Add swift-scheduling exercise

config.json

@@ -2704,6 +2704,20 @@
           "for-loops"
         ],
         "difficulty": 7
+      },
+      {
+        "slug": "swift-scheduling",
+        "name": "swift-scheduling",
+        "uuid": "0eb21dfc-9666-475c-bc92-558f2663a598",
+        "practices": [
+          "datetimes",
+          "string-formatting"
+        ],
+        "prerequisites": [
+          "datetimes",
+          "string-formatting"
+        ],
+        "difficulty": 6
       }
     ],
     "foregone": [

exercises/Exercises.sln

@@ -355,6 +355,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Satellite", "practice\satel
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StateOfTicTacToe", "practice\state-of-tic-tac-toe\StateOfTicTacToe.csproj", "{67E9BAB3-9805-42F1-9298-E9BBB795140E}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "SwiftScheduling", "practice\swift-scheduling\SwiftScheduling.csproj", "{751105AD-11F9-4FA7-B38C-A5D9225F1793}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -1057,6 +1059,10 @@ Global
 		{67E9BAB3-9805-42F1-9298-E9BBB795140E}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{67E9BAB3-9805-42F1-9298-E9BBB795140E}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{67E9BAB3-9805-42F1-9298-E9BBB795140E}.Release|Any CPU.Build.0 = Release|Any CPU
+		{751105AD-11F9-4FA7-B38C-A5D9225F1793}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{751105AD-11F9-4FA7-B38C-A5D9225F1793}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{751105AD-11F9-4FA7-B38C-A5D9225F1793}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{751105AD-11F9-4FA7-B38C-A5D9225F1793}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -1236,6 +1242,7 @@ Global
 		{BEBBD420-075D-46F1-AE51-CC9A05FECE4A} = {E276EF69-669A-43E0-88AC-8ABB17A9C026}
 		{8E276065-1371-4CFA-BA20-95225EC6AEBC} = {E276EF69-669A-43E0-88AC-8ABB17A9C026}
 		{67E9BAB3-9805-42F1-9298-E9BBB795140E} = {E276EF69-669A-43E0-88AC-8ABB17A9C026}
+		{751105AD-11F9-4FA7-B38C-A5D9225F1793} = {E276EF69-669A-43E0-88AC-8ABB17A9C026}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {AB4EA6C9-5461-4024-BDC7-2AE0C3A85CD1}

exercises/practice/swift-scheduling/.docs/instructions.md

@@ -0,0 +1,40 @@
+# Instructions
+
+Your task is to convert delivery date descriptions to _actual_ delivery dates, based on when the meeting started.
+
+There are two types of delivery date descriptions:
+
+1. Fixed: a predefined set of words.
+2. Variable: words that have a variable component, but follow a predefined set of patterns.
+
+## Fixed delivery date descriptions
+
+There are three fixed delivery date descriptions:
+
+- `"NOW"`
+- `"ASAP"` (As Soon As Possible)
+- `"EOW"` (End Of Week)
+
+The following table lists how to translate them:
+
+| Description | Meeting start                | Delivery date                       |
+| ----------- | ---------------------------- | ----------------------------------- |
+| `"NOW"`     | -                            | Two hours after the meeting started |
+| `"ASAP"`    | Before 12:00                 | Today at 17:00                      |
+| `"ASAP"`    | After 12:00                  | Tomorrow at 12:00                   |
+| `"EOW"`     | Monday, Tuesday or Wednesday | Friday at 5:00                      |
+| `"EOW"`     | Thursday or Friday           | Sunday at 20:00                     |
+
+## Variable delivery date descriptions
+
+There are two variable delivery date description patterns:
+
+- `"<N>M"` (N-th month)
+- `"Q<N>"` (N-th quarter)
+
+| Description | Delivery date                                                          |
+| ----------- | ---------------------------------------------------------------------- |
+| `"<N>M"`    | At 8:00 on the _first_ work day<sup>1</sup> of this year's N-th month  |
+| `"Q<N>"`    | At 8:00 on the _last_ work day<sup>1</sup> of this year's N-th quarter |
+
+<sup>1</sup> A work day is either a Monday, Tuesday, Wednesday, Thursday or Friday.

exercises/practice/swift-scheduling/.docs/introduction.md

@@ -0,0 +1,6 @@
+# Introduction
+
+This week, it is your turn to take notes in your department's planning meeting.
+In this meeting, your boss will set delivery dates for all open work items.
+Annoyingly, instead of specifying the _actual_ delivery date, your boss will only _describe them_.
+It is your task to convert these (short) descriptions to actual delivery dates.

