Why does this function returns '' instead of a concatenated string

Question

I have numerous fields to quote or double quote depending on the cases, so I have made a functions to do that.

Namely

function Add-SingleQuotes 
{  
    param([string] $input)

    $str_return = "'" + $input + "'" 
    return $str_return
}

However the result of this function is '', whatever the input I give. Why is it so ?

On the contrary, if I enter manually "'" + "4" + "'" the result is indeed '4'.

Lieven Keersmaekers · Accepted Answer · 2014-10-13 10:48:00Z

3

$input seems to be a reserved word but I can't find a reference to it that makes sense to me.

Changing it to $inp works for me.

answered Oct 13, 2014 at 10:48

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Comments

iRon · Accepted Answer · 2014-10-13 17:22:27Z

1

$Input is indeed reserved and holds the object(s) in the pipeline. This is how you might use the $Input variable in your script:

function Add-SingleQuotes {  
    return "'" + $input + "'"
}

4 | Add-SingleQuotes

Which results into '4'

answered Oct 13, 2014 at 17:22

iRon

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