For updating the value of a map given a key you can use update-in:

user> (update-in {1 [11]} [1] conj 22)
{1 [11 22]}

Now, to handle the case when the key is not present, you can use fnil:

user> (update-in {} [1] (fnil conj []) 22)
{1 [22]}
​
Cheers,
Mauricio

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