Get ValueFromRemainingArguments as an hashtable

Question

Using [parameter(ValueFromRemainingArguments=$true)] one can get all the remaining arguments passed to the function into a variable as a list.

How can I get the remaining arguments as a hashtable type, for example for inputs like Function -var1 value1 -var2 value2?

Answer 1

There are multiple ways to achieve this. The following solution supports parameters with:

• Simple value (single item)
• Array value
• Null value (switch)
• Colon syntax

Script:

function Get-Demo {
    param(
        $name = 'Frode',
        [parameter(ValueFromRemainingArguments = $true)]
        $vars
    )

    "Name: $name"
    "Vars count: $($vars.count)"
    'Htvars:'

    #Convert vars to ordered dictionary
    $htvars = [ordered]@{}
    $vars | ForEach-Object {
        if ($_ -match '^-(?<param>[^:]+):?$') {
            #New parameter
            $lastvar = $matches['param']
            $htvars[$lastvar] = $true # Default value for switch
        } else {
            # Update value to next argument
            $htvars[$lastvar] = $_
        }
    }

    #Return hashtable
    $htvars

}

Get-Demo -simplepar value1 -arraypar value2, value3  -colonParam:'hello world' -scriptblockParam { 'demo' } -switchpar -switchpar2:$false

Output:

Name: Frode
Vars count: 11
Htvars:

Name                           Value
----                           -----
simplepar                      value1
arraypar                       {value2, value3}
colonParam                     hello world
scriptblockParam                'demo'
switchpar                      True
switchpar2                     False