A function is a block of statements that have a name that you assign for easy re-use.
A function includes the following items:
- Function keyword
- Scope (optional)
- Name
- Parameters (optional)
- PowerShell commands enclosed in braces ({})
Functions can return values that can be displayed, assigned to variables, or passed to other functions or cmdlets.
A simple function
function hello-world { write-host "hello world" }
You can pass parameters in a function using param keyword
function Get-Result { Param ([int]$a,[int]$b) $c = $a * $b Write-Output $c }
You can call a function using its name like
hello-world
and if a function is taking some parameters type
Get-Result -a 5 -b 10
To define a default value for a parameter, type an equal sign and the value after the parameter name.
Function Scope
A function exists in the scope in which it was created. When a function is in the global scope, you can use the function in scripts, in functions, and at the command line.
function global:hello-world { write-host "hello world" }