatter();
+        assertTrue(date.format(formatter).equals(App.convertUnixToDateString()));
+    }
 }

src/test/java/com/github/archarithms/test/TitleCaseTests.java → java_solution/src/test/java/com/github/archarithms/test/TitleCaseTests.java

@@ -1,6 +1,7 @@
 package com.github.archarithms.test;
 
 import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.junit.jupiter.api.Assertions.assertThrows;
 
 import org.junit.jupiter.api.Test;
 
@@ -20,7 +21,7 @@ public class TitleCaseTests
      * Test the testConvertToTitleCase method
      */
     @Test
-    public void testConvertToTitleCase() {
+    public void testConvertToTitleCase() throws Exception {
         String testStr = "Title Case";
         assertTrue(testStr.equals(App.convertToTitleCase("TITLE_CASE")));
     }
@@ -29,7 +30,7 @@ public void testConvertToTitleCase() {
      * Test the testNumbers method
      */
     @Test
-    public void testNumbers() {
+    public void testNumbers() throws Exception {
         String testStr = "Number 3";
         assertTrue(testStr.equals(App.convertToTitleCase("NUMBER_3")));
     }
@@ -38,8 +39,25 @@ public void testNumbers() {
      * Test the testOtherChars method
      */
     @Test
-    public void testOtherChars() {
+    public void testOtherChars() throws Exception {
         String testStr = "Truth Track";
         assertTrue(testStr.equals(App.convertToTitleCase("TRUTH-TRACK")));
     }
+
+    /**
+     * Test the string provided in the instruction file
+     */
+    @Test
+    public void testInstructionString() throws Exception {
+        String testStr = "Case Three Extra Chars";
+        assertTrue(testStr.equals(App.convertToTitleCase("CASE-THREE_extra[chars]///")));
+    }
+
+    /**
+     * Test the testNullCase method
+     */
+    @Test
+    public void testNullCase() throws Exception {
+        assertThrows(Exception.class, () -> App.convertToTitleCase(null));
+    }
 }