Read-only and constant variables

On occasion, you might want to use read-only or constant variables in your code. This recipe will show you how to create variables with specific options, such as read-only or constant, and why you would use those. You will also see some important automatic variables that are, incidentally, also constants.

How to do it...

Install and start PowerShell Core and execute the following steps:

1. Try to execute the following code block:

$true = $false
$pid = 0
$Error = "I don't make mistakes!"

2. Execute the next cmdlet to see why Step 1 didn't work as intended:

Get-Variable | Where-Object -Property Options -like *Constant*

3. You can create your own read-only and constant variables...