Get-ModuleSynopsis - Lists all available functions for a module, with the synopsis of those functions.

Get-ModuleSynopsis.ps1

<#
.SYNOPSIS
Lists all available functions for a module, with the synopsis of the functions.

.DESCRIPTION
Lists all available functions of a module using Get-Command and Get-Help.

.PARAMETERS 
    Name <String> The name of the module installed.

.INPUTS
None

.OUTPUTS
PSCustomObject

.EXAMPLE
E:\> Get-ModuleSynopsis Microsoft.PowerShell.Utility

Name                      Synopsis
----                      --------
ConvertFrom-SddlString
Format-Hex                Displays a file or other input as hexadecimal.
Get-FileHash              Computes the hash value for a file by using a specified hash algorithm.
Import-PowerShellDataFile
New-Guid                  Creates a GUID.
New-TemporaryFile         Creates a temporary file.
Add-Member                Adds custom properties and methods to an instance of a Windows PowerShell object.
Add-Type                  Adds a.NET Framework type (a class) to a Windows PowerShell session.
#>
function Get-ModuleSynopsis 
{
    [CmdletBinding(PositionalBinding=$False)]
    Param(
        # Any other parameters can go here
    )
 
    DynamicParam {
            # Set the dynamic parameters' name
            $ParameterName = 'Name'
            
            # Create the dictionary 
            $RuntimeParameterDictionary = New-Object System.Management.Automation.RuntimeDefinedParameterDictionary

            # Create the collection of attributes
            $AttributeCollection = New-Object System.Collections.ObjectModel.Collection[System.Attribute]
            
            # Create and set the parameters' attributes
            $ParameterAttribute = New-Object System.Management.Automation.ParameterAttribute
            $ParameterAttribute.Mandatory = $True
            $ParameterAttribute.Position = 0

            # Add the attributes to the attributes collection
            $AttributeCollection.Add($ParameterAttribute)

            # Generate and set the ValidateSets 
            $NonInstalledSet = Get-Module | Select-Object -ExpandProperty Name
            $InstalledSet = Get-InstalledModule | Select-Object -ExpandProperty Name
            
            $ValidateSetAttribute = New-Object System.Management.Automation.ValidateSetAttribute($NonInstalledSet + $InstalledSet)

            # Add the ValidateSet to the attributes collection
            $AttributeCollection.Add($ValidateSetAttribute)

            # Create and return the dynamic parameter
            $RuntimeParameter = New-Object System.Management.Automation.RuntimeDefinedParameter($ParameterName, [string], $AttributeCollection)
            $RuntimeParameterDictionary.Add($ParameterName, $RuntimeParameter)
            return $RuntimeParameterDictionary
    }

    begin {
        # Bind the parameter to a friendly variable
        $Name = $PsBoundParameters[$ParameterName]
    }

    process {
         Get-Command -Module $Name | Foreach-Object {
             $Syno = Get-Help -Name $_.Name | Select-Object -ExpandProperty Synopsis

             [PSCustomObject]@{
                 Name = $_.Name
                 Synopsis = $Syno }
         }
    }
}