exercises/practice/swift-scheduling/.editorconfig

@@ -0,0 +1,141 @@
+###############################
+# Core EditorConfig Options   #
+###############################
+
+; This file is for unifying the coding style for different editors and IDEs.
+; More information at:
+; https://docs.microsoft.com/en-us/visualstudio/ide/editorconfig-code-style-settings-reference?view=vs-2017
+; https://docs.microsoft.com/en-us/visualstudio/ide/create-portable-custom-editor-options?view=vs-2017
+
+root = true
+
+[*]
+indent_style = space
+
+[SwiftScheduling.cs]
+indent_size = 4
+
+###############################
+# .NET Coding Conventions     #
+###############################
+
+# Organize usings
+dotnet_sort_system_directives_first = true
+dotnet_separate_import_directive_groups = true
+
+# this. preferences
+dotnet_style_qualification_for_field = false:suggestion
+dotnet_style_qualification_for_property = false:suggestion
+dotnet_style_qualification_for_method = false:suggestion
+dotnet_style_qualification_for_event = false:suggestion
+
+# Language keywords vs BCL types preferences
+dotnet_style_predefined_type_for_locals_parameters_members = true:suggestion
+dotnet_style_predefined_type_for_member_access = true:suggestion
+
+# Parentheses preferences
+dotnet_style_parentheses_in_arithmetic_binary_operators = never_if_unnecessary:none
+dotnet_style_parentheses_in_relational_binary_operators = never_if_unnecessary:none
+dotnet_style_parentheses_in_other_binary_operators = never_if_unnecessary:none
+dotnet_style_parentheses_in_other_operators = never_if_unnecessary:suggestion
+
+# Modifier preferences
+dotnet_style_require_accessibility_modifiers = always:suggestion
+dotnet_style_readonly_field = true:suggestion
+
+# Expression-level preferences
+dotnet_style_object_initializer = true:suggestion
+dotnet_style_collection_initializer = true:suggestion
+dotnet_style_explicit_tuple_names = true:suggestion
+dotnet_style_prefer_inferred_tuple_names = true:suggestion
+dotnet_style_prefer_inferred_anonymous_type_member_names = true:suggestion
+dotnet_style_prefer_auto_properties = true:suggestion
+dotnet_style_prefer_is_null_check_over_reference_equality_method = true:suggestion
+dotnet_style_prefer_conditional_expression_over_assignment = true:suggestion
+dotnet_style_prefer_conditional_expression_over_return = true:suggestion
+dotnet_style_coalesce_expression = true:suggestion
+dotnet_style_null_propagation = true:suggestion
+
+###############################
+# Naming Conventions          #
+###############################
+
+# Style Definitions
+dotnet_naming_style.pascal_case_style.capitalization = pascal_case
+
+# Use PascalCase for constant fields
+dotnet_naming_rule.constant_fields_should_be_pascal_case.severity = suggestion
+dotnet_naming_rule.constant_fields_should_be_pascal_case.symbols = constant_fields
+dotnet_naming_rule.constant_fields_should_be_pascal_case.style = pascal_case_style
+dotnet_naming_symbols.constant_fields.applicable_kinds = field
+dotnet_naming_symbols.constant_fields.applicable_accessibilities = *
+dotnet_naming_symbols.constant_fields.required_modifiers = const
+
+###############################
+# C# Code Style Rules         #
+###############################
+
+# var preferences
+csharp_style_var_for_built_in_types = true:none
+csharp_style_var_when_type_is_apparent = true:none
+csharp_style_var_elsewhere = true:none
+
+# Expression-bodied members
+csharp_style_expression_bodied_methods = true:suggestion
+csharp_style_expression_bodied_constructors = true:suggestion
+csharp_style_expression_bodied_operators = true:suggestion
+csharp_style_expression_bodied_properties = true:suggestion
+csharp_style_expression_bodied_indexers = true:suggestion
+csharp_style_expression_bodied_accessors = true:suggestion
+
+# Pattern-matching preferences
+csharp_style_pattern_matching_over_is_with_cast_check = true:suggestion
+csharp_style_pattern_matching_over_as_with_null_check = true:suggestion
+
+# Null-checking preferences
+csharp_style_throw_expression = true:suggestion
+csharp_style_conditional_delegate_call = true:suggestion
+
+# Modifier preferences
+csharp_preferred_modifier_order = public,private,protected,internal,static,extern,new,virtual,abstract,sealed,override,readonly,unsafe,volatile,async:suggestion
+
+# Expression-level preferences
+csharp_prefer_braces = true:none
+csharp_prefer_simple_default_expression = true:suggestion
+csharp_style_deconstructed_variable_declaration = true:suggestion
+csharp_style_pattern_local_over_anonymous_function = true:suggestion
+csharp_style_inlined_variable_declaration = true:suggestion
+
+###############################
+# C# Formatting Rules         #
+###############################
+
+# New line preferences
+csharp_new_line_before_open_brace = all
+csharp_new_line_before_else = true
+csharp_new_line_before_catch = true
+csharp_new_line_before_finally = true
+csharp_new_line_before_members_in_object_initializers = false
+csharp_new_line_before_members_in_anonymous_types = false
+csharp_new_line_between_query_expression_clauses = true
+
+# Indentation preferences
+csharp_indent_case_contents = true
+csharp_indent_switch_labels = true
+csharp_indent_labels = flush_left
+
+# Space preferences
+csharp_space_after_cast = false
+csharp_space_after_keywords_in_control_flow_statements = true
+csharp_space_between_method_declaration_parameter_list_parentheses = false
+csharp_space_between_method_call_parameter_list_parentheses = false
+csharp_space_before_colon_in_inheritance_clause = true
+csharp_space_after_colon_in_inheritance_clause = true
+csharp_space_around_binary_operators = before_and_after
+csharp_space_between_method_declaration_empty_parameter_list_parentheses = false
+csharp_space_between_method_call_name_and_opening_parenthesis = false
+csharp_space_between_method_call_empty_parameter_list_parentheses = false
+
+# Wrapping preferences
+csharp_preserve_single_line_blocks = true
+csharp_preserve_single_line_statements = true

