Visual Basic - Objects - Collections
PropertiesMethods

An alternative to Arrays
VB4: not Controls - >Control Array

Collections - Properties: Count

Count

The number of items (elements) in the collection.
Acts like the Ubound() function of an Array
> ListBox.ListCount
> Ex: Remove

Collections - Methods: Add, Remove, Item

Add

Put new member into a Collection object

Collection.Add Item, [Key], [Before], [After]

Item:= The new member Key:= A text label used to identify the item (the numeric index may also be used for identification) Before:= Where to add the item - Index number (1..Count) or text label After:= Where to add the item

Dim MyNames as New Collection For i = 1 To 20   MyNames.Add "Name" & i, "Key#" & i Next Print MyNames(3) Print MyNames("Key#4")

 

Remove

Take member out of Collection

Collection.Remove Index | Key

Index:= A numeric expression Key:= A string expression evaluating to a text label

Dim MyNames as New Collection ' Remove all elements (1) For i = 1 To MyNames.Count   MyNames.Remove 1 'the element index is adjusted after removal Next

Dim MyNames as New Collection ' Remove all elements (2) For Each x in MyNames   MyNames.Remove 1 Next

 

Item

Returns a specific member of a collection, either by position or by key.
The default method for a Collection.

Collection.Item(index)

index:= A numeric (1..Count) or string (a Key label) expression

Dim Things As New Collection --- Print Things.Item(3) Print Things(4) '.Item is default method