Mastering Windows PowerShell Scripting - Third Edition

Removing elements by index

Removing elements based on an index requires the creation of a new array and omission of the value in the element in that index. In each of the following cases, an array with 100 elements will be used as an example; the element at index 49 (with the value of 50) will be removed:

$oldArray = 1..100 

This method uses indexes to access and add everything we want to keep:

$newArray = $oldArray[0..48] + $oldArray[50..99] 

Using the .NET Array.Copy static method (see Chapter 7, Working with .NET), we have the following:

$newArray = New-Object Object[] ($oldArray.Count - 1) 
# Before the index 
[Array]::Copy(    $oldArray,    # Source 
    $newArray,    # Destination 
    49            # Number of elements to copy )
# After the index 
[Array]::Copy(