Understanding using Scriptblocks in PowerShell

sample.ps1

#Download the sample_script.ps1 contents included in this gist
$url = 'https://gist.githubusercontent.com/steviecoaster/027d2e53b79e200ffb2455f74e2f1308/raw//sample_script.ps1'
$scriptData = [System.Net.WebClient]::new().DownloadString($url)

<#
  The above uses the [System.Net.WebClient] .Net class directly, however you can use New-Object if you are more comfortable:
  (New-Object System.Net.WebClient).DownloadString('https://gist.githubusercontent.com/steviecoaster/027d2e53b79e200ffb2455f74e2f1308/raw/3bc513de7c664915691b6bbd78c49649069f52c5/sample_script.ps1')
#>

# Next, we create our script block, and fill it with our $scriptData
$scriptBlock = [Scriptblock]::Create($scriptData)

# Now that we have our scriptblock, we can execute it, but first let's define those parameters it can accept
# We'll define them as a hashtable so we can use splatting to provide them to our scriptblock
# See Get-Help about_Splatting forr more info about splatting.NOTE: You may need to run Update-Help first
$scriptParameters = @{
  FirstName = 'Stephen'
  BlueskyHandle = '@steviecoaster.dev'
  }
  
  # Let's execute our script block. We do that with the PowerShell call (&) operator.
  # Go ahead and give it a try! 
  & $scriptblock @scriptParameters
  

sample_script.ps1

[CmdletBinding()]
Param(
  [Parameter()]
  [String]
  $FirstName,
  
  [Parameter()]
  [String]
  $BlueskyHandle
)
  
end {
  Write-Host 'Scriptblocks are so cool!'
  [pscustomobject]@{
    FirstName     = $FirstName
    BlueskyHandle = $BlueSkyHandle
  }
}