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Apex Design Patterns by Anshul Verma, Jitendra Zaa

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The iterator pattern

Developers of Universal Call Center are given the task of displaying a customer banner on the service cloud. This banner should display the account name and ticker symbol of a customer. This functionality needs to be reusable so the team decides to use a newly launched Salesforce lightning platform to create a banner component. An expected requirement is to display one account at a time. Team discussed an approach to retrieve all the required accounts and display them in a sequence. However, as this would result in lots of records being stored in the browser memory, this solution is not memory-efficient. So, the team identifies that they need a solution wherein they can retrieve one account at a time.

The iterator pattern ...

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