Get last string from variable

Question

Using PowerShell, I created a script that other people will be using. Because of this, I am refactoring my code to use more variables. I have a variable named $endcol that will always be equal to the last string placed in another variable, $columnsToExtract. How can I make this work?

Right now my code is:

$columnsToExtract = '30', '31', '39'
$endcol = 39

@beatcracker: The pipeline is an elegant tool, but not always the right one, especially when it comes to performance: compare Measure-Command { 1..1e6 | Select-Object -Last 1 } to Measure-Command { (1..1e6)[-1] } — mklement0
– mklement0, Commented Mar 24, 2018 at 3:09
@mklement0 Yep, that's why it's a comment, not an answer. Should've mention performance issues, though. — beatcracker
– beatcracker, Commented Mar 24, 2018 at 11:20

Olaf · Accepted Answer · 2018-03-23 22:20:12Z

1

To get always the last element of an array you can use the "negativ index" starting with -1. Like this:

$columnsToExtract = '30', '31', '39'
$endcol = $columnsToExtract[-1]

answered Mar 23, 2018 at 22:20

Olaf

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DKU · Accepted Answer · 2018-03-23 21:50:37Z

-1

$columntoextract = '30','31','39'
$endcol = $($columntoextract[2])
$endcol

answered Mar 23, 2018 at 21:50

DKU

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1 Comment

Olaf Over a year ago

What is when the array has less or more than 3 elements? ;-)

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