How to get sub-array from larger array in VB.NET?

Question

I have:

Dim arr() As String = {\"one\",\"two\",\"three\"}

I want a new array, sub, containing {\"one\", \"three\"} only. What

Answer 1

It's a little difficult to see what you want exactly, but something like this will work.

Dim arr() As String = {"one","two","three"}

Dim templist As New List(Of String)(arr)
templist.RemoveAt(1)
Dim sub() As String = templist.ToArray()

Personally, I'd be using List rather than String() if you want to make frequent changes like this.

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EDIT: Considering RPK's comment below:

Function RemoveElements(ByVal arr() As String, ByVal ParamArray skip() As Integer) As String()
    Dim templist As New List(Of String)(arr.Length - skip.Length)
    For i As Integer = 0 to templist.Length - 1
        if Array.IndexOf(skip, i) = -1 Then templist.Add(arr(i))
    Next i
    Return templist.ToArray()
End Function

You can call this for a single element:

' Skips the second element.
Dim sub() As String = RemoveElements(arr, 1)

or with as many elements as you like:

' Skips the second, fourth, seventh and eleventh elements.
Dim sub() As String = RemoveElements(arr, 1, 3, 6, 10)

or with an array:

' Skips the second, fourth, seventh and eleventh elements.
Dim skip() As Integer = {1, 3, 6, 10}
Dim sub() As String = RemoveElements(arr, skip)

Note, this is slow code, but it can make your code easier to read and maintain.