![]() ![]() In order to implement this behaviour in our classes so they can use the For Each… Next schema, the real work is in the Iterator Class Interface. Wouldn’t it be great to extend this behaviour to other classes, making them more flexible? The key to doing just that is in two of Xojo’s Class Interfaces: Iterator and Iterable.ĭownload the example project used in this tutorial. The second difference is that the iterator will be invalid when the iterated elements are modified or when we modify the number of elements in the collection during the iteration process.īy default in Xojo, there are a couple of collections that are iterable: Arrays, Dictionaries and FolderItem.Children. The first difference is that with For Each… Next we can’t assume that we are iterating the items in the collection in order, as is the case when using the variable of the conventional For… Next. What are the main differences when comparing For Each… Next with the conventional For… Next? To do this in Xojo, use the commands For Each… Next. In programming, iterators are the mechanisms that run through all the items of a collection without needing to know in advance how many items compose that collection. This blog post was originally written by Javier Menendez in 2017 and has been updated for Xojo API 2.0 by Wayne Golding.
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