Interface

Iterable


Description

The Iterable interface allows objects to denote themselves as being able to be used with “For Each” loops and provides a way to create Iterators, which do the actual work.

Methods

Name

Parameters

Returns

Shared

Iterator

Iterator

Method descriptions


Iterable.Iterator

Iterator As Iterator

Returns an Iterator that can be used with For Each…Next loops.

Classes that implement Iterable, such as Dictionary, can be used with For..Each loops:

Var entries() As DictionaryEntry
For Each entry As DictionaryEntry In entries
  TextArea1.Text = TextArea1.Text + " " + entry.Key + " " + entry.Value
Next

Note that if you change an Iterable while iterating over it using For Each…Next, an exception is raised. If you find you need to iterate and change the data, you can add a method to get all the keys into an array and then iterate through the array to access the values. A method could be something like this:

Function EagerlyEvaluateIterable(obj As Iterable) As Variant()
  Var results() As Variant
  For Each item As Variant In obj
    results.Add(item)
  Next
  Return results
End Function

Now you can call the method to get an array where you can then modify the contents. For example. this would let you iterate and modify a Dictionary:

For Each entry As DictionaryEntry In EagerlyEvaluateIterable(d)
  // Stuff that can mutate the dictionary
Next

You can also use FolderItem.Children to loop through the files in a folder:

Var docs As FolderItem
docs = Special.Folder.Documents

Var files() As String
For Each f As FolderItem In docs.Children
  files.Add(f.Name)
Next

Compatibility

All projects types on all supported operating systems.

See also

Iterator interface