How to compare two arrays of string?

Question

I want to compare two string arrays. I don\'t know how to implement this in vb.net.

Let\'s say I have two arrays

Dim A() As String = {\"Hello\", \"H         


        

Answer 1

Set up a for loop and use .equals to compare each string at each element in the arrays. I can write the code if you need it.

Answer 2

Use Linq extensions. Except will tell you which items are different

' ones in A but not in B
Dim result() As String = A.Except(B).ToArray()

' ones in B but not in A
Dim result() As String = B.Except(A).ToArray()

And you can use Join to find same items

Here is One method to find same items, or different items

Dim a() as string = {"a", "b", "c"}
Dim b() as string = {"a", "b", "z"}

Dim sameItems() as String = a.Where(Function(i) b.Contains(i)).ToArray()
Array.ForEach(sameItems, Sub(i) Console.WriteLine(i))    

Dim diffItems() as String = a.Where(Function(i) Not b.Contains(i)).ToArray()
Array.foreach(diffItems, Sub(i) Console.WriteLine(i))    

And of course, you can use Intersect

Answer 3

With Linq use Except() to find the differences between the two arrays and Intersect() to find which elements are in both arrays.

Imports System.Linq

Module Module1
    Sub Main()
        Dim A() As String = {"Hello", "How", "Are", "You?"}
        Dim B() As String = {"You", "How", "Something Else", "You"}

        Console.WriteLine("A elements not in B: " + String.Join(", ", A.Except(B)))
        Console.WriteLine("B elements not in A: " + String.Join(", ", B.Except(A)))
        Console.WriteLine("Elements in both A & B: " + String.Join(", ", A.Intersect(B)))

        Console.ReadLine()
    End Sub
End Module

Results:

A elements not in B: Hello, Are, You?
B elements not in A: You, Something Else
Elements in both A & B: How