Mastering Windows PowerShell Scripting - Third Edition

Removing elements by value

Removing an element with a specific value from an array can be achieved in a number of different ways.

Again, we start with an array of 100 elements, as follows:

$oldArray = 1..100 

The Where object may be used to identify and omit the element with the value 50. If 50 were to occur more than once, all instances would be omitted:

$newArray = $oldArray | Where-Object { $_ -ne 50 } 

The index of the element might be identified and removed using the methods explored in removing elements according to the index:

$index = $oldArray.IndexOf(50) 

If the value of the variable index is -1, the value is not present in the array (0 would indicate that it is the first element):

$index = $oldArray.IndexOf(50) if ($index -gt -1) ...