Question

I know that an ArrayCollection is a wrapper over an Array, but what I wanted to know is when to choose one over the other? Will the over usage of ArrayCollections result in performance?

Answer 1

The main advantage of ArrayCollection is collectionChange event which allows to get advantage of data binding with it.

Some others are:

• Possibility to filter or sort elements of collection without modifying or copying of underlying array.
• Implementation of ICollectionView which allows to create a cursor and iterate collection with it.
• Display of multiple arrays in a datagrid / etc (in this case, arrays are automatically converted to arrayCollections anyway)

If you don’t need any of these advantages use simple Array.