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Trigger.oldMap

Learn Trigger.oldMap in Apex with a construct-specific explanation, a unique example, a practical boundary, and a mastery check.

12 min read • Intermediate

Trigger.oldMap is an atomic Apex topic inside Triggers. The example below uses the actual construct named by the lesson rather than a generic placeholder.

Focus on what Trigger.oldMap changes: the input, binding, control path, object state, collection, runtime effect, or language contract. Then alter one value and verify that the behavior changes for a reason specific to this feature.

Topic-specific example

apex-05-08-trigger-oldmap.cls
apex Try It Live
trigger OppTrigger on Opportunity (after update) { Opportunity oldOpp=Trigger.oldMap.get(Trigger.new[0].Id); }
Edge case / engineering note

Check the input collection shape, whether the operation mutates or returns a new value, and what happens for an empty collection.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content