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in Salesforce by (29.3k points)

why do we use maps in triggers instead of lists ? please help with few examples advantage of using maps.

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You can directly use the Map for getting any record. You don't need 2nd for a loop.
1) When moving line items from one opportunity to other opportunities we need to use the map
2) to determine whether an old value is changed or not in a trigger we need to use the map

You can learn more about Triggers In Salesforce.

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