PowerShell - sum-of-multiples

powershell/sum-of-multiples/.exercism/config.json

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+{
+  "blurb": "Given a number, find the sum of all the multiples of particular numbers up to but not including that number.",
+  "authors": [
+    "gyssels"
+  ],
+  "contributors": [
+    "kchenery"
+  ],
+  "files": {
+    "solution": [
+      "SumOfMultiples.ps1"
+    ],
+    "test": [
+      "SumOfMultiples.tests.ps1"
+    ],
+    "example": [
+      ".meta/SumOfMultiples.example.ps1"
+    ]
+  },
+  "source": "A variation on Problem 1 at Project Euler",
+  "source_url": "http://projecteuler.net/problem=1"
+}

powershell/sum-of-multiples/.exercism/metadata.json

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+{"track":"powershell","exercise":"sum-of-multiples","id":"e24485af466b4525bced020dc247d87c","url":"https://exercism.org/tracks/powershell/exercises/sum-of-multiples","handle":"Xevion","is_requester":true,"auto_approve":false}

powershell/sum-of-multiples/.version

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+0

powershell/sum-of-multiples/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 SumOfMultiples.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/sum-of-multiples/README.md

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+# Sum Of Multiples
+
+Welcome to Sum Of Multiples on Exercism's PowerShell Track.
+If you need help running the tests or submitting your code, check out `HELP.md`.
+
+## Instructions
+
+Given a number, find the sum of all the unique multiples of particular numbers up to
+but not including that number.
+
+If we list all the natural numbers below 20 that are multiples of 3 or 5,
+we get 3, 5, 6, 9, 10, 12, 15, and 18.
+
+The sum of these multiples is 78.
+
+## Source
+
+### Created by
+
+- @gyssels
+
+### Contributed to by
+
+- @kchenery
+
+### Based on
+
+A variation on Problem 1 at Project Euler - http://projecteuler.net/problem=1

powershell/sum-of-multiples/SumOfMultiples.ps1

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+Function Get-SumOfMultiples {
+    <#
+    .SYNOPSIS
+    Given a number, find the sum of all the unique multiples of particular numbers up to
+    but not including that number.
+
+    .DESCRIPTION
+    If we list all the natural numbers below 20 that are multiples of 3 or 5,
+    we get 3, 5, 6, 9, 10, 12, 15, and 18.
+
+    .PARAMETER Multiples
+    An array of the factors 
+
+    .PARAMETER Limit
+    The value BELOW which we test for
+
+    .EXAMPLE
+    Get-SumOfMultiples -Multiples @(3, 5) -Limit 10
+    
+    Returns 23
+    #>
+    [CmdletBinding()]
+    Param(
+        [int[]]$Multiples,
+        [int]$Limit
+    )
+
+    $set = @{}
+    foreach ($Multiple in $Multiples) {
+        if ($Multiple -gt $Limit) { continue }
+        [int] $Maximum = [Math]::Floor($Limit / $Multiple)
+        if ($Multiple * $Maximum -ge $Limit) { $Maximum -= 1 }
+        1..$Maximum | % { $set[$_ * $Multiple] = $true }
+    }
+    return ($set.Keys | Measure-Object -Sum).Sum 
+}

powershell/sum-of-multiples/SumOfMultiples.tests.ps1

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+BeforeAll {
+    . ".\SumOfMultiples.ps1"
+}
+
+Describe "Get-SumOfMultiples Tests" {
+	It "Given the factors <Multiples> and to a limit of <Limit> the sum of multiples should be <ExpectedResult>" -TestCases @(
+		@{ Multiples = @(3, 5); Limit = 1; ExpectedResult = 0 },
+		@{ Multiples = @(3, 5); Limit = 4; ExpectedResult = 3 },
+		@{ Multiples = @(3); Limit = 7; ExpectedResult = 9 },
+		@{ Multiples = @(3, 5); Limit = 10; ExpectedResult = 23 },
+		@{ Multiples = @(3, 5); Limit = 100; ExpectedResult = 2318 },
+		@{ Multiples = @(3, 5); Limit = 1000; ExpectedResult = 233168 },
+		@{ Multiples = @(7, 13, 17); Limit = 20; ExpectedResult = 51 },
+		@{ Multiples = @(4, 6); Limit = 15; ExpectedResult = 30 },
+		@{ Multiples = @(5, 6, 8); Limit = 150; ExpectedResult = 4419 },
+		@{ Multiples = @(5, 25); Limit = 51; ExpectedResult = 275 },
+		@{ Multiples = @(43, 47); Limit = 10000; ExpectedResult = 2203160 },
+		@{ Multiples = @(1); Limit = 100; ExpectedResult = 4950 },
+		@{ Multiples = @(); Limit = 1000; ExpectedResult = 0 }
+	) {
+		Param(
+			[int[]]$Multiples,
+			[int]$Limit,
+			[int]$ExpectedResult
+		)
+
+		Get-SumOfMultiples -Multiples $Multiples -Limit $Limit | Should -BeExactly $ExpectedResult
+	}
+}