Power$nippets

The Join-Object (Join.ps1) script can be installed from the PowerShell Gallery:

Install-Script -Name Join

As it concerns a standalone script, installation isn't really required. If you don't have administrator rights, you might just download the script (or copy it) to the required location. You might than simply invoke the script using PowerShell dot sourcing:

. .\Join.ps1

For source code versions, testers history etc., see the Join-Object project site on GitHub.