This is where beginners get stuck and even experienced users hit Google, Facebook, or a PowerShell forum for help. Remove fails, because object arrays are a fixed size. This command reveals that object arrays, like the one in the $letters variable have a Remove method.
To get the members of the collection (not the objects that it contains), use its InputObject parameter. But, when you pipe a collection of objects to Get-Member, Get-Member gets the members of objects in the collection. Typically, to get the type, methods, and properties of an object, you pipe it to the Get-Member cmdlet. Let’s find the methods that System.Object supports. That didn’t work, because object arrays ) don’t have a subtraction (op_Subtraction) method. + CategoryInfo : InvalidOperation: (op_Subtraction:String), RuntimeException Method invocation failed because ] does not contain a method named ‘op_Subtraction’. Now, I’ll try to remove the “c” from the array. I’ll create an array called $letters and save a few letters in the array. You can change objects in the array, but you can’t add or delete them, because that would change the size of the array.
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Removing objects from arrays should be simple, but the default collection type in Windows PowerShell, an object array (System.Object), has a fixed size. But that answer was incomplete, and while there are many good posts on the topic, none really cover the whole scope of pitfalls.
When I first answered this question in about_Arrays, I didn’t really know much about the subject and I used the (very good) answer that the team gave me. It’s one of those beginner questions that has an advanced answer. It’s a simple question, but the answer isn’t very simple at all.
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A member of the PowerShell group on Facebook asked how to delete an object from an array.
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