Traversing an array

Traversing an array is the process of working through an array one index at a time, either to input data to it, output data from it, or read data from it.

The process must use a loop but it can be either fixed or conditional.

The UBound function is extremely useful here as a way of checking when the last index is reached.

Example code – output from an array using a fixed loop show

VB code
`For counter = 0 to 49 lstOutput.Items.Add songs(counter) Next counter`

Example code – output from an array using a fixed loop and UBound show

This example assumes we have an array called songs (of unknown size) and a ListBox called lstOutput.
Using UBound is always a good idea since it generalises your code (i.e. makes it more easily usable in other situations, not just this one).

VB code
`For counter = 0 to UBound(songs) lstOutput.Items.Add songs(counter) Next counter`

Example code – output from an array using a conditional loop show

VB code
`Dim counter As Integer = 0 Do lstOutput.Items.Add songs(counter) counter = counter + 1 Loop Until counter>UBound(songs)`

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mph@ghscomputing.co.uk

Updated 09 December 2018