VB - Resizing an Array with Redim

Anyone who has learned VB has surely come across the Dim syntax, right?

It declares a variable (an array) and tells the computer to set aside a block of space for the program.

But sometimes you don’t know how many items an array will hold.

So setting its size to something huge is a waste.

Today’s topic, Redim, is a statement that lets you reset an array’s size.

Syntax:

Redim ArrayName(Size)

Example:

Module Module1

    Sub Main()
        Dim X(10)
        Console.WriteLine("Redim前x陣列的寬度" & X.Length)
        Console.Write("設定x陣列的寬度:")
        Dim y As Integer = Console.ReadLine() - 1
        ReDim X(y)
        Console.WriteLine("Redim之後x陣列的寬度" & X.Length)
        Console.ReadLine()

    End Sub

End Module

Note:

In the example above, array x is first declared as “unlimited,” and then reset to 10 (its size).