exercises/practice/swift-scheduling/.meta/Example.cs

@@ -0,0 +1,33 @@
+public static class SwiftScheduling
+{
+    public static DateTime DeliveryDate(DateTime meetingStart, string description) =>
+        description switch
+        {
+            "NOW" => meetingStart.AddHours(2),
+            "ASAP" when meetingStart.Hour <= 12 => meetingStart.AtHour(17),
+            "ASAP" => meetingStart.AddDays(1).AtHour(12),
+            "EOW" => meetingStart.DayOfWeek switch
+            {
+                DayOfWeek.Thursday or DayOfWeek.Friday => meetingStart.AddDays(7 - (int)meetingStart.DayOfWeek).AtHour(20),
+                _ => meetingStart.AddDays(DayOfWeek.Friday - meetingStart.DayOfWeek).AtHour(17),
+            }, 
+            _  when description.EndsWith('M') => meetingStart.NthMonth(int.Parse(description[..^1])).FirstWorkDay().AtHour(8),
+            _  when description.StartsWith('Q') => meetingStart.NthQuarter(int.Parse(description[1..])).LastWorkDay().AtHour(8),
+            _ => throw new ArgumentException("Invalid date"),
+        };
+
+    private static DateTime NthMonth(this DateTime date, int n) => new(date.Year, n, 1);
+
+    private static DateTime NthQuarter(this DateTime date, int n) => new(date.Year, n * 3, 1);
+
+    private static IEnumerable<DateTime> WorkDays(this DateTime date) =>
+        Enumerable.Range(1, DateTime.DaysInMonth(date.Year, date.Month))
+            .Select(day => new DateTime(date.Year, date.Month, day))
+            .Where(d => d.DayOfWeek is not DayOfWeek.Saturday and not DayOfWeek.Sunday);
+
+    private static DateTime FirstWorkDay(this DateTime date) => date.WorkDays().First();
+
+    private static DateTime LastWorkDay(this DateTime date) => date.WorkDays().Last();
+
+    private static DateTime AtHour(this DateTime date, int hour) => date.Date.AddHours(hour);
+}

exercises/practice/swift-scheduling/.meta/config.json

@@ -0,0 +1,17 @@
+{
+  "authors": [
+    "erikschierboom"
+  ],
+  "files": {
+    "solution": [
+      "SwiftScheduling.cs"
+    ],
+    "test": [
+      "SwiftSchedulingTests.cs"
+    ],
+    "example": [
+      ".meta/Example.cs"
+    ]
+  },
+  "blurb": "Convert delivery date descriptions to actual delivery dates."
+}

exercises/practice/swift-scheduling/SwiftScheduling.cs

@@ -0,0 +1,7 @@
+public static class SwiftScheduling
+{
+    public static DateTime DeliveryDate(DateTime meetingStart, string description) =>
+    {
+        throw new NotImplementedException("You need to implement this method.");
+    }
+}

exercises/practice/swift-scheduling/SwiftScheduling.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <OutputType>Exe</OutputType>
+    <RootNamespace>SwiftScheduling</RootNamespace>
+    <TargetFramework>net8.0</TargetFramework>
+  </PropertyGroup>
+  <ItemGroup>
+    <Using Include="Xunit" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
+    <PackageReference Include="xunit.v3" Version="1.1.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="3.0.2" />
+  </ItemGroup>
+</Project>