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https://ss64.com/ps/syntax-functions.html

https://docs.microsoft.com/en-us/powershell/scripting/learn/ps101/09-functions?view=powershell-7

Note: When calling a PS1 script, it is read top-down and functions must be at the TOP.

https://stackoverflow.com/a/17347721/5079799

function Add-Numbers {
 $args[0] + $args[1]
}
<ApprovedVerb>-<Prefix><SingularNoun>
function Test-DoesFileExistBool {
    param (
        [ValidateSet(“Tom”,”Dick”,”Jane”)]
        [String]
        $Name
    )
    Test-Path $FilePath 2> $null
}
$FExistBool = Test-DoesFileExistBool -FilePath $FilePath
function Compare-IsBoolTrue {
    param (
        [string[]]$TFBool
    )
    IF ($TFBool -eq "True") {
     Write-Host "File Found"
    } ELSE {
     Write-Host "File NOT Found"
    }
}
Compare-IsBoolTrue -TFBool $FExistBool
Compare-IsBoolTrue -TFBool TRUE
function Output-SalesTax {
 param( [int]$Price, [int]$Tax )
 $Price + $Tax
}

#$result = Add-Numbers (5, 10) --Wrong!
$result = Output-SalesTax 5 10    #--Right

echo $result
#15
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----        -----
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