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Iterating through a map using for loops

In Apex, you cannot directly loop through a map using a for loop. Instead, you can iterate through the map by accessing its keys or values as a collection.

Using Keyset

You can get the keys of a map using the keySet() method. The keysSet() method returns a collection that contains all the keys of the map.

Using Values

Alternatively, use the values() method to retrieve all the values from the map as a collection Then, iterate through the collection using a for loop to process the individual records.

Following is an example of iterating through a map using its keys:

In the above example:

The variable allContactsMap contains the first 200 contact records from salesforce.
The keyset() method is used to return all keys from the map.
The for loop iterates through all the keys and individual contact record is accessed using the map get() method.

Try It Yourself

Execute

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