Maps keySet is a collection that supports remove() but is otherwise read-only – salesforce.stackexchange.com

Maps keySet is a collection that supports remove() but is otherwise read-only – salesforce.stackexchange.com

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I've run into an oddity with Sets that reference a Maps keySet. It appears you can remove a value from that Set and it will remove the record from the corresponding Map. Yet if you try and add ...

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