Learn PowerShell Core 6.0

Function declaration

Decorating a script block with the function keyword and a name is, at first, the only thing that makes a function. Adding your functions to a module will enable you to package them, version them, and ship them as a single unit.

While you can certainly create functions in your code dynamically, it is not recommended. There is no good reason to not create a proper function declaration:

# Using the function PSDrive, create a new function in your codeNew-Item -Path function:\MyFunction -Value {param($Id) Get-Process -Id $Id}MyFunction -id $pid& (Get-Item Function:\MyFunction) -id $pid

Consider the following code. You should be able to immediately spot why using a function might be the best option here:

# The legacy code