PowerShell - leap, raindrops, reverse-string, two-fer

powershell/leap/.exercism/config.json

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+{
+  "blurb": "Given a year, report if it is a leap year.",
+  "authors": [
+    "spuder"
+  ],
+  "contributors": [
+    "gyssels",
+    "kchenery"
+  ],
+  "files": {
+    "solution": [
+      "LeapYear.ps1"
+    ],
+    "test": [
+      "LeapYear.tests.ps1"
+    ],
+    "example": [
+      ".meta/LeapYear.example.ps1"
+    ]
+  },
+  "source": "JavaRanch Cattle Drive, exercise 3",
+  "source_url": "http://www.javaranch.com/leap.jsp"
+}

powershell/leap/.exercism/metadata.json

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+{"track":"powershell","exercise":"leap","id":"0a3fd49cec7f4abab206a09b5accdf20","url":"https://exercism.org/tracks/powershell/exercises/leap","handle":"Xevion","is_requester":true,"auto_approve":false}

powershell/leap/.version

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+1

powershell/leap/HELP.md

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+# Help
+
+## Running the tests
+
+To run the tests run the command `Invoke-Pester` from within the exercise directory.
+
+## Submitting your solution
+
+You can submit your solution using the `exercism submit LeapYear.ps1` command.
+This command will upload your solution to the Exercism website and print the solution page's URL.
+
+It's possible to submit an incomplete solution which allows you to:
+
+- See how others have completed the exercise
+- Request help from a mentor
+
+## Need to get help?
+
+If you'd like help solving the exercise, check the following pages:
+
+- The [PowerShell track's documentation](https://exercism.org/docs/tracks/powershell)
+- [Exercism's support channel on gitter](https://gitter.im/exercism/support)
+- The [Frequently Asked Questions](https://exercism.org/docs/using/faqs)
+
+Should those resources not suffice, you could submit your (incomplete) solution to request mentoring.
+
+To get help if you are having trouble, you can use one of the following resources:
+
+- [Powershell Documentation][powershell docs]
+
+[Add more resources]: TODO
+
+[powershell docs]: https://docs.microsoft.com/en-us/powershell/

powershell/leap/LeapYear.ps1

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+function Test-LeapYear {
+    param( [int]$year )
+
+    if ((($year % 4 -eq 0) -and !($year % 100 -eq 0)) -or ($year % 400 -eq 0)) {
+        return $true
+    }
+    
+    return $false
+}

powershell/leap/LeapYear.tests.ps1

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+BeforeAll {
+    . ".\LeapYear.ps1"
+}
+
+Describe "LeapYear Tests" {
+    It "Year not divisible by 4: common year" {
+        Test-LeapYear(2015) | Should -Be $false
+    }
+
+    It "Year divisible by 4, not divisible by 100: leap year" {
+        Test-LeapYear(1996) | Should -Be $true
+    }
+
+    It "Year divisible by 100, not divisible by 400: common year" {
+        Test-LeapYear(2100) | Should -Be $false
+    }
+
+    It "Year divisible by 400: leap year" {
+        Test-LeapYear(2000) | Should -Be $true
+    }
+}

powershell/leap/README.md

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+# Leap
+
+Welcome to Leap on Exercism's PowerShell Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Given a year, report if it is a leap year.
+
+The tricky thing here is that a leap year in the Gregorian calendar occurs:
+
+```text
+on every year that is evenly divisible by 4
+  except every year that is evenly divisible by 100
+    unless the year is also evenly divisible by 400
+```
+
+For example, 1997 is not a leap year, but 1996 is.  1900 is not a leap
+year, but 2000 is.
+
+## Notes
+
+Though our exercise adopts some very simple rules, there is more to
+learn!
+
+For a delightful, four minute explanation of the whole leap year
+phenomenon, go watch [this youtube video][video].
+
+[video]: http://www.youtube.com/watch?v=xX96xng7sAE
+
+## Source
+
+### Created by
+
+- @spuder
+
+### Contributed to by
+
+- @gyssels
+- @kchenery
+
+### Based on
+
+JavaRanch Cattle Drive, exercise 3 - http://www.javaranch.com/leap.jsp