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While the last three iterating options are more intuitive, and also vary with regards to performance and usage, the foundset iterator is the most recommended to be used since it is the only option that ensures iterating over all the records of the foundset, not without missing any of them due to the multiple clients performing changes on the same foundset at the same time.
It is also possible to use JSFoundsetUpdater API to iterate over and update a foundset, though iterating is not its main goal.
Using the Foundset Iterator
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