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Azure – PowerShell 5.1 What's the difference between inline function and all the other ones?

I’m using PowerShell 5.1 and I’m using inline functions just fine in my script. But I can’t find anything online telling me why I wouldn’t use inline functions. My main context is using Azure pipeline tasks to call my PowerShell scripts.

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2

Answers


  1. 0

    function-inline is a snippet for a function where the parameters are defined inline with the function name rather than in a parameter block.

    The function-inline creates:

    function FunctionName (OptionalParameters) {
    
}

    Whereas a function is:

    function FunctionName {
    param (
        OptionalParameters
    )
    
}

    The different location of OptionalParameters is the only difference.

    IMX, parameter blocks are typically preferred for all but the most trivial of functions.

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  2. 0

    Bacon Bits helpful answer already shows the basic syntactic difference.

    A major difference is that you can’t use the CmdletBinding attribute with inline functions.

    Somewhat surprisingly, you can write advanced functions as both inline and non-inline functions:

    # Advanced function using inline syntax:
function InlineFun( [Parameter()] $a ) { 
    $PSCmdlet 
}

# Advanced function using non-inline syntax:
function Fun {
    param( [Parameter()] $a ) 
    $PSCmdlet 
}

    A function becomes an advanced one if it either has CmdletBinding() or at least one Parameter() attribute. As proof the functions output the automatic $PSCmdlet variable, which is only available to advanced functions.

    One case where you actually need the param() block is when you want to write a parameter-less advanced function:

    function Fun {
    [CmdletBinding()] param() 
    $PSCmdlet 
}

    In this case you need to use the CmdletBinding() attribute, which can’t be used with an inline function because it is an attribute of the param() block.

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