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Write map method for PowerShell
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‎WriteMapForPowerShell/ConvertTo-Range.Tests.ps1‎

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<#
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.NOTES
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===========================================================================
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Created with: SAPIEN Technologies, Inc., PowerShell Studio 2017 v5.4.135
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Created on: 2/21/2017 9:31 PM
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Created by: June Blender
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Organization: SAPIEN Technologies, Inc.
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Filename:
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===========================================================================
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.DESCRIPTION
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A description of the file.
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#>
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$directory = Split-Path -Parent $MyInvocation.MyCommand.Path
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$script = (Split-Path -Leaf $MyInvocation.MyCommand.Path).Replace(".Tests.", ".")
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. "$directory\$script"
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Describe "ConvertTo-Range" {
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Context "SmallToLarge_StandardValues" {
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It "Mid-range test" {
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# map(60, 40, 90, 0, 255) is 102.0
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ConvertTo-Range -Value 60 -Range1_Start 40 -Range1_End 90 -Range2_Start 0 -Range2_End 255 | Should Be 102
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}
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It "Min-range test" {
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# map(40, 40, 90, 0, 255) is 0
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ConvertTo-Range -Value 40 -Range1_Start 40 -Range1_End 90 -Range2_Start 0 -Range2_End 255 | Should Be 0
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}
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It "Max-range test" {
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# map(90, 40, 90, 0, 255) is 255
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ConvertTo-Range -Value 90 -Range1_Start 40 -Range1_End 90 -Range2_Start 0 -Range2_End 255 | Should Be 255
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}
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}
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Context "LargeToSmall_StandardValues" {
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It "Mid-range test" {
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# map(60, 10, 500, 40, 90) is 45
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ConvertTo-Range -Value 60 -Range1_Start 10 -Range1_End 500 -Range2_Start 40 -Range2_End 90 | Should Be 45
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}
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It "Min-range test" {
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# map(250, 10, 500, 40, 90) is 64
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ConvertTo-Range -Value 250 -Range1_Start 10 -Range1_End 500 -Range2_Start 40 -Range2_End 90 | Should Be 64
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}
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It "Max-range test" {
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# map(450, 10, 500, 40, 90) is 84
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ConvertTo-Range -Value 450 -Range1_Start 10 -Range1_End 500 -Range2_Start 40 -Range2_End 90 | Should Be 85
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}
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}
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Context "SmallToLarge_OutOfRange" {
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It "Mid-range test" {
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# map(30, 40, 90, 0, 100) is -20
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ConvertTo-Range -Value 30 -Range1_Start 40 -Range1_End 90 -Range2_Start 0 -Range2_End 100 | Should Be -20
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}
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It "Min-range test" {
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# map(100, 40, 90, 0, 255) is 306
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ConvertTo-Range -Value 100 -Range1_Start 40 -Range1_End 90 -Range2_Start 0 -Range2_End 255 | Should Be 306
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}
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It "Max-range test" {
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# map(300, 40, 90, 0, 255) is 1326
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ConvertTo-Range -Value 300 -Range1_Start 40 -Range1_End 90 -Range2_Start 0 -Range2_End 255 | Should Be 1326
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}
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}
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Context "FunStuff" {
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It "Negative_Range1" {
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# map(-80, -90, -40, 0, 255) is 51
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ConvertTo-Range -Value -80 -Range1_Start -90 -Range1_End -40 -Range2_Start 0 -Range2_End 255 | Should Be 51
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}
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It "Negative_Range2" {
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# map(80, 40, 90, -100, -10) is -28
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ConvertTo-Range -Value 80 -Range1_Start 40 -Range1_End 90 -Range2_Start -100 -Range2_End -10 | Should Be -28
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}
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It "Temperatures: F->C" {
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# map(68, 32, 212, 0, 100) is 20
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ConvertTo-Range -Value 68 -Range1_Start 32 -Range1_End 212 -Range2_Start 0 -Range2_End 100 | Should Be 20
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}
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It "Temperatures: C->F" {
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# map(30, 0, 100, 32, 212) is 86
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ConvertTo-Range -Value 30 -Range1_Start 0 -Range1_End 100 -Range2_Start 32 -Range2_End 212 | Should Be 86
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}
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It "Min > Max Range" {
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# map(60, 90, 40, 0, 255) is 153
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ConvertTo-Range -Value 60 -Range1_Start 90 -Range1_End 40 -Range2_Start 0 -Range2_End 255 | Should Be 153
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}
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It "won't work" {
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# map(40, 40, 40, 0, 100) is NaN
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{ ConvertTo-Range -Value 40 -Range1_Start 40 -Range1_End 40 -Range2_Start 0 -Range2_End 100 } | Should Throw
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}
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}
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}

‎WriteMapForPowerShell/ConvertTo-Range.ps1‎

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<#
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.NOTES
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===========================================================================
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SAPIEN Friday PowerShell Puzzle, February 24, 2017
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Created with: SAPIEN Technologies, Inc., PowerShell Studio 2017 v5.4.136
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Created on: 2/24/2017 4:43 PM
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Created by: June Blender
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Organization: SAPIEN Technologies, Inc
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Filename: ConvertTo-Range.ps1
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===========================================================================
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#>
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<#
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.SYNOPSIS
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Converts a value from its current range to a target range.
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.DESCRIPTION
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ConvertTo-Range converts a value from its position in a current range to the same relative position in a target range.
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This function takes a current range (range 1), a target range (range 2), and a value in the current range. It returns the equivalent value in the target range.
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For example, if the current range is 0-10, the target range is 20-30, and the value is 5, it returns 25, which is the equivalent value in the 20-30 range.
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.PARAMETER Value
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Specifies the integer value to be converted from the current range to the target range.
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Although this value is evaluated based on its position in the current range, it can be any value, including a value outside of the current range and the target range.
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.PARAMETER Range1_Start
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Specifies the starting value in the current range. Enter an integer value. The value of Range1_Start can be less than or greater than the value of Range1_End.
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.PARAMETER Range1_End
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Specifies the ending value in the current range. Enter an integer value. The value of Range1_End can be less than or greater than the value of Range1_Start.
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.PARAMETER Range2_Start
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Specifies the starting value in the target range. Enter an integer value. The value of Range2_Start can be less than or greater than the value of Range2_End.
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.PARAMETER Range2_End
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Specifies the ending value in the target range. Enter an integer value. The value of Range2_End can be less than or greater than the value of Range2_Start.
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.EXAMPLE
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PS C:\> ConvertTo-Range -Value 40 -Range1_Start 40 -Range1_End 90 -Range2_Start 0 -Range2_End 100
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0
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This command maps the range 40-90 to the range 0-100. Then, given a value of 40 in the first range, it returns 0, the equivalent value in the second range.
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.EXAMPLE
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PS C:\> ConvertTo-Range -Value 300 -Range1_Start 40 -Range1_End 90 -Range2_Start 0 -Range2_End 100
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520
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This command demonstrates that the test value does not need to be within the starting or the target range. The resulting value in the target range is proportional to the input value in the current range.
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.NOTES
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Based on the map() method in the Java Processing library
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https://processing.org/reference/map_.html
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Thanks to Andy Cahn at Chrysalis Schools for the math help.
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#>
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function ConvertTo-Range
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{
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# Your solution goes here
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}